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  • Authors: Dragna, Didier; Emmanuelli, Ariane; Ollivier, S.; Blanc-Benon, Philippe;

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  • Authors: Deleplanque, Samuel; Hosteins, Pierre; Pellegrini, Paola; Rodriguez, Joaquin;

    International audience; This paper treats theoretical and practical aspects of train management in freight shunting yards. It is a literature survey extending the previous ones and presenting the new important papers published in the last decade. The operations realised in such yards are formalised by modelling them in unified modelling language diagrams and the algorithms implemented to solve the optimisation problems of operations management for the different types of freight shunting yards and for the existing models are presented. The details on real yards that can be found in the literature are also reported, to allow the reader understanding what case studies can be actually tackled with the existing methods.

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  • Authors: Dragna, Didier; Emmanuelli, Ariane; Ollivier, S.; Blanc-Benon, Philippe;

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    Authors: Olivier, Léa; Boutin, Jacqueline; Reverdin, Gilles; Lefèvre, Nathalie; +8 Authors

    The key processes driving the air–sea CO2 fluxes in the western tropical Atlantic (WTA) in winter are poorly known. WTA is a highly dynamic oceanic region, expected to have a dominant role in the variability in CO2 air–sea fluxes. In early 2020 (February), this region was the site of a large in situ survey and studied in wider context through satellite measurements. The North Brazil Current (NBC) flows northward along the coast of South America, retroflects close to 8∘ N and pinches off the world's largest eddies, the NBC rings. The rings are formed to the north of the Amazon River mouth when freshwater discharge is still significant in winter (a time period of relatively low run-off). We show that in February 2020, the region (5–16∘ N, 50–59∘ W) is a CO2 sink from the atmosphere to the ocean (−1.7 Tg C per month), a factor of 10 greater than previously estimated. The spatial distribution of CO2 fugacity is strongly influenced by eddies south of 12∘ N. During the campaign, a nutrient-rich freshwater plume from the Amazon River is entrained by a ring from the shelf up to 12∘ N leading to high phytoplankton concentration and significant carbon drawdown (∼20 % of the total sink). In trapping equatorial waters, NBC rings are a small source of CO2. The less variable North Atlantic subtropical water extends from 12∘ N northward and represents ∼60 % of the total sink due to the lower temperature associated with winter cooling and strong winds. Our results, in identifying the key processes influencing the air–sea CO2 flux in the WTA, highlight the role of eddy interactions with the Amazon River plume. It sheds light on how a lack of data impeded a correct assessment of the flux in the past, as well as on the necessity of taking into account features at meso- and small scales.

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  • image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
    Authors: Erraach, Yamna; Jaafer, Fatma; Radić, Ivana; Donner, Mechthild;

    International audience; Product labeling is a way to inform consumers and increase their awareness about sustainability attributes of products. It guarantees the use of specific production conditions, promotes market incentives and highlights environmental, social and/or ethical product attributes. This study provides a literature review of sustainability labels on olive oil including consumer attitudes and behavior towards this product. Results show that consumers have positive attitudes towards olive oil carrying sustainability labels and are willing to pay more for olive oil carrying those labels. However, the major drivers of this behavior are far from being related to sustainability. This insight jeopardizes the main objective of those labels and suggests more clarifications about the information delivered by them. More in-depth investigations are needed about the drivers of consumer behavior towards olive oil carrying sustainability labels.

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    Article . 2021
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    Article . 2021
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    Authors: Kurtz, Amélie; Thomopoulos, Rallou;

    Context. In line with Sustainable Development Goals 3 “Good health and well-being” and 12 “Responsible Consumption and Production”, this paper is concerned with the fragile population of the less-than-3-years-old children. More specifically, it investigates how infant food safety is perceived at the household level and at the level of childhood and health professionals directly in contact with them. Objective. The paper aims to analyze consumer priorities and perceptions of hazards in infant foods qualitatively and quantitatively. Methodology. To do so, a survey was carried out in France on 1750 people representative of the general population. A hybrid method is proposed to analyze the results of the survey, mixing artificial intelligence and statistics. Main insights. Within the declared priorities when choosing infant food, health comes first, with a top ranking for the absence of harmful substances, followed closely by nutritional balance—far ahead of environment, ease of use and price. The results show that the rankings of the hazards that cause the most worry are globally homogeneous throughout the populations (families, professionals, etc.) and higher for chemical contaminants from agricultural practices and packaging. For health professionals, concerns are higher than in the general population for all categories of contaminants, and specific concerns such as risk related to environmental and unknown contaminants are much more prevalent. The perception of risk varies with the food considered. For infant formula in particular, users seem puzzled by somehow contradictory messages. Perspectives. The study is intended to be generalized to Europe.

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    Article . 2021
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    Authors: Bonifácio, Paulo; Neal, Lenka; Menot, Lenaick;

    International audience; The polymetallic nodules lying on the seafloor of the Clarion-Clipperton Fracture Zone (CCFZ) represent over 30 billion metric tons of manganese. A single mining operation has potential to directly impact approximately 200 km2 of the seabed per year. Yet, the biodiversity and functioning of the bentho-demersal ecosystem in the CCFZ remain poorly understood. Recent studies indicate a high species diversity in a food-poor environment, although the area remains poorly sampled. Undersampling is aggravated by a combination of low densities of fauna and high habitat heterogeneity at multiple spatial scales. This study examines the Polynoidae, a diverse family of mobile polychaetes. Sampling with an epibenthic sledge and a remotely operated vehicle was performed during the cruise SO239 within the eastern CCFZ. Five areas under the influence of a sea surface productivity gradient were visited. Specimens were identified using morphology and DNA: (i) to provide a more comprehensive account of polynoid diversity within the CCFZ, (ii) to infer factors potentially driving alpha and beta diversity, and (iii) to test the hypothesis that epibenthic polychaetes have low species turnover and large species range. Patterns of species turnover across the eastern CCFZ were correlated with organic carbon fluxes to the seafloor but there was also a differentiation in the composition of assemblages north and south of the Clarion fracture. In contrast to the previous studies, patterns of alpha taxonomic and phylogenetic diversity both suggest that polynoid assemblages are the most diverse at Area of Particular Environmental Interest no. 3, the most oligotrophic study site, located north of the Clarion fracture. Without ruling out the possibility of sampling bias, the main hypothesis explaining such high diversity is the diversification of polynoid subfamily Macellicephalinae, in response to oligotrophy. We propose that macellicephalins evolved under extremely low food supply conditions through adoption of a semi-pelagic mode of life, which enabled them to colonise new niches at the benthic boundary layer and foster their radiation at great depths.

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  • Authors: Emmanuelli, Ariane; Dragna, Didier; Ollivier, Sébastien; Blanc-Benon, Philippe;

    International audience; The influence of topography on sonic boom propagation is investigated. The full two-dimensional Euler equations in curvilinear coordinates are solved using high-order finite-difference time-domain techniques. Simple ground profiles, corresponding to a terrain depression, a hill, and a sinusoidal terrain, are examined for two sonic boom waves: a classical N-wave and a low-boom. Ground reflection of the sonic boom is affected by elevation variations: a concave ground profile induces compression, which tends to increase the peak pressure in particular, while the opposite is true for convex elevation variations, which lead to expansion and a reduction in peak pressure. The reflected boom is then strongly altered. Furthermore, a sufficiently concave topography can cause focal zones, which generate extra contributions at ground level in the form of U-waves in addition to the reflected wave. This mechanism has the largest effect on waveforms at ground level. The variations of standard metrics are of a few dBs compared to a flat ground for both sonic boom waves, and they are notably greater for the terrain depression than for the hill. Finally, in the case of a sinusoidal terrain, the pressure waveforms are composed of multiple arrivals due to successive focal zones.

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    Authors: Donner, Mechthild; Radić, Ivana;

    International audience; Considering the large amounts of harmful waste produced in the Mediterranean olive sector, entrepreneurial initiatives creating value from olive waste and by-products via circular bio-economy approaches are reviewed. These circular business models aim to enhance the functionality use of olive trees beyond traditional patterns for value creation. The study focuses on business drivers and value creation mechanisms, and specifically on conversion pathways of olive waste towards new value propositions. In total, 41 cases are analyzed mainly according to the Business Model Canvas components with NVivo, based on data gathered from an extensive online search mainly of company websites and reports, online articles, research project reports, professional websites, and newsletters. Results indicate that some innovative businesses have emerged specializing in the domain of olive waste valorization, driven by environmental concerns and mainly focusing on bioenergy production. However, the overall olive biomass potential yet seems to be under-valorized. A more radical and systemic change will be needed for effective implementation of circular business models contributing to sustainable development in the Mediterranean olive sector, with adequate subsidies, common regulations, more collective actions for creating economies of scale, and marketing strategies to increase consumer awareness for bio-based products.

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    Authors: Queffelec, Betty; Bonnin, Marie; Ferreira, Beatrice; Bertrand, Sophie; +7 Authors

    International audience; Ocean grabbing occurs when traditional users, such as small-scale fishers, are pushed aside by new development activities. This grabbing must be prevented to avoid sea uses that maintain or increase social inequity. In this paper, we show that in tropical Atlantic countries, such as Brazil and Senegal, examples of ocean grabbing already occur. In this context, we analyse if Maritime Spatial Planning (MSP) may be an opportunity to limit ocean grabbing or, to the contrary, poses a risk to increase it. MSP calls for an ecosystem approach that requires integrated coastal and marine management and involves stakeholders in developing a shared vision of the future, where society and environment are preserved. However, recent studies have shown that MSP is a process to be used cautiously to ensure equitable decisions. Meanwhile, the concept is spreading worldwide including in tropical Atlantic countries. We highlight that context matters and the specificities of the tropical Atlantic must be taken into account when deploying MSP processes. In the tropical Atlantic context, there is increased imbalances of stakeholder power, traps from decision support tools, and a need for adaptive management. These specific features must be addressed when deploying MSP in a way to avoid ocean grabbing.

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    Other literature type . Article . 2021
    License: CC BY
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  • Authors: Dragna, Didier; Emmanuelli, Ariane; Ollivier, S.; Blanc-Benon, Philippe;

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  • Authors: Deleplanque, Samuel; Hosteins, Pierre; Pellegrini, Paola; Rodriguez, Joaquin;

    International audience; This paper treats theoretical and practical aspects of train management in freight shunting yards. It is a literature survey extending the previous ones and presenting the new important papers published in the last decade. The operations realised in such yards are formalised by modelling them in unified modelling language diagrams and the algorithms implemented to solve the optimisation problems of operations management for the different types of freight shunting yards and for the existing models are presented. The details on real yards that can be found in the literature are also reported, to allow the reader understanding what case studies can be actually tackled with the existing methods.

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  • Authors: Dragna, Didier; Emmanuelli, Ariane; Ollivier, S.; Blanc-Benon, Philippe;

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    Authors: Olivier, Léa; Boutin, Jacqueline; Reverdin, Gilles; Lefèvre, Nathalie; +8 Authors

    The key processes driving the air–sea CO2 fluxes in the western tropical Atlantic (WTA) in winter are poorly known. WTA is a highly dynamic oceanic region, expected to have a dominant role in the variability in CO2 air–sea fluxes. In early 2020 (February), this region was the site of a large in situ survey and studied in wider context through satellite measurements. The North Brazil Current (NBC) flows northward along the coast of South America, retroflects close to 8∘ N and pinches off the world's largest eddies, the NBC rings. The rings are formed to the north of the Amazon River mouth when freshwater discharge is still significant in winter (a time period of relatively low run-off). We show that in February 2020, the region (5–16∘ N, 50–59∘ W) is a CO2 sink from the atmosphere to the ocean (−1.7 Tg C per month), a factor of 10 greater than previously estimated. The spatial distribution of CO2 fugacity is strongly influenced by eddies south of 12∘ N. During the campaign, a nutrient-rich freshwater plume from the Amazon River is entrained by a ring from the shelf up to 12∘ N leading to high phytoplankton concentration and significant carbon drawdown (∼20 % of the total sink). In trapping equatorial waters, NBC rings are a small source of CO2. The less variable North Atlantic subtropical water extends from 12∘ N northward and represents ∼60 % of the total sink due to the lower temperature associated with winter cooling and strong winds. Our results, in identifying the key processes influencing the air–sea CO2 flux in the WTA, highlight the role of eddy interactions with the Amazon River plume. It sheds light on how a lack of data impeded a correct assessment of the flux in the past, as well as on the necessity of taking into account features at meso- and small scales.

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    Authors: Erraach, Yamna; Jaafer, Fatma; Radić, Ivana; Donner, Mechthild;

    International audience; Product labeling is a way to inform consumers and increase their awareness about sustainability attributes of products. It guarantees the use of specific production conditions, promotes market incentives and highlights environmental, social and/or ethical product attributes. This study provides a literature review of sustainability labels on olive oil including consumer attitudes and behavior towards this product. Results show that consumers have positive attitudes towards olive oil carrying sustainability labels and are willing to pay more for olive oil carrying those labels. However, the major drivers of this behavior are far from being related to sustainability. This insight jeopardizes the main objective of those labels and suggests more clarifications about the information delivered by them. More in-depth investigations are needed about the drivers of consumer behavior towards olive oil carrying sustainability labels.

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    Sustainability
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    Authors: Kurtz, Amélie; Thomopoulos, Rallou;

    Context. In line with Sustainable Development Goals 3 “Good health and well-being” and 12 “Responsible Consumption and Production”, this paper is concerned with the fragile population of the less-than-3-years-old children. More specifically, it investigates how infant food safety is perceived at the household level and at the level of childhood and health professionals directly in contact with them. Objective. The paper aims to analyze consumer priorities and perceptions of hazards in infant foods qualitatively and quantitatively. Methodology. To do so, a survey was carried out in France on 1750 people representative of the general population. A hybrid method is proposed to analyze the results of the survey, mixing artificial intelligence and statistics. Main insights. Within the declared priorities when choosing infant food, health comes first, with a top ranking for the absence of harmful substances, followed closely by nutritional balance—far ahead of environment, ease of use and price. The results show that the rankings of the hazards that cause the most worry are globally homogeneous throughout the populations (families, professionals, etc.) and higher for chemical contaminants from agricultural practices and packaging. For health professionals, concerns are higher than in the general population for all categories of contaminants, and specific concerns such as risk related to environmental and unknown contaminants are much more prevalent. The perception of risk varies with the food considered. For infant formula in particular, users seem puzzled by somehow contradictory messages. Perspectives. The study is intended to be generalized to Europe.

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    Sustainability
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    Authors: Bonifácio, Paulo; Neal, Lenka; Menot, Lenaick;

    International audience; The polymetallic nodules lying on the seafloor of the Clarion-Clipperton Fracture Zone (CCFZ) represent over 30 billion metric tons of manganese. A single mining operation has potential to directly impact approximately 200 km2 of the seabed per year. Yet, the biodiversity and functioning of the bentho-demersal ecosystem in the CCFZ remain poorly understood. Recent studies indicate a high species diversity in a food-poor environment, although the area remains poorly sampled. Undersampling is aggravated by a combination of low densities of fauna and high habitat heterogeneity at multiple spatial scales. This study examines the Polynoidae, a diverse family of mobile polychaetes. Sampling with an epibenthic sledge and a remotely operated vehicle was performed during the cruise SO239 within the eastern CCFZ. Five areas under the influence of a sea surface productivity gradient were visited. Specimens were identified using morphology and DNA: (i) to provide a more comprehensive account of polynoid diversity within the CCFZ, (ii) to infer factors potentially driving alpha and beta diversity, and (iii) to test the hypothesis that epibenthic polychaetes have low species turnover and large species range. Patterns of species turnover across the eastern CCFZ were correlated with organic carbon fluxes to the seafloor but there was also a differentiation in the composition of assemblages north and south of the Clarion fracture. In contrast to the previous studies, patterns of alpha taxonomic and phylogenetic diversity both suggest that polynoid assemblages are the most diverse at Area of Particular Environmental Interest no. 3, the most oligotrophic study site, located north of the Clarion fracture. Without ruling out the possibility of sampling bias, the main hypothesis explaining such high diversity is the diversification of polynoid subfamily Macellicephalinae, in response to oligotrophy. We propose that macellicephalins evolved under extremely low food supply conditions through adoption of a semi-pelagic mode of life, which enabled them to colonise new niches at the benthic boundary layer and foster their radiation at great depths.

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  • Authors: Emmanuelli, Ariane; Dragna, Didier; Ollivier, Sébastien; Blanc-Benon, Philippe;

    International audience; The influence of topography on sonic boom propagation is investigated. The full two-dimensional Euler equations in curvilinear coordinates are solved using high-order finite-difference time-domain techniques. Simple ground profiles, corresponding to a terrain depression, a hill, and a sinusoidal terrain, are examined for two sonic boom waves: a classical N-wave and a low-boom. Ground reflection of the sonic boom is affected by elevation variations: a concave ground profile induces compression, which tends to increase the peak pressure in particular, while the opposite is true for convex elevation variations, which lead to expansion and a reduction in peak pressure. The reflected boom is then strongly altered. Furthermore, a sufficiently concave topography can cause focal zones, which generate extra contributions at ground level in the form of U-waves in addition to the reflected wave. This mechanism has the largest effect on waveforms at ground level. The variations of standard metrics are of a few dBs compared to a flat ground for both sonic boom waves, and they are notably greater for the terrain depression than for the hill. Finally, in the case of a sinusoidal terrain, the pressure waveforms are composed of multiple arrivals due to successive focal zones.

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    Authors: Donner, Mechthild; Radić, Ivana;

    International audience; Considering the large amounts of harmful waste produced in the Mediterranean olive sector, entrepreneurial initiatives creating value from olive waste and by-products via circular bio-economy approaches are reviewed. These circular business models aim to enhance the functionality use of olive trees beyond traditional patterns for value creation. The study focuses on business drivers and value creation mechanisms, and specifically on conversion pathways of olive waste towards new value propositions. In total, 41 cases are analyzed mainly according to the Business Model Canvas components with NVivo, based on data gathered from an extensive online search mainly of company websites and reports, online articles, research project reports, professional websites, and newsletters. Results indicate that some innovative businesses have emerged specializing in the domain of olive waste valorization, driven by environmental concerns and mainly focusing on bioenergy production. However, the overall olive biomass potential yet seems to be under-valorized. A more radical and systemic change will be needed for effective implementation of circular business models contributing to sustainable development in the Mediterranean olive sector, with adequate subsidies, common regulations, more collective actions for creating economies of scale, and marketing strategies to increase consumer awareness for bio-based products.

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    Sustainability
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    Authors: Queffelec, Betty; Bonnin, Marie; Ferreira, Beatrice; Bertrand, Sophie; +7 Authors

    International audience; Ocean grabbing occurs when traditional users, such as small-scale fishers, are pushed aside by new development activities. This grabbing must be prevented to avoid sea uses that maintain or increase social inequity. In this paper, we show that in tropical Atlantic countries, such as Brazil and Senegal, examples of ocean grabbing already occur. In this context, we analyse if Maritime Spatial Planning (MSP) may be an opportunity to limit ocean grabbing or, to the contrary, poses a risk to increase it. MSP calls for an ecosystem approach that requires integrated coastal and marine management and involves stakeholders in developing a shared vision of the future, where society and environment are preserved. However, recent studies have shown that MSP is a process to be used cautiously to ensure equitable decisions. Meanwhile, the concept is spreading worldwide including in tropical Atlantic countries. We highlight that context matters and the specificities of the tropical Atlantic must be taken into account when deploying MSP processes. In the tropical Atlantic context, there is increased imbalances of stakeholder power, traps from decision support tools, and a need for adaptive management. These specific features must be addressed when deploying MSP in a way to avoid ocean grabbing.

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    Other literature type . Article . 2021
    License: CC BY
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