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Author |
Lassalle Coralie |
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Title |
Apport des isotopes de l’eau pour comprendre la dynamique climatique et le cycle hydrologique en Terre Adélie |
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Master 2 |
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2022 |
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Dans un contexte de réchauffement climatique, la compréhension de l’évolution passée et future du climat dans le monde représente un enjeu majeur, dans la mesure où la calotte Antarctique peut contribuer à la hausse du niveau marin de près de 60 m. De ce fait, il est important d’appréhender et de documenter la variabilité climatique récente impactant le bilan de masse de surface antarctique, plus spécifiquement dans les régions côtières. Néanmoins, les enregistrements issus des observations instrumentales et satellitaires sont bien trop courts pour faire la distinction entre la variabilité naturelle du signal climatique et l’impact anthropique. D’où le lancement du raid scientifique ASUMA (« Improving the Accurancy of SUrface Mass balance of Antarctica »), dans le cadre de l’ANR (« Agence Nationale de la Recherche »), en Terre Adélie, zone côtière à fort taux d’accumulation caractérisée par la présence de vents catabatiques, afin de mieux connaitre l’évolution actuelle du bilan de masse. Un volet du projet est d’analyser la composition isotopique des carottes de névé dans l’objectif de fournir des informations sur le cycle hydrologique atmosphérique et la dynamique climatique. D’ailleurs, Sentia GOURSAUD (2018) montre que, dans la région côtière de Terre Adélie, la composition isotopique ne dépend pas que de la température de surface locale mais qu’elle est aussi sous l’influence d’autres facteurs (dynamique atmosphérique, sources et transport de l’humidité, phénomènes post-déposition). Dans ce rapport, deux sites de forages de carottes courtes du programme ASUMA ont été étudiés dans l’objectif de faire un transect le long de la pente menant au haut plateau antarctique, entre les points D47 à 1550 m d’altitude et STOP_0 à 2460m. Les mesures isotopiques effectuées ont permis de reconstruire la variabilité climatique sur les 50 dernières années grâce à une méthode analytique continue, l’analyse en flux continu ou CFA (« Continuous Flow Analysis »). Bien que cette méthode soit utilisée en laboratoire depuis quelques années, elle a été récemment développée au LSCE sur les carottes de névé. |
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8493 |
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Lavrillier, A., L. Egorova, S. Gabyshev |
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Title |
Der Klimawandel aus Sicht der Wissenschaft der sibirischen indigenen Bevölkerung (Evenken) |
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2022 |
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In E. Kasten Mensch und Natur in Sibirien: Umweltw |
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Fürstenberg/Havel: Kulturstiftung Sibirien |
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121-161 |
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a chapter in a peer-reviewed edited volume volume |
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1127 |
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978-3-942883-74-0 |
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8518 |
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Lavrillier, A., L. Egorova, S. Gabyshev |
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Izmeneniye klimata s tochki zreniya nauki korennykh narodov Sibiri (evenkov) [Climate change from the point of view of science of the indigenous peoples of Siberia (Evenks)] |
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2022 |
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In E. Kasten Chelovek i priroda v Sibiri: Ekologic |
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Fürstenberg/Havel: Kulturstiftung Sibirien |
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121-161 |
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Chapter peer-reviewed edited volumes |
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1127 |
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978-3-942883-75-7 |
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8522 |
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Pierre Stephan, Lancelot Massé, David Dider, Ronan Autret, Antoine Soloy, Serge Suanez |
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Title |
Pluri-annual morphological and sedimentological changes of the Valahnúkur boulder barrier, SW Iceland |
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Peer-reviewed symposium |
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2022 |
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10th iag international conference of geomorphology, 12-16 september 2022, coimbra (portugal) |
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While recent studies highlighted the great mobility of boulder beaches related to the impact of storm waves, numerous researches are still needed to better understand the morphodynamic of coastal boulder accumulations. This paper provides original data about pluri-annual morphological and sedimentological changes, as well as storm-induced geomorphic processes and their impact on the Valahnúkur boulder barrier, in the south-west of Iceland. First described by Etienne & Paris (2010), this massive accumulation of boulders shows numerous evidences of coastal barrier flooding and intense boulder mobility. Between May 2015 and May 2021, a topo-morphological survey was undertaken to analyze and quantify both cross-shore and longshore morphosedimentary processes of the Valahnúkur boulder barrier and surrounding areas. Annual campaigns of UAV (Unmanned Aerial Vehicle) flights were conducted in order to produce a set of Digital Elevation Models (DEMs) and Orthophotographs using Structure-from-Motion photogrammetry. DEMs were compared to deduce the morphological changes. Orthophotographs were analyzed from a deep learning-based method to estimate the changes in the spatial distribution of boulder sizes. Hydrodynamic conditions were reconstructed using wave buoy and tide gauge measurements. Wave runup were calibrated from the analysis of a wave/swash motion data set acquired by video monitoring related to different hydrodynamic conditions. The chronology of extreme water levels has been reconstructed on this high refective beach to estimate the elevation of the wave action during the survey period. From the sediment budget calculation, a significant northward longshore drift of around 1000 m3/a is highlighted on the beachface. The ridge and back-barrier areas were dominated by accretion related to cross-shore boulder transport from the beach. The volume of transported boulders is highly variable according to hydrodynamic conditions. Although the morphogenic impact of winter storms is difficult to assess, the observed morphological changes suggest processes dominated by swash, overtopping and overwash. The boulder size analysis highlights a link between the boulders mass and their movement landward. Video monitoring indicates that the amplitude of the swash is quite similar whether the hydrodynamic conditions are normal or energetic. The high porosity of the barrier appears to be a key factor in the dissipation of wave energy. |
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1216 |
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ICG2022-359 |
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8409 |
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Denis Mercier, Emilie Portier, Armelle Decaulne, Etienne Cossart |
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Deep-seated gravitational slope deformation and rock-slope failures deposits in Iceland: inventory, dating and role in landscape evolution |
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Communication |
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2022 |
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10th International Conference on Geomorphology, ICG2022-165, Coimbra, 12-16 september 2022 |
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1266 |
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8467 |
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Lewden, A, Ward, C, Avril, S, Abolivier, L, Gérard, C, Hammer, Tl, Robin, J-p, Viblanc, Va, Bize, P, And Stier, A. |
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Surface temperatures are influenced by handling stress independently of glucocorticoid levels in wild king penguins. |
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Peer-reviewed symposium |
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2022 |
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18émes journées scientifiques du CNFRA, 11-12 mai 2022, Toulouse, France |
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8477 |
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Téchiné P., L. Testut, M. Calzas, A. Guillot, C. Drezen, C. Brachet, L. Fichen, T. Donal, V. Kérébel. |
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Réseau d’Observation Subantarctique et Antarctique du niveau de la MEr |
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Peer-reviewed symposium |
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2022 |
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18émes journées scientifiques du CNFRA, 11-12 mai 2022, Toulouse, France |
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8478 |
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Fillion D., Dominé F., Couture R.M. |
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Shedding Light on a Dark Lake: How the Sun Transforms the Chemistry of Lakes |
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2022 |
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2022 arctic circle assembly, 13-16 octobre 2022, reykjavÃk, islande |
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8694 |
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Gilg, O., Hansen, L.H., Schmidt, N.M., Lang, J., Sittler, B., Sokolov, A., Sokolova, N., Fufachev, I., Ehrich, D., Forin-Wiart, M.-A., Bédard, A., Lecomte, N., Sabard, B., Pletenev, A., Gilg, V., Sabard, C., Meyer, N., Berteaux, D. & Bollache, L. |
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Predator-prey interactions between the arctic fox and tundra nesting birds in space and time: first results of an ongoing circumpolar initiative |
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2022 |
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6th international conference in Arctic Fox Conference 2022, 26-29 August 2022, Longyearbyen, Svalbard |
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1036 |
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8658 |
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Ungar, P.S., Van Valkenburgh, B., Peterson, A.S., Sokolov, A.A., Sokolova, N.A., Ehrich, D., Fufachev, I.A., Gilg, O., Terekhina, A., Volkovitskiy, A. & Shtro, V. |
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Dental ecology reflects diet in arctic foxes |
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Peer-reviewed symposium |
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2022 |
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6th international conference in Arctic Fox Conference 2022, 26-29 August 2022, Longyearbyen, Svalbard |
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8656 |
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