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| Author | Christopher Burot, Rémi Amiraux, Patricia Bonin, Sophie Guasco, Marcel Babin, Fabien Joux, Dominique Marie, Laure Vilgrain, Hermann J. Heipieper, Jean-François Rontani | ||||
Title  |
Viability and stress state of bacteria associated with primary production or zooplankton-derived suspended particulate matter in summer along a transect in Baffin Bay (Arctic Ocean) | Type | Journal | ||
| Year | 2021 | Publication | Science of The Total Environment | Abbreviated Journal | |
| Volume | 770 | Issue | Pages | 145252 | |
| Keywords | Bacterial viability EPS isomerase Micro- and macro-zooplankton Salinity stress Sea ice algae | ||||
| Abstract | In the framework of the GreenEdge Project (whose the general objective is to understand the dynamic of the phytoplankton spring bloom in Arctic Ocean), lipid composition and viability and stress state of bacteria were monitored in sea ice and suspended particulate matter (SPM) samples collected in 2016 along a transect from sea ice to open water in Baffin Bay (Arctic Ocean). Lipid analyses confirmed the dominance of diatoms in the bottommost layer of ice and suggested (i) the presence of a strong proportion of micro-zooplankton in SPM samples collected at the western ice covered St 403 and St 409 and (ii) a high proportion of macro-zooplankton (copepods) in SPM samples collected at the eastern ice covered St 413 and open water St 418. The use of the propidium monoazide (PMA) method allowed to show a high bacterial mortality in sea ice and in SPM material collected in shallower waters at St 409 and St 418. This mortality was attributed to the release of bactericidal free fatty acids by sympagic diatoms under the effect of light stress. A strong cis-trans isomerization of bacterial MUFAs was observed in the deeper SPM samples collected at the St 403 and St 409. It was attributed to the ingestion of bacteria stressed by salinity in brine channels of ice by sympagic bacterivorous microzooplankton (ciliates) incorporating trans fatty acids of their preys before to be released in the water column during melting. The high trans/cis ratios also observed in SPM samples collected in the shallower waters at St 413 and St 418 suggest the presence of positively or neutrally buoyant extracellular polymeric substances (EPS)-rich particles retained in sea ice and discharged (with bacteria stressed by salinity) in seawater after the initial release of algal biomass. Such EPS particles, which are generally considered as ideal vectors for bacterial horizontal distribution in the Arctic, appeared to contain a high proportion of dead and non-growing bacteria. | ||||
| Programme | 1164 | ||||
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| ISSN | 0048-9697 | ISBN | Medium | ||
| Area | Expedition | Conference | |||
| Notes | Approved | yes | |||
| Call Number | Serial | 8253 | |||
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| Author | F. R. Fontaine, G. Roult, B. Hejrani, L. Michon, V. Ferrazzini, G. Barruol, H. Tkalčić, A. Di Muro, A. Peltier, D. Reymond, T. Staudacher, F. Massin | ||||
| Title |
Very- and ultra-long-period seismic signals prior to and during caldera formation on La Réunion Island | Type | Journal | ||
| Year | 2019 | Publication | Scientific Reports | Abbreviated Journal | |
| Volume | 9 | Issue | 1 | Pages | 1-15 |
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| Abstract | Early detection of the onset of a caldera collapse can provide crucial information to understand their formation and thus to minimize risks for the nearby population and visitors. Here, we analyse the 2007 caldera collapse of Piton de la Fournaise on La Réunion Island recorded by a broadband seismic station. We show that this instrument recorded ultra-long period (ULP) signals with frequencies in the range (0.003–0.01 Hz) accompanied by very-long period (VLP) signals (between 0.02 and 0.50 Hz) prior to and during the caldera formation suggesting it is possible to detect the beginning of the collapse at depth and anticipate its surface formation. Interestingly, VLP wave packets with a similar duration of 20 s are identified prior to and during the caldera formation. We propose that these events could result from repeating piston-like successive collapses occurring through a ring-fault structure surrounding a magma reservoir from the following arguments: the source mechanism from the main collapse, the observations of slow source processes as well as observations from the field and the characteristic ring-fault seismicity. | ||||
| Programme | 133 | ||||
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| ISSN | 2045-2322 | ISBN | 2045-2322 | Medium | |
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| Notes | Approved | yes | |||
| Call Number | Serial | 7514 | |||
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| Author | Gallet J-C, Domine F, Arnaud L, Picard G, Savarino J, | ||||
| Title |
Vertical profile of the specific surface area and density of the snow at Dome C and on a transect to Dumont D'Urville, Antarctica – albedo calculations and comparison to remote sensing products | Type | Book Chapter | ||
| Year | 2011 | Publication | The Cryosphere | Abbreviated Journal | |
| Volume | 5 | Issue | 3 | Pages | 631 -649 |
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| Abstract | The specific surface area (SSA) of snow determines in part the albedo of snow surfaces and the capacity of the snow to adsorb chemical species and catalyze reactions. Despite these crucial roles, almost no value of snow SSA are available for the largest permanent snow expanse on Earth, the Antarctic. We report the first extensive study of vertical profiles of snow SSA near Dome C (DC: 75°06' S, 123°20' E, 3233 m a.s.l.) on the Antarctic plateau, and at seven sites during the logistical traverse between Dome C and the French coastal base Dumont D'Urville (DDU: 66°40' S, 140°01' E) during the Austral summer 2008–2009. We used the DUFISSS system, which measures the IR reflectance of snow at 1310 nm with an integrating sphere. At DC, the mean SSA of the snow in the top 1 cm is 38 m2 kg−1, decreasing monotonically to 14 m2 kg−1 at a depth of 50 cm. Along the traverse, the snow SSA profile is similar to that at DC in the first 600 km from DC. Closer to DDU, the SSA of the top 5 cm is 23 m2 kg−1, decreasing to 19 m2 kg−1 at 50 cm depth. This difference is attributed to wind, which causes a rapid decrease of surface snow SSA, but forms hard windpacks whose SSA decrease more slowly with time. Since light-absorbing impurities are not concentrated enough to affect albedo, the vertical profiles of SSA and density were used to calculate the spectral albedo of the snow for several realistic illumination conditions, using the DISORT radiative transfer model. A preliminary comparison with MODIS data is presented and our calculations and MODIS data show similar trends. | ||||
| Programme | 1011 | ||||
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| Corporate Author | Thesis | Bachelor's thesis | |||
| Publisher | Copernicus Publications | Place of Publication | Editor | ||
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| ISSN | 1994-0424 | ISBN | Medium | ||
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| Notes | Approved | yes | |||
| Call Number | Serial | 663 | |||
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| Author | Moore, C., Helmig, D., Fain, X., Obrist, D., Barbero, A., Barret, M., Van Dam, B., Dommergue, A., Hueber, J., Magand, O., Mass, A., Pirrone, N., Savarino, J., Seok, B., Sprovieri, F., Stephens, C., Williams, M., 2013. | ||||
| Title |
Vertical gaseous elemental mercury concentration gradients, mercury redox processes, and surface exchanges in alpine and polar snowpacks. | Type | Conference - International - Communication | ||
| Year | 2013 | Publication | Abbreviated Journal | ||
| Volume | Issue | Pages | |||
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| Abstract | The 11th International Conference on Mercury as a Global Pollutant (ICMGP), Edinburgh, Scotland, 28 July-2 August. | ||||
| Programme | 1028 | ||||
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| Notes | Approved | yes | |||
| Call Number | Serial | 4552 | |||
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| Author | Amalvict M. and de Linage C. | ||||
| Title |
Vertical displacement and variation of gravity predicted and observed in Antarctica | Type | Conference - International - Communication | ||
| Year | 2004 | Publication | Abbreviated Journal | ||
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| Abstract | SCAR Open Science, Bremen, Germany | ||||
| Programme | 337 | ||||
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| Notes | Approved | yes | |||
| Call Number | Serial | 3451 | |||
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| Author | Lambotte S, Rivera L, Hinderer J | ||||
| Title |
Vertical and horizontal seismometric observations of tides | Type | Journal Article | ||
| Year | 2006 | Publication | Journal of geodynamics | Abbreviated Journal | |
| Volume | 41 | Issue | Pages | 39-58 | |
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| Programme | 133;906 | ||||
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| Series Volume | Series Issue | Edition | |||
| ISSN | 0264-3707 | ISBN | Medium | ||
| Area | Expedition | Conference | |||
| Notes | Approved | yes | |||
| Call Number | Serial | 3368 | |||
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| Author | Tranchant Y.-T. | ||||
| Title |
Vers une meilleure exploitation de l’altimétrie côtière : apports combinés de la modélisation hydrodynamique à haute-résolution et des nouvelles techniques de cartographie du niveau marin par GNSS /// Towards a better use of coastal altimetry : contributions of hydrodynamic modelling and new GNSS techniques | Type | Thesis | ||
| Year | 2022 | Publication | Université de La Rochelle. Sous la direction de Valérie Ballu et de Laurent Testut. | Abbreviated Journal | |
| Volume | Issue | Pages | |||
| Keywords | Altimétrie côtière Coastal altimetry Drone marin Drones -- Mer GNSS Hydrodynamic modelling Littoraux -- France Localisation par satellites, Systèmes de Marine drone Mer -- Niveau -- Mesure Modélisation hydrodynamique | ||||
| Abstract | La mesure du niveau de la mer par satellite a atteint un niveau sans précédent en termes de précision et de couverture spatio-temporelle. Ces observations nous ont permis d'améliorer notre compréhension de la dynamique à grande échelle des océans, mais leur exploitation reste un défi à l’approche de la côte, où les incertitudes liées à la marée océanique et aux fines échelles du géoïde sont plus importantes. L’objectif de cette thèse est de développer de nouvelles méthodologies s’appuyant sur les mesures mobiles du niveau de la mer par GNSS et la modélisation hydrodynamique afin de mieux exploiter les mesures altimétriques côtière et de préparer l’arrivée des futures missions. Lors d’une campagne menée avec le drone marin PAMELi en Juillet 2020 dans les Pertuis Charentais, une cartographie du niveau marin est réalisée le long d’un itinéraire préprogrammé. Cette cartographie est exploitée afin d’évaluer un modèle de marée sous une trace altimétrique, et démontrer le potentiel d’un drone pour étendre spatialement nos capacités de validation. Par la suite, on estime les pentes de géoïde dans la zone à partir du même jeu de données, en combinant mesures in-situ et modèle hydrodynamique. On montre que la modélisation des gradients de topographie dynamique permet d’améliorer la précision de la cartographie des pentes de géoïde. Ces deux études exploitent une méthodologie basée sur les différences aux points de croisement, et offrent des perspectives sur l'utilisation des drones marins dans le contexte de la future mission SWOT. Enfin, on présente une méthode de prédiction du trait de côte basée sur l’utilisation d’un MNT et du modèle hydrodynamique, appliquée aux passage Sentinel-3A afin d’évaluer l’impact des bancs découvrant sur la mesure altimétrique. Dans leur ensemble, ces travaux constituent un socle méthodologique qui permettra de mieux comprendre et utiliser les mesures altimétriques dans les environnements côtiers, et préparer l’arrivée de la future mission SWOT. | ||||
| Programme | 688 | ||||
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| Notes | Approved | yes | |||
| Call Number | Serial | 8352 | |||
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| Author | Carole Ferret | ||||
| Title |
Vers une anthropologie de l’action. André-Georges Haudricourt et l’efficacité technique | Type | Journal Article | ||
| Year | 2012 | Publication | L'Homme | Abbreviated Journal | |
| Volume | Issue | 202 | Pages | p. 113-140 | |
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| Abstract | Résumé : Entre 1949 et 1995, André-Georges Haudricourt (1911-1996) a posé dans quelques travaux l’idée d’une opposition entre peuples pasteurs et jardiniers. Plusieurs auteurs soulignent la spécificité de la conception chinoise de l’efficacité. Nous proposons de reprendre et d’affiner la distinction opérée par Haudricourt entre action directe positive et action indirecte négative en vue de fonder une anthropologie de l’action dont il serait l’inventeur. En effet, l’étude des techniques d’élevage du cheval chez les Iakoutes de Sibérie, dans une civilisation à la fois pastorale et orientale, fournit l’occasion d’enrichir sa typologie de l’action, en distinguant notamment opérations et manipulations; actions passives et actions interventionnistes; actions endogènes, exogènes et participatives; actions continues et discontinues. Se focalisant sur le fonctionnement concret des actions humaines, une telle entreprise vise à comparer traitement de la nature et traitement d’autrui en examinant les modes d’agir.
Abstract: Toward an Anthropology of Action André-Georges Haudricourt and Technical Efficiency. In writings between 1949 and 1995, André-Georges Haudricourt (1911-1996) formulated the idea of an opposition between pastoralists and gardeners. Several writers have drawn attention to the Chinese conception of efficiency. In order to found an anthropology of action of which Haudricourt can be said to be the author, the distinction is addressed and reworked that he made between direct positive action and indirect negative action. The study of techniques for raising horses among the Yakuts in Siberia, a pastoral civilization in the East, provides an opportunity for developing this typology by distinguishing between: operations and manipulations; passive and interventionistic actions; endogenous, exogenous and participatory actions; or continuous and discontinuous actions. By focusing on how human actions actually function, we can compare the ways of handling nature and of handling people. |
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| Programme | 1057 | ||||
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| Notes | Approved | yes | |||
| Call Number | Serial | 4671 | |||
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| Author | CHANTELOUP L., JOLIET F. | ||||
| Title |
Vers un apprentissage mutuel, retour d’expérience sur la co-construction de savoirs, XIXe conférence Internationale Inuite, Qaumaniq le savoir qui illumine, Québec, 30 oct-1er novembre. | Type | Conference - International - Communication | ||
| Year | 2015 | Publication | Abbreviated Journal | ||
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| Programme | 1043 | ||||
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| Notes | Approved | yes | |||
| Call Number | Serial | 6243 | |||
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| Author | Jacqueline Oehri, Gabriela Schaepman-Strub, Jin-Soo Kim, Raleigh Grysko, Heather Kropp, Inge Grünberg, Vitalii Zemlianskii, Oliver Sonnentag, Eugénie S. Euskirchen, Merin Reji Chacko, Giovanni Muscari, Peter D. Blanken, Joshua F. Dean, Alcide di Sarra, Richard J. Harding, Ireneusz Sobota, Lars Kutzbach, Elena Plekhanova, Aku Riihelä, Julia Boike, Nathaniel B. Miller, Jason Beringer, Efrén López-Blanco, Paul C. Stoy, Ryan C. Sullivan, Marek Kejna, Frans-Jan W. Parmentier, John A. Gamon, Mikhail Mastepanov, Christian Wille, Marcin Jackowicz-Korczynski, Dirk N. Karger, William L. Quinton, Jaakko Putkonen, Dirk van As, Torben R. Christensen, Maria Z. Hakuba, Robert S. Stone, Stefan Metzger, Baptiste Vandecrux, Gerald V. Frost, Martin Wild, Birger Hansen, Daniela Meloni, Florent Domine, Mariska te Beest, Torsten Sachs, Aram Kalhori, Adrian V. Rocha, Scott N. Williamson, Sara Morris, Adam L. Atchley, Richard Essery, Benjamin R. K. Runkle, David Holl, Laura D. Riihimaki, Hiroki Iwata, Edward A. G. Schuur, Christopher J. Cox, Andrey A. Grachev, Joseph P. McFadden, Robert S. Fausto, Mathias Göckede, Masahito Ueyama, Norbert Pirk, Gijs de Boer, M. Syndonia Bret-Harte, Matti Leppäranta, Konrad Steffen, Thomas Friborg, Atsumu Ohmura, Colin W. Edgar, Johan Olofsson, Scott D. Chambers | ||||
| Title |
Vegetation type is an important predictor of the arctic summer land surface energy budget | Type | Journal | ||
| Year | 2022 | Publication | Nature Communications | Abbreviated Journal | |
| Volume | 13 | Issue | 1 | Pages | 6379 |
| Keywords | Atmospheric dynamics Climate and Earth system modelling Cryospheric science Ecosystem ecology Phenology | ||||
| Abstract | Despite the importance of high-latitude surface energy budgets (SEBs) for land-climate interactions in the rapidly changing Arctic, uncertainties in their prediction persist. Here, we harmonize SEB observations across a network of vegetated and glaciated sites at circumpolar scale (1994–2021). Our variance-partitioning analysis identifies vegetation type as an important predictor for SEB-components during Arctic summer (June-August), compared to other SEB-drivers including climate, latitude and permafrost characteristics. Differences among vegetation types can be of similar magnitude as between vegetation and glacier surfaces and are especially high for summer sensible and latent heat fluxes. The timing of SEB-flux summer-regimes (when daily mean values exceed 0 Wm−2) relative to snow-free and -onset dates varies substantially depending on vegetation type, implying vegetation controls on snow-cover and SEB-flux seasonality. Our results indicate complex shifts in surface energy fluxes with land-cover transitions and a lengthening summer season, and highlight the potential for improving future Earth system models via a refined representation of Arctic vegetation types. | ||||
| Programme | 1042 | ||||
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| Series Volume | Series Issue | Edition | |||
| ISSN | 2041-1723 | ISBN | Medium | ||
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| Notes | Approved | yes | |||
| Call Number | Serial | 8599 | |||
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