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description Publicationkeyboard_double_arrow_right Research , Article , Other literature type , Preprint 2019 France, Germany, France, SwitzerlandPublisher:Copernicus GmbH Funded by:SNSF | Glacial Hazard Monitoring...SNSF| Glacial Hazard Monitoring with Seismology (GlaHMSeis)Authors: Fabian Lindner; Fabian Walter; Gabi Laske; Florent Gimbert;Fabian Lindner; Fabian Walter; Gabi Laske; Florent Gimbert;Hydraulic processes impact viscous and brittle ice deformation. Water-driven fracturing as well as turbulent waterflow within and beneath glaciers radiate seismic waves which provide insights into otherwise hard-to-access englacial and subglacial environments. In this study, we analyze glaciohydraulic tremors recorded by four seismic arrays installed in different parts of Glacier de la Plaine Morte, Switzerland. Data were recorded during the 2016 melt season including the sudden subglacial drainage of an ice-marginal lake. Together with our seismic data, discharge, lake level, and ice flow measurements provide constraints on glacier hydraulics. We find that the tremors are generated by subglacial water flow, in moulins, and byicequake bursts. The dominating process can vary on sub-kilometer and sub-daily scales. Consistent with field observations,continuous source tracking via matched-field processing suggests a gradual upglacier progression of an efficient drainage sys-tem as the melt season progresses. The ice-marginal lake likely connects to this drainage system via hydrofracturing, whichis indicated by sustained icequake signals emitted from the proximity of the lake basin and starting roughly 24 hours prior to the lake drainage. To estimate the hydraulics associated with the drainage, we use tremor-discharge scaling relationships. Our analysis suggests a pressurization of the subglacial environment at the drainage onset, followed by an increase in the hydraulicradii of the conduits and a subsequent decrease in the subglacial water pressure as the capacity of the drainage system increases.The pressurization is in phase with the drop in the lake level and its retrieved maximum coincides with ice-uplift measured via GPS. Our results highlight the use of cryo-seismology for monitoring glacier hydraulics The Cryosphere Discussions ISSN:1994-0440 ISSN:1994-0432
The Cryosphere arrow_drop_down GFZ German Research Centre for GeosciencesArticle . 2020Data sources: GFZ German Research Centre for Geosciencesadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.5194/tc-2019-155&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.euAccess RoutesGreen gold 0 citations 0 popularity Average influence Average impulse Average Powered by BIP!more_vert The Cryosphere arrow_drop_down GFZ German Research Centre for GeosciencesArticle . 2020Data sources: GFZ German Research Centre for Geosciencesadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.5194/tc-2019-155&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Conference object , Research 2007 France EnglishAuthors: Longdoz, Bernard,;Longdoz, Bernard,;ProdInra arrow_drop_down Mémoires en Sciences de l'Information et de la Communication; Hal-DiderotConference object . 2007Full-Text: https://hal.inrae.fr/hal-02814185/documentAll Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=od_______212::79336ec32894910b5843fd0678c634be&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eu0 citations 0 popularity Average influence Average impulse Average Powered by BIP!more_vert ProdInra arrow_drop_down Mémoires en Sciences de l'Information et de la Communication; Hal-DiderotConference object . 2007Full-Text: https://hal.inrae.fr/hal-02814185/documentAll Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=od_______212::79336ec32894910b5843fd0678c634be&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Article , Research , Other literature type 2008 France, France, GermanyPublisher:Copernicus GmbH Mona Vetter; Galina Churkina; Martin Jung; Markus Reichstein; Sönke Zaehle; Alberte Bondeau; Y. Chen; Philippe Ciais; Frauke Feser; Annette Freibauer; Ralf Geyer; Chris D. Jones; Dario Papale; John Tenhunen; Enrico Tomelleri; K. Trusilova; Nicolas Viovy; Martin Heimann;Globally, the year 2003 is associated with one of the largest atmospheric CO<sub>2</sub> rises on record. In the same year, Europe experienced an anomalously strong flux of CO<sub>2</sub> from the land to the atmosphere associated with an exceptionally dry and hot summer in Western and Central Europe. In this study we analyze the magnitude of this carbon flux anomaly and key driving ecosystem processes using simulations of seven terrestrial ecosystem models of different complexity and types (process-oriented and diagnostic). We address the following questions: (1) how large were deviations in the net European carbon flux in 2003 relative to a short-term baseline (1998–2002) and to longer-term variations in annual fluxes (1980 to 2005), (2) which European regions exhibited the largest changes in carbon fluxes during the growing season 2003, and (3) which ecosystem processes controlled the carbon balance anomaly . <br><br> In most models the prominence of 2003 anomaly in carbon fluxes declined with lengthening of the reference period from one year to 16 years. The 2003 anomaly for annual net carbon fluxes ranged between 0.35 and –0.63 Pg C for a reference period of one year and between 0.17 and –0.37 Pg C for a reference period of 16 years for the whole Europe. <br><br> In Western and Central Europe, the anomaly in simulated net ecosystem productivity (NEP) over the growing season in 2003 was outside the 1σ variance bound of the carbon flux anomalies for 1980–2005 in all models. The estimated anomaly in net carbon flux ranged between –42 and –158 Tg C for Western Europe and between 24 and –129 Tg C for Central Europe depending on the model used. All models responded to a dipole pattern of the climate anomaly in 2003. In Western and Central Europe NEP was reduced due to heat and drought. In contrast, lower than normal temperatures and higher air humidity decreased NEP over Northeastern Europe. While models agree on the sign of changes in simulated NEP and gross primary productivity in 2003 over Western and Central Europe, models diverge in the estimates of anomalies in ecosystem respiration. Except for two process models which simulate respiration increase, most models simulated a decrease in ecosystem respiration in 2003. The diagnostic models showed a weaker decrease in ecosystem respiration than the process-oriented models. Based on the multi-model simulations we estimated the total carbon flux anomaly over the 2003 growing season in Europe to range between –0.02 and –0.27 Pg C relative to the net carbon flux in 1998–2002.
add ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.5194/bg-5-561-2008&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.euAccess RoutesGreen gold 135 citations 135 popularity Top 10% influence Top 10% impulse Top 1% Powered by BIP!more_vert add ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.5194/bg-5-561-2008&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Article , Research , Preprint , Other literature type 2012 Switzerland, FrancePublisher:Copernicus GmbH Taketo Hashioka; Meike Vogt; Yasuhiro Yamanaka; C. Le Quéré; Erik T. Buitenhuis; Maki Noguchi Aita; Séverine Alvain; Laurent Bopp; Takafumi Hirata; Ivan D. Lima; Sévrine F. Sailley; Scott C. Doney;We investigated the mechanisms of phytoplankton competition during the spring bloom,one of the most dramatic seasonal events in lower-trophic level ecosystems, in fourstate-of-the-art Plankton Functional Type (PFTs) models: PISCES, NEMURO, Plank-TOM5 and CCSM-BEC. In particular, we investigated the relative importance of dif-5ferent ecophysiological processes on the determination of the community structure,focusing both on the bottom-up and the top-down controls. The models reasonablyreproduced the observed global distribution and seasonal variation of phytoplanktonbiomass. The fraction of diatoms with respect to the total phytoplankton biomass in-creases with the magnitude of the spring bloom in all models. However, the governing10mechanisms differ between models, despite the fact that current PFT models repre-sent ecophysiological processes using the same types of parameterizations. The in-creasing trend in the percentage of diatoms with increasing bloom magnitude is mainlycaused by a stronger nutrient dependence of photosynthesis for diatoms compared tonanophytoplankton (bottom-up control). The difference in the maximum photosynthesis rate plays an important role in NEMURO and PlankTOM5 and determines the abso-lute values of the percentage of diatoms during the bloom. In CCSM-BEC, the lightdependency of photosynthesis plays an important role in the North Atlantic and theSouthern Ocean. The grazing pressure by zooplankton (top-down control), however,strongly contributes to the dominance of diatoms in PISCES and CCSM-BEC. The re-20gional differences in the percentage of diatoms in PlankTOM5 are mainly determinedby top-down control. These differences in the mechanisms suggest that the responseof marine ecosystems to climate change could significantly differ among models, evenif the present-day ecosystem is reproduced to a similar degree of confidence. For fur-ther understanding of plankton competition and for the prediction of future change in marine ecosystems, it is important to understand the relative differences in each phys-iological rate and life history rate in the bottom-up and the top-down controls betweenPFTs Biogeosciences Discussions, 9 (12) ISSN:1810-6277 ISSN:1810-6285
Biogeosciences arrow_drop_down HAL - Université de Lille; Mémoires en Sciences de l'Information et de la Communication; HAL-CEA; HAL-IRDArticle . 2013License: CC BY NCFull-Text: https://hal.science/hal-00880488/documentadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.5194/bgd-9-18083-2012&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.euAccess RoutesGreen gold 63 citations 63 popularity Top 10% influence Top 10% impulse Top 10% Powered by BIP!more_vert Biogeosciences arrow_drop_down HAL - Université de Lille; Mémoires en Sciences de l'Information et de la Communication; HAL-CEA; HAL-IRDArticle . 2013License: CC BY NCFull-Text: https://hal.science/hal-00880488/documentadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.5194/bgd-9-18083-2012&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Article , Research , Other literature type , Preprint , Conference object 2010 France, GermanyPublisher:Copernicus GmbH Martin, Manuel, Pascal; Wattenbach, M.; Smith, P.; Meersmans, Jeroen; Jolivet, Claudy, C.; Boulonne, Line; Arrouays, Dominique, D.;Article en open access; International audience; Soil organic carbon plays a major role in the global carbon budget, and can act as a source or a sink of atmospheric carbon, thereby possibly influencing the course of climate change. Changes in soil organic carbon (SOC) stocks are now taken into account in international negotiations regarding climate change. Consequently, developing sampling schemes and models for estimating the spatial distribution of SOC stocks is a priority. The French soil monitoring network has been established on a 16 km x 16 km grid and the first sampling campaign has recently been completed, providing around 2200 measurements of stocks of soil organic carbon, obtained through an in situ composite sampling, uniformly distributed over the French territory. We calibrated a boosted regression tree model on the observed stocks, modelling SOC stocks as a function of other variables such as climatic parameters, vegetation net primary productivity, soil properties and land use. The calibrated model was evaluated through cross-validation and eventually used for estimating SOC stocks for mainland France. Two other models were calibrated on forest and agricultural soils separately, in order to assess more precisely the influence of pedo-climatic variables on SOC for such soils. The boosted regression tree model showed good predictive ability, and enabled quantification of relationships between SOC stocks and pedo-climatic variables (plus their interactions) over the French territory. These relationships strongly depended on the land use, and more specifically, differed between forest soils and cultivated soil. The total estimate of SOC stocks in France was 3.260 +/- 0.872 PgC for the first 30 cm. It was compared to another estimate, based on the previously published European soil organic carbon and bulk density maps, of 5.303 PgC. We demonstrate that the present estimate might better represent the actual SOC stock distributions of France, and consequently that the previously published approach at the European level greatly overestimates SOC stocks.
ProdInra arrow_drop_down GFZ German Research Centre for GeosciencesArticle . 2011Data sources: GFZ German Research Centre for GeosciencesGFZ German Research Centre for GeosciencesArticle . 2011Data sources: GFZ German Research Centre for GeosciencesMémoires en Sciences de l'Information et de la Communication; Hal-DiderotConference object . 2011Full-Text: https://hal.inrae.fr/hal-02805919/documentadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.5194/bgd-7-8409-2010&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.euAccess Routesgold 243 citations 243 popularity Top 1% influence Top 10% impulse Top 10% Powered by BIP!more_vert ProdInra arrow_drop_down GFZ German Research Centre for GeosciencesArticle . 2011Data sources: GFZ German Research Centre for GeosciencesGFZ German Research Centre for GeosciencesArticle . 2011Data sources: GFZ German Research Centre for GeosciencesMémoires en Sciences de l'Information et de la Communication; Hal-DiderotConference object . 2011Full-Text: https://hal.inrae.fr/hal-02805919/documentadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.5194/bgd-7-8409-2010&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Article , Other literature type , Research , Preprint 2016 United Kingdom, FrancePublisher:Copernicus GmbH Funded by:NSF | Center for Remote Sensing...NSF| Center for Remote Sensing of Ice Sheets (CReSIS)Authors: Benjamin Smith; Noel Gourmelen; A. Huth; Ian Joughin;Benjamin Smith; Noel Gourmelen; A. Huth; Ian Joughin;Abstract. We present conventional and swath altimetry data from CryoSat-2, revealing a system of subglacial lakes that drained between June 2013 and January 2014 under the central part of Thwaites Glacier, West Antarctica (TWG). Much of the drainage happened in less than 6 months, with an apparent connection between three lakes spanning more than 130 km. Hydro-potential analysis of the glacier bed shows a large number of small closed basins that should trap water produced by subglacial melt, although the observed large-scale motion of water suggests that water can sometimes locally move against the apparent potential gradient, at least during lake-drainage events. This shows that there are important limitations in the ability of hydro-potential maps to predict subglacial water flow. An interpretation based on a map of the melt rate suggests that lake drainages of this type should take place every 20–80 years, depending on the connectivity of the water flow at the bed. Although we observed an acceleration in the downstream part of TWG immediately before the start of the lake drainage, there is no clear connection between the drainage and any speed change of the glacier.
The Cryosphere (TC) arrow_drop_down https://doi.org/10.5194/tc-201...Preprint . 2016 . Peer-reviewedLicense: CC BYData sources: CrossrefMémoires en Sciences de l'Information et de la CommunicationArticle . 2017License: CC BYFull-Text: https://hal.science/hal-01858777/documentadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.5194/tc-2016-180&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.euAccess RoutesGreen gold 69 citations 69 popularity Top 1% influence Top 10% impulse Top 10% Powered by BIP!more_vert The Cryosphere (TC) arrow_drop_down https://doi.org/10.5194/tc-201...Preprint . 2016 . Peer-reviewedLicense: CC BYData sources: CrossrefMémoires en Sciences de l'Information et de la CommunicationArticle . 2017License: CC BYFull-Text: https://hal.science/hal-01858777/documentadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.5194/tc-2016-180&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Article , Preprint , Research , Other literature type 2021 Switzerland, Germany, Belgium, FrancePublisher:Copernicus GmbH S. Doetterl; S. Doetterl; R. K. Asifiwe; G. Baert; F. Bamba; M. Bauters; M. Bauters; P. Boeckx; B. Bukombe; G. Cadisch; M. Cooper; L. N. Cizungu; A. Hoyt; C. Kabaseke; K. Kalbitz; L. Kidinda; A. Maier; M. Mainka; M. Mainka; J. Mayrock; D. Muhindo; B. B. Mujinya; S. M. Mukotanyi; L. Nabahungu; M. Reichenbach; B. Rewald; J. Six; A. Stegmann; L. Summerauer; R. Unseld; B. Vanlauwe; K. Van Oost; K. Van Oost; K. Verheyen; C. Vogel; F. Wilken; F. Wilken; P. Fiener;The African Tropics are hotspots of modern-day land use change and are, at the same time, of great relevance for the cycling of carbon (C) and nutrients between plants, soils, and the atmosphere. However, the consequences of land conversion on biogeochemical cycles are still largely unknown as they are not studied in a landscape context that defines the geomorphic, geochemical, and pedological framework in which biological processes take place. Thus, the response of tropical soils to disturbance by erosion and land conversion is one of the great uncertainties in assessing the carrying capacity of tropical landscapes to grow food for future generations and in predicting greenhouse gas fluxes from soils to the atmosphere and, hence, future earth system dynamics. Here we describe version 1.0 of an open-access database created as part of the project “Tropical soil organic carbon dynamics along erosional disturbance gradients in relation to variability in soil geochemistry and land use” (TropSOC). TropSOC v1.0 (Doetterl et al., 2021, https://doi.org/10.5880/fidgeo.2021.009) contains spatially and temporally explicit data on soil, vegetation, environmental properties, and land management collected from 136 pristine tropical forest and cropland plots between 2017 and 2020 as part of monitoring and sampling campaigns in the eastern Congo Basin and the East African Rift Valley system. The results of several laboratory experiments focusing on soil microbial activity, C cycling, and C stabilization in soils complement the dataset to deliver one of the first landscape-scale datasets to study the linkages and feedbacks between geology, geomorphology, and pedogenesis as controls on biogeochemical cycles in a variety of natural and managed systems in the African Tropics. The hierarchical and interdisciplinary structure of the TropSOC database allows linking of a wide range of parameters and observations on soil and vegetation dynamics along with other supporting information that may also be measured at one or more levels of the hierarchy. TropSOC's data mark a significant contribution to improve our understanding of the fate of biogeochemical cycles in dynamic and diverse tropical African (agro-)ecosystems. TropSOC v1.0 can be accessed through the Supplement provided as part of this paper or as a separate download via the websites of the Congo Biogeochemistry Observatory and GFZ Data Services where version updates to the database will be provided as the project develops. Earth System Science Data, 13 (8) ISSN:1866-3508 ISSN:1866-3516
Ghent University Aca... arrow_drop_down Ghent University Academic BibliographyArticle . 2021Data sources: Ghent University Academic Bibliographyhttps://doi.org/10.5194/essd-2...Preprint . 2021 . Peer-reviewedLicense: CC BYData sources: CrossrefEarth System Science Data (ESSD)Article . 2021 . Peer-reviewedLicense: CC BYData sources: CrossrefEarth System Science Data (ESSD); Earth System Science DataArticle . Preprint . 2021License: CC BYGhent University Academic BibliographyArticle . 2021Data sources: Ghent University Academic Bibliographyadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.5194/essd-2021-73&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.euAccess RoutesGreen gold 12 citations 12 popularity Top 10% influence Average impulse Top 10% Powered by BIP!more_vert Ghent University Aca... arrow_drop_down Ghent University Academic BibliographyArticle . 2021Data sources: Ghent University Academic Bibliographyhttps://doi.org/10.5194/essd-2...Preprint . 2021 . Peer-reviewedLicense: CC BYData sources: CrossrefEarth System Science Data (ESSD)Article . 2021 . Peer-reviewedLicense: CC BYData sources: CrossrefEarth System Science Data (ESSD); Earth System Science DataArticle . Preprint . 2021License: CC BYGhent University Academic BibliographyArticle . 2021Data sources: Ghent University Academic Bibliographyadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.5194/essd-2021-73&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Article , Research , Preprint , Other literature type 2009 Germany, France, FrancePublisher:Copernicus GmbH Authors: Jung, M.; Reichstein, M.; Bondeau, Alberte;Jung, M.; Reichstein, M.; Bondeau, Alberte;Abstract. Global, spatially and temporally explicit estimates of carbon and water fluxes derived from empirical up-scaling eddy covariance measurements would constitute a new and possibly powerful data stream to study the variability of the global terrestrial carbon and water cycle. This paper introduces and validates a machine learning approach dedicated to the upscaling of observations from the current global network of eddy covariance towers (FLUXNET). We present a new model TRee Induction ALgorithm (TRIAL) that performs hierarchical stratification of the data set into units where particular multiple regressions for a target variable hold. We propose an ensemble approach (Evolving tRees with RandOm gRowth, ERROR) where the base learning algorithm is perturbed in order to gain a diverse sequence of different model trees which evolves over time. We evaluate the efficiency of the model tree ensemble approach using an artificial data set derived from the the Lund-Potsdam-Jena managed Land (LPJmL) biosphere model. We aim at reproducing global monthly gross primary production as simulated by LPJmL from 1998–2005 using only locations and months where high quality FLUXNET data exist for the training of the model trees. The model trees are trained with the LPJmL land cover and meteorological input data, climate data, and the fraction of absorbed photosynthetic active radiation simulated by LPJmL. Given that we know the "true result" in the form of global LPJmL simulations we can effectively study the performance of the model tree ensemble upscaling and associated problems of extrapolation capacity. We show that the model tree ensemble is able to explain 92% of the variability of the global LPJmL GPP simulations. The mean spatial pattern and the seasonal variability of GPP that constitute the largest sources of variance are very well reproduced (96% and 94% of variance explained respectively) while the monthly interannual anomalies which occupy much less variance are less well matched (41% of variance explained). We demonstrate the substantially improved accuracy of the model tree ensemble over individual model trees in particular for the monthly anomalies and for situations of extrapolation. We estimate that roughly one fifth of the domain is subject to extrapolation while the model tree ensemble is still able to reproduce 73% of the LPJmL GPP variability here. This paper presents for the first time a benchmark for a global FLUXNET upscaling approach that will be employed in future studies. Although the real world FLUXNET upscaling is more complicated than for a noise free and reduced complexity biosphere model as presented here, our results show that an empirical upscaling from the current FLUXNET network with a model tree ensemble is feasible and able to extract global patterns of carbon flux variability.
add ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.5194/bgd-6-5271-2009&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.euAccess RoutesGreen gold 23 citations 23 popularity Top 10% influence Top 10% impulse Top 10% Powered by BIP!more_vert add ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
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For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Research , Article , Other literature type , Preprint 2012 Germany, France, France, France, France, FrancePublisher:Copernicus GmbH Funded by:EC | GLOBISEC| GLOBISSouty, François; Brunelle, Thierry; Dumas, Patrice; Dorin, Bruno; Ciais, Philippe; Crassous, Renaud; Müller, Chistoph; Bondeau, Alberte;25 pages; International audience; Interactions between food demand, biomass energy and forest preservation are driving both food prices and land-use changes, regionally and globally. This study presents a new model called Nexus Land-Use version 1.0 which describes these interactions through a generic representation of agricultural intensification mechanisms. The Nexus Land-Use model equations combine biophysics and economics into a single coherent framework to calculate crop yields, food prices, and resulting pasture and cropland areas within 12 regions inter-connected with each other by international trade. The representation of cropland and livestock production systems in each region relies on three components: (i) a biomass production function derived from the crop yield response function to inputs such as industrial fertilisers; (ii) a detailed representation of the livestock production system subdivided into an intensive and an extensive component, and (iii) a spatially explicit distribution of potential (maximal) crop yields prescribed from the Lund-Postdam-Jena global vegetation model for managed Land (LPJmL). The economic principles governing decisions about land-use and intensification are adapted from the Ricardian rent theory, assuming cost minimisation for farmers. The land-use modelling approach described in this paper entails several advantages. Firstly, it makes it possible to explore interactions among different types of biomass demand for food and animal feed, in a consistent approach, including indirect effects on land-use change resulting from international trade. Secondly, yield variations induced by the possible expansion of croplands on less suitable marginal lands are modelled by using regional land area distributions of potential yields, and a calculated boundary between intensive and extensive production. The model equations and parameter values are first described in details. Then, idealised scenarios exploring the impact of forest preservation policies or rising energy price on agricultural intensification are described, and their impacts on pasture and cropland areas are investigated. http://www.geosci-model-dev.net/5/1297/2012/gmd-5-1297-2012.html
Agritrop arrow_drop_down Geoscientific Model Development (GMD)Other literature type . 2018Data sources: Copernicus PublicationsGeoscientific Model DevelopmentOther literature type . Article . 2012 . Peer-reviewedLicense: CC BYadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
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For further information contact us at helpdesk@openaire.euAccess Routesgold 38 citations 38 popularity Top 10% influence Top 10% impulse Top 10% Powered by BIP!visibility 2visibility views 2 Powered bymore_vert Agritrop arrow_drop_down Geoscientific Model Development (GMD)Other literature type . 2018Data sources: Copernicus PublicationsGeoscientific Model DevelopmentOther literature type . Article . 2012 . Peer-reviewedLicense: CC BYadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
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For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Article , Other literature type , Research , Preprint 2009 France, Germany, France, France, FrancePublisher:Copernicus GmbH Almut Arneth; Stephen Sitch; Alberte Bondeau; Klaus Butterbach-Bahl; P. N. Foster; Nicola Gedney; N. de Noblet-Ducoudré; Iain Colin Prentice; M Sanderson; Kirsten Thonicke; R. Wania; Sönke Zaehle;International audience; Exchange of non-CO 2 trace gases between the land surface and the atmosphere plays an important role in atmospheric chemistry and climate. Recent studies have highlighted its importance for interpretation of glacial-interglacial ice-core records, the simulation of the pre-industrial and present atmosphere, and the potential for large climate-chemistry and climate-aerosol feedbacks in the coming century. However, spatial and temporal variations in trace gas emissions and the magnitude of future feedbacks are a major source of uncertainty in atmospheric chemistry, air quality and climate science. To reduce such uncertainties Dynamic Global Vegetation Models (DGVMs) are currently being expanded to mechanistically represent processes relevant to non-CO 2 trace gas exchange between land biota and the atmosphere. In this paper we present a review of im-Correspondence to: A. Arneth (almut.arneth@nateko.lu.se) portant non-CO 2 trace gas emissions, the state-of-the-art in DGVM modelling of processes regulating these emissions, identify key uncertainties for global scale model applications , and discuss a methodology for model integration and evaluation.
MPG.PuRe arrow_drop_down HAL AMU; Mémoires en Sciences de l'Information et de la Communication; HAL-CEA; HAL-IRDArticle . 2010License: CC BYadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.5194/bgd-6-7717-2009&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.euAccess RoutesGreen gold 82 citations 82 popularity Top 10% influence Top 10% impulse Top 10% Powered by BIP!more_vert MPG.PuRe arrow_drop_down HAL AMU; Mémoires en Sciences de l'Information et de la Communication; HAL-CEA; HAL-IRDArticle . 2010License: CC BYadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
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description Publicationkeyboard_double_arrow_right Research , Article , Other literature type , Preprint 2019 France, Germany, France, SwitzerlandPublisher:Copernicus GmbH Funded by:SNSF | Glacial Hazard Monitoring...SNSF| Glacial Hazard Monitoring with Seismology (GlaHMSeis)Authors: Fabian Lindner; Fabian Walter; Gabi Laske; Florent Gimbert;Fabian Lindner; Fabian Walter; Gabi Laske; Florent Gimbert;Hydraulic processes impact viscous and brittle ice deformation. Water-driven fracturing as well as turbulent waterflow within and beneath glaciers radiate seismic waves which provide insights into otherwise hard-to-access englacial and subglacial environments. In this study, we analyze glaciohydraulic tremors recorded by four seismic arrays installed in different parts of Glacier de la Plaine Morte, Switzerland. Data were recorded during the 2016 melt season including the sudden subglacial drainage of an ice-marginal lake. Together with our seismic data, discharge, lake level, and ice flow measurements provide constraints on glacier hydraulics. We find that the tremors are generated by subglacial water flow, in moulins, and byicequake bursts. The dominating process can vary on sub-kilometer and sub-daily scales. Consistent with field observations,continuous source tracking via matched-field processing suggests a gradual upglacier progression of an efficient drainage sys-tem as the melt season progresses. The ice-marginal lake likely connects to this drainage system via hydrofracturing, whichis indicated by sustained icequake signals emitted from the proximity of the lake basin and starting roughly 24 hours prior to the lake drainage. To estimate the hydraulics associated with the drainage, we use tremor-discharge scaling relationships. Our analysis suggests a pressurization of the subglacial environment at the drainage onset, followed by an increase in the hydraulicradii of the conduits and a subsequent decrease in the subglacial water pressure as the capacity of the drainage system increases.The pressurization is in phase with the drop in the lake level and its retrieved maximum coincides with ice-uplift measured via GPS. Our results highlight the use of cryo-seismology for monitoring glacier hydraulics The Cryosphere Discussions ISSN:1994-0440 ISSN:1994-0432
The Cryosphere arrow_drop_down GFZ German Research Centre for GeosciencesArticle . 2020Data sources: GFZ German Research Centre for Geosciencesadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.5194/tc-2019-155&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.euAccess RoutesGreen gold 0 citations 0 popularity Average influence Average impulse Average Powered by BIP!more_vert The Cryosphere arrow_drop_down GFZ German Research Centre for GeosciencesArticle . 2020Data sources: GFZ German Research Centre for Geosciencesadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.5194/tc-2019-155&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Conference object , Research 2007 France EnglishAuthors: Longdoz, Bernard,;Longdoz, Bernard,;ProdInra arrow_drop_down Mémoires en Sciences de l'Information et de la Communication; Hal-DiderotConference object . 2007Full-Text: https://hal.inrae.fr/hal-02814185/documentAll Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=od_______212::79336ec32894910b5843fd0678c634be&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eu0 citations 0 popularity Average influence Average impulse Average Powered by BIP!more_vert ProdInra arrow_drop_down Mémoires en Sciences de l'Information et de la Communication; Hal-DiderotConference object . 2007Full-Text: https://hal.inrae.fr/hal-02814185/documentAll Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=od_______212::79336ec32894910b5843fd0678c634be&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Article , Research , Other literature type 2008 France, France, GermanyPublisher:Copernicus GmbH Mona Vetter; Galina Churkina; Martin Jung; Markus Reichstein; Sönke Zaehle; Alberte Bondeau; Y. Chen; Philippe Ciais; Frauke Feser; Annette Freibauer; Ralf Geyer; Chris D. Jones; Dario Papale; John Tenhunen; Enrico Tomelleri; K. Trusilova; Nicolas Viovy; Martin Heimann;Globally, the year 2003 is associated with one of the largest atmospheric CO<sub>2</sub> rises on record. In the same year, Europe experienced an anomalously strong flux of CO<sub>2</sub> from the land to the atmosphere associated with an exceptionally dry and hot summer in Western and Central Europe. In this study we analyze the magnitude of this carbon flux anomaly and key driving ecosystem processes using simulations of seven terrestrial ecosystem models of different complexity and types (process-oriented and diagnostic). We address the following questions: (1) how large were deviations in the net European carbon flux in 2003 relative to a short-term baseline (1998–2002) and to longer-term variations in annual fluxes (1980 to 2005), (2) which European regions exhibited the largest changes in carbon fluxes during the growing season 2003, and (3) which ecosystem processes controlled the carbon balance anomaly . <br><br> In most models the prominence of 2003 anomaly in carbon fluxes declined with lengthening of the reference period from one year to 16 years. The 2003 anomaly for annual net carbon fluxes ranged between 0.35 and –0.63 Pg C for a reference period of one year and between 0.17 and –0.37 Pg C for a reference period of 16 years for the whole Europe. <br><br> In Western and Central Europe, the anomaly in simulated net ecosystem productivity (NEP) over the growing season in 2003 was outside the 1σ variance bound of the carbon flux anomalies for 1980–2005 in all models. The estimated anomaly in net carbon flux ranged between –42 and –158 Tg C for Western Europe and between 24 and –129 Tg C for Central Europe depending on the model used. All models responded to a dipole pattern of the climate anomaly in 2003. In Western and Central Europe NEP was reduced due to heat and drought. In contrast, lower than normal temperatures and higher air humidity decreased NEP over Northeastern Europe. While models agree on the sign of changes in simulated NEP and gross primary productivity in 2003 over Western and Central Europe, models diverge in the estimates of anomalies in ecosystem respiration. Except for two process models which simulate respiration increase, most models simulated a decrease in ecosystem respiration in 2003. The diagnostic models showed a weaker decrease in ecosystem respiration than the process-oriented models. Based on the multi-model simulations we estimated the total carbon flux anomaly over the 2003 growing season in Europe to range between –0.02 and –0.27 Pg C relative to the net carbon flux in 1998–2002.
add ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.5194/bg-5-561-2008&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.euAccess RoutesGreen gold 135 citations 135 popularity Top 10% influence Top 10% impulse Top 1% Powered by BIP!more_vert add ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.5194/bg-5-561-2008&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Article , Research , Preprint , Other literature type 2012 Switzerland, FrancePublisher:Copernicus GmbH Taketo Hashioka; Meike Vogt; Yasuhiro Yamanaka; C. Le Quéré; Erik T. Buitenhuis; Maki Noguchi Aita; Séverine Alvain; Laurent Bopp; Takafumi Hirata; Ivan D. Lima; Sévrine F. Sailley; Scott C. Doney;We investigated the mechanisms of phytoplankton competition during the spring bloom,one of the most dramatic seasonal events in lower-trophic level ecosystems, in fourstate-of-the-art Plankton Functional Type (PFTs) models: PISCES, NEMURO, Plank-TOM5 and CCSM-BEC. In particular, we investigated the relative importance of dif-5ferent ecophysiological processes on the determination of the community structure,focusing both on the bottom-up and the top-down controls. The models reasonablyreproduced the observed global distribution and seasonal variation of phytoplanktonbiomass. The fraction of diatoms with respect to the total phytoplankton biomass in-creases with the magnitude of the spring bloom in all models. However, the governing10mechanisms differ between models, despite the fact that current PFT models repre-sent ecophysiological processes using the same types of parameterizations. The in-creasing trend in the percentage of diatoms with increasing bloom magnitude is mainlycaused by a stronger nutrient dependence of photosynthesis for diatoms compared tonanophytoplankton (bottom-up control). The difference in the maximum photosynthesis rate plays an important role in NEMURO and PlankTOM5 and determines the abso-lute values of the percentage of diatoms during the bloom. In CCSM-BEC, the lightdependency of photosynthesis plays an important role in the North Atlantic and theSouthern Ocean. The grazing pressure by zooplankton (top-down control), however,strongly contributes to the dominance of diatoms in PISCES and CCSM-BEC. The re-20gional differences in the percentage of diatoms in PlankTOM5 are mainly determinedby top-down control. These differences in the mechanisms suggest that the responseof marine ecosystems to climate change could significantly differ among models, evenif the present-day ecosystem is reproduced to a similar degree of confidence. For fur-ther understanding of plankton competition and for the prediction of future change in marine ecosystems, it is important to understand the relative differences in each phys-iological rate and life history rate in the bottom-up and the top-down controls betweenPFTs Biogeosciences Discussions, 9 (12) ISSN:1810-6277 ISSN:1810-6285
Biogeosciences arrow_drop_down HAL - Université de Lille; Mémoires en Sciences de l'Information et de la Communication; HAL-CEA; HAL-IRDArticle . 2013License: CC BY NCFull-Text: https://hal.science/hal-00880488/documentadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.5194/bgd-9-18083-2012&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.euAccess RoutesGreen gold 63 citations 63 popularity Top 10% influence Top 10% impulse Top 10% Powered by BIP!more_vert Biogeosciences arrow_drop_down HAL - Université de Lille; Mémoires en Sciences de l'Information et de la Communication; HAL-CEA; HAL-IRDArticle . 2013License: CC BY NCFull-Text: https://hal.science/hal-00880488/documentadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.5194/bgd-9-18083-2012&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Article , Research , Other literature type , Preprint , Conference object 2010 France, GermanyPublisher:Copernicus GmbH Martin, Manuel, Pascal; Wattenbach, M.; Smith, P.; Meersmans, Jeroen; Jolivet, Claudy, C.; Boulonne, Line; Arrouays, Dominique, D.;Article en open access; International audience; Soil organic carbon plays a major role in the global carbon budget, and can act as a source or a sink of atmospheric carbon, thereby possibly influencing the course of climate change. Changes in soil organic carbon (SOC) stocks are now taken into account in international negotiations regarding climate change. Consequently, developing sampling schemes and models for estimating the spatial distribution of SOC stocks is a priority. The French soil monitoring network has been established on a 16 km x 16 km grid and the first sampling campaign has recently been completed, providing around 2200 measurements of stocks of soil organic carbon, obtained through an in situ composite sampling, uniformly distributed over the French territory. We calibrated a boosted regression tree model on the observed stocks, modelling SOC stocks as a function of other variables such as climatic parameters, vegetation net primary productivity, soil properties and land use. The calibrated model was evaluated through cross-validation and eventually used for estimating SOC stocks for mainland France. Two other models were calibrated on forest and agricultural soils separately, in order to assess more precisely the influence of pedo-climatic variables on SOC for such soils. The boosted regression tree model showed good predictive ability, and enabled quantification of relationships between SOC stocks and pedo-climatic variables (plus their interactions) over the French territory. These relationships strongly depended on the land use, and more specifically, differed between forest soils and cultivated soil. The total estimate of SOC stocks in France was 3.260 +/- 0.872 PgC for the first 30 cm. It was compared to another estimate, based on the previously published European soil organic carbon and bulk density maps, of 5.303 PgC. We demonstrate that the present estimate might better represent the actual SOC stock distributions of France, and consequently that the previously published approach at the European level greatly overestimates SOC stocks.
ProdInra arrow_drop_down GFZ German Research Centre for GeosciencesArticle . 2011Data sources: GFZ German Research Centre for GeosciencesGFZ German Research Centre for GeosciencesArticle . 2011Data sources: GFZ German Research Centre for GeosciencesMémoires en Sciences de l'Information et de la Communication; Hal-DiderotConference object . 2011Full-Text: https://hal.inrae.fr/hal-02805919/documentadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.5194/bgd-7-8409-2010&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.euAccess Routesgold 243 citations 243 popularity Top 1% influence Top 10% impulse Top 10% Powered by BIP!more_vert ProdInra arrow_drop_down GFZ German Research Centre for GeosciencesArticle . 2011Data sources: GFZ German Research Centre for GeosciencesGFZ German Research Centre for GeosciencesArticle . 2011Data sources: GFZ German Research Centre for GeosciencesMémoires en Sciences de l'Information et de la Communication; Hal-DiderotConference object . 2011Full-Text: https://hal.inrae.fr/hal-02805919/documentadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.5194/bgd-7-8409-2010&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Article , Other literature type , Research , Preprint 2016 United Kingdom, FrancePublisher:Copernicus GmbH Funded by:NSF | Center for Remote Sensing...NSF| Center for Remote Sensing of Ice Sheets (CReSIS)Authors: Benjamin Smith; Noel Gourmelen; A. Huth; Ian Joughin;Benjamin Smith; Noel Gourmelen; A. Huth; Ian Joughin;Abstract. We present conventional and swath altimetry data from CryoSat-2, revealing a system of subglacial lakes that drained between June 2013 and January 2014 under the central part of Thwaites Glacier, West Antarctica (TWG). Much of the drainage happened in less than 6 months, with an apparent connection between three lakes spanning more than 130 km. Hydro-potential analysis of the glacier bed shows a large number of small closed basins that should trap water produced by subglacial melt, although the observed large-scale motion of water suggests that water can sometimes locally move against the apparent potential gradient, at least during lake-drainage events. This shows that there are important limitations in the ability of hydro-potential maps to predict subglacial water flow. An interpretation based on a map of the melt rate suggests that lake drainages of this type should take place every 20–80 years, depending on the connectivity of the water flow at the bed. Although we observed an acceleration in the downstream part of TWG immediately before the start of the lake drainage, there is no clear connection between the drainage and any speed change of the glacier.
The Cryosphere (TC) arrow_drop_down https://doi.org/10.5194/tc-201...Preprint . 2016 . Peer-reviewedLicense: CC BYData sources: CrossrefMémoires en Sciences de l'Information et de la CommunicationArticle . 2017License: CC BYFull-Text: https://hal.science/hal-01858777/documentadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.5194/tc-2016-180&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.euAccess RoutesGreen gold 69 citations 69 popularity Top 1% influence Top 10% impulse Top 10% Powered by BIP!more_vert The Cryosphere (TC) arrow_drop_down https://doi.org/10.5194/tc-201...Preprint . 2016 . Peer-reviewedLicense: CC BYData sources: CrossrefMémoires en Sciences de l'Information et de la CommunicationArticle . 2017License: CC BYFull-Text: https://hal.science/hal-01858777/documentadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.5194/tc-2016-180&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Article , Preprint , Research , Other literature type 2021 Switzerland, Germany, Belgium, FrancePublisher:Copernicus GmbH S. Doetterl; S. Doetterl; R. K. Asifiwe; G. Baert; F. Bamba; M. Bauters; M. Bauters; P. Boeckx; B. Bukombe; G. Cadisch; M. Cooper; L. N. Cizungu; A. Hoyt; C. Kabaseke; K. Kalbitz; L. Kidinda; A. Maier; M. Mainka; M. Mainka; J. Mayrock; D. Muhindo; B. B. Mujinya; S. M. Mukotanyi; L. Nabahungu; M. Reichenbach; B. Rewald; J. Six; A. Stegmann; L. Summerauer; R. Unseld; B. Vanlauwe; K. Van Oost; K. Van Oost; K. Verheyen; C. Vogel; F. Wilken; F. Wilken; P. Fiener;The African Tropics are hotspots of modern-day land use change and are, at the same time, of great relevance for the cycling of carbon (C) and nutrients between plants, soils, and the atmosphere. However, the consequences of land conversion on biogeochemical cycles are still largely unknown as they are not studied in a landscape context that defines the geomorphic, geochemical, and pedological framework in which biological processes take place. Thus, the response of tropical soils to disturbance by erosion and land conversion is one of the great uncertainties in assessing the carrying capacity of tropical landscapes to grow food for future generations and in predicting greenhouse gas fluxes from soils to the atmosphere and, hence, future earth system dynamics. Here we describe version 1.0 of an open-access database created as part of the project “Tropical soil organic carbon dynamics along erosional disturbance gradients in relation to variability in soil geochemistry and land use” (TropSOC). TropSOC v1.0 (Doetterl et al., 2021, https://doi.org/10.5880/fidgeo.2021.009) contains spatially and temporally explicit data on soil, vegetation, environmental properties, and land management collected from 136 pristine tropical forest and cropland plots between 2017 and 2020 as part of monitoring and sampling campaigns in the eastern Congo Basin and the East African Rift Valley system. The results of several laboratory experiments focusing on soil microbial activity, C cycling, and C stabilization in soils complement the dataset to deliver one of the first landscape-scale datasets to study the linkages and feedbacks between geology, geomorphology, and pedogenesis as controls on biogeochemical cycles in a variety of natural and managed systems in the African Tropics. The hierarchical and interdisciplinary structure of the TropSOC database allows linking of a wide range of parameters and observations on soil and vegetation dynamics along with other supporting information that may also be measured at one or more levels of the hierarchy. TropSOC's data mark a significant contribution to improve our understanding of the fate of biogeochemical cycles in dynamic and diverse tropical African (agro-)ecosystems. TropSOC v1.0 can be accessed through the Supplement provided as part of this paper or as a separate download via the websites of the Congo Biogeochemistry Observatory and GFZ Data Services where version updates to the database will be provided as the project develops. Earth System Science Data, 13 (8) ISSN:1866-3508 ISSN:1866-3516
Ghent University Aca... arrow_drop_down Ghent University Academic BibliographyArticle . 2021Data sources: Ghent University Academic Bibliographyhttps://doi.org/10.5194/essd-2...Preprint . 2021 . Peer-reviewedLicense: CC BYData sources: CrossrefEarth System Science Data (ESSD)Article . 2021 . Peer-reviewedLicense: CC BYData sources: CrossrefEarth System Science Data (ESSD); Earth System Science DataArticle . Preprint . 2021License: CC BYGhent University Academic BibliographyArticle . 2021Data sources: Ghent University Academic Bibliographyadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.5194/essd-2021-73&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.euAccess RoutesGreen gold 12 citations 12 popularity Top 10% influence Average impulse Top 10% Powered by BIP!more_vert Ghent University Aca... arrow_drop_down Ghent University Academic BibliographyArticle . 2021Data sources: Ghent University Academic Bibliographyhttps://doi.org/10.5194/essd-2...Preprint . 2021 . Peer-reviewedLicense: CC BYData sources: CrossrefEarth System Science Data (ESSD)Article . 2021 . Peer-reviewedLicense: CC BYData sources: CrossrefEarth System Science Data (ESSD); Earth System Science DataArticle . Preprint . 2021License: CC BYGhent University Academic BibliographyArticle . 2021Data sources: Ghent University Academic Bibliographyadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.5194/essd-2021-73&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Article , Research , Preprint , Other literature type 2009 Germany, France, FrancePublisher:Copernicus GmbH Authors: Jung, M.; Reichstein, M.; Bondeau, Alberte;Jung, M.; Reichstein, M.; Bondeau, Alberte;Abstract. Global, spatially and temporally explicit estimates of carbon and water fluxes derived from empirical up-scaling eddy covariance measurements would constitute a new and possibly powerful data stream to study the variability of the global terrestrial carbon and water cycle. This paper introduces and validates a machine learning approach dedicated to the upscaling of observations from the current global network of eddy covariance towers (FLUXNET). We present a new model TRee Induction ALgorithm (TRIAL) that performs hierarchical stratification of the data set into units where particular multiple regressions for a target variable hold. We propose an ensemble approach (Evolving tRees with RandOm gRowth, ERROR) where the base learning algorithm is perturbed in order to gain a diverse sequence of different model trees which evolves over time. We evaluate the efficiency of the model tree ensemble approach using an artificial data set derived from the the Lund-Potsdam-Jena managed Land (LPJmL) biosphere model. We aim at reproducing global monthly gross primary production as simulated by LPJmL from 1998–2005 using only locations and months where high quality FLUXNET data exist for the training of the model trees. The model trees are trained with the LPJmL land cover and meteorological input data, climate data, and the fraction of absorbed photosynthetic active radiation simulated by LPJmL. Given that we know the "true result" in the form of global LPJmL simulations we can effectively study the performance of the model tree ensemble upscaling and associated problems of extrapolation capacity. We show that the model tree ensemble is able to explain 92% of the variability of the global LPJmL GPP simulations. The mean spatial pattern and the seasonal variability of GPP that constitute the largest sources of variance are very well reproduced (96% and 94% of variance explained respectively) while the monthly interannual anomalies which occupy much less variance are less well matched (41% of variance explained). We demonstrate the substantially improved accuracy of the model tree ensemble over individual model trees in particular for the monthly anomalies and for situations of extrapolation. We estimate that roughly one fifth of the domain is subject to extrapolation while the model tree ensemble is still able to reproduce 73% of the LPJmL GPP variability here. This paper presents for the first time a benchmark for a global FLUXNET upscaling approach that will be employed in future studies. Although the real world FLUXNET upscaling is more complicated than for a noise free and reduced complexity biosphere model as presented here, our results show that an empirical upscaling from the current FLUXNET network with a model tree ensemble is feasible and able to extract global patterns of carbon flux variability.
add ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.5194/bgd-6-5271-2009&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.euAccess RoutesGreen gold 23 citations 23 popularity Top 10% influence Top 10% impulse Top 10% Powered by BIP!more_vert add ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.5194/bgd-6-5271-2009&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Research , Article , Other literature type , Preprint 2012 Germany, France, France, France, France, FrancePublisher:Copernicus GmbH Funded by:EC | GLOBISEC| GLOBISSouty, François; Brunelle, Thierry; Dumas, Patrice; Dorin, Bruno; Ciais, Philippe; Crassous, Renaud; Müller, Chistoph; Bondeau, Alberte;25 pages; International audience; Interactions between food demand, biomass energy and forest preservation are driving both food prices and land-use changes, regionally and globally. This study presents a new model called Nexus Land-Use version 1.0 which describes these interactions through a generic representation of agricultural intensification mechanisms. The Nexus Land-Use model equations combine biophysics and economics into a single coherent framework to calculate crop yields, food prices, and resulting pasture and cropland areas within 12 regions inter-connected with each other by international trade. The representation of cropland and livestock production systems in each region relies on three components: (i) a biomass production function derived from the crop yield response function to inputs such as industrial fertilisers; (ii) a detailed representation of the livestock production system subdivided into an intensive and an extensive component, and (iii) a spatially explicit distribution of potential (maximal) crop yields prescribed from the Lund-Postdam-Jena global vegetation model for managed Land (LPJmL). The economic principles governing decisions about land-use and intensification are adapted from the Ricardian rent theory, assuming cost minimisation for farmers. The land-use modelling approach described in this paper entails several advantages. Firstly, it makes it possible to explore interactions among different types of biomass demand for food and animal feed, in a consistent approach, including indirect effects on land-use change resulting from international trade. Secondly, yield variations induced by the possible expansion of croplands on less suitable marginal lands are modelled by using regional land area distributions of potential yields, and a calculated boundary between intensive and extensive production. The model equations and parameter values are first described in details. Then, idealised scenarios exploring the impact of forest preservation policies or rising energy price on agricultural intensification are described, and their impacts on pasture and cropland areas are investigated. http://www.geosci-model-dev.net/5/1297/2012/gmd-5-1297-2012.html
Agritrop arrow_drop_down Geoscientific Model Development (GMD)Other literature type . 2018Data sources: Copernicus PublicationsGeoscientific Model DevelopmentOther literature type . Article . 2012 . Peer-reviewedLicense: CC BYadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.5194/gmdd-5-571-2012&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.euAccess Routesgold 38 citations 38 popularity Top 10% influence Top 10% impulse Top 10% Powered by BIP!visibility 2visibility views 2 Powered bymore_vert Agritrop arrow_drop_down Geoscientific Model Development (GMD)Other literature type . 2018Data sources: Copernicus PublicationsGeoscientific Model DevelopmentOther literature type . Article . 2012 . Peer-reviewedLicense: CC BYadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.5194/gmdd-5-571-2012&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Article , Other literature type , Research , Preprint 2009 France, Germany, France, France, FrancePublisher:Copernicus GmbH Almut Arneth; Stephen Sitch; Alberte Bondeau; Klaus Butterbach-Bahl; P. N. Foster; Nicola Gedney; N. de Noblet-Ducoudré; Iain Colin Prentice; M Sanderson; Kirsten Thonicke; R. Wania; Sönke Zaehle;International audience; Exchange of non-CO 2 trace gases between the land surface and the atmosphere plays an important role in atmospheric chemistry and climate. Recent studies have highlighted its importance for interpretation of glacial-interglacial ice-core records, the simulation of the pre-industrial and present atmosphere, and the potential for large climate-chemistry and climate-aerosol feedbacks in the coming century. However, spatial and temporal variations in trace gas emissions and the magnitude of future feedbacks are a major source of uncertainty in atmospheric chemistry, air quality and climate science. To reduce such uncertainties Dynamic Global Vegetation Models (DGVMs) are currently being expanded to mechanistically represent processes relevant to non-CO 2 trace gas exchange between land biota and the atmosphere. In this paper we present a review of im-Correspondence to: A. Arneth (almut.arneth@nateko.lu.se) portant non-CO 2 trace gas emissions, the state-of-the-art in DGVM modelling of processes regulating these emissions, identify key uncertainties for global scale model applications , and discuss a methodology for model integration and evaluation.
MPG.PuRe arrow_drop_down HAL AMU; Mémoires en Sciences de l'Information et de la Communication; HAL-CEA; HAL-IRDArticle . 2010License: CC BYadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.5194/bgd-6-7717-2009&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.euAccess RoutesGreen gold 82 citations 82 popularity Top 10% influence Top 10% impulse Top 10% Powered by BIP!more_vert MPG.PuRe arrow_drop_down HAL AMU; Mémoires en Sciences de l'Information et de la Communication; HAL-CEA; HAL-IRDArticle . 2010License: CC BYadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.5194/bgd-6-7717-2009&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eu