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Alonzo F., Mayzaud P., Razouls S., Bocher P. & Cherel Y. (2003). Seasonal changes in biomass, growth rates and production of subantarctic calanoid copepods in the Bay of Morbihan, Kerguelen Islands. Mar. Biol., 142, 525–536.
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Alsina D., Snieder R. & Maupin V. (1993). A test of the great circle approximation in the analysis of surface waves. Geophysical research letters, 11, 633–636.
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Alvarez Marco, Koubbi Philippe. (2005). Spatial distribution of Pleuragramma antarticum larvae in The Dumont d’Urville Sea (East Antarctic shelf).
Abstract: stage de Master 1 Océanographie et Environnement Marin – Université Paris VI
Programme: 1142
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Amaelle Landais, Mathieu Casado, Frédéric Prié, Olivier Magand, Laurent Arnaud, Alexey Ekaykin, Jean-Robert Petit, Ghislain Picard, Michel Fily, Bénédicte Minster, Alexandra Touzeau, Sentia Goursaud, Valérie Masson-Delmotte, Jean Jouzel, Anaïs Orsi. (2017). Surface studies of water isotopes in Antarctica for quantitative interpretation of deep ice core data (Vol. 349). Bachelor's thesis, , .
Abstract: Polar ice cores are unique climate archives. Indeed, most of them have a continuous stratigraphy and present high temporal resolution of many climate variables in a single archive. While water isotopic records (δD or δ18O) in ice cores are often taken as references for past atmospheric temperature variations, their relationship to temperature is associated with a large uncertainty. Several reasons are invoked to explain the limitation of such an approach; in particular, post-deposition effects are important in East Antarctica because of the low accumulation rates. The strong influence of post-deposition processes highlights the need for surface polar research programs in addition to deep drilling programs. We present here new results on water isotopes from several recent surface programs, mostly over East Antarctica. Together with previously published data, the new data presented in this study have several implications for the climatic reconstructions based on ice core isotopic data: (1) The spatial relationship between surface mean temperature and mean snow isotopic composition over the first meters in depth can be explained quite straightforwardly using simple isotopic models tuned to d-excess vs. δ18O evolution in transects on the East Antarctic sector. The observed spatial slopes are significantly higher (∼ 0.7–0.8‰·°C−1 for δ18O vs. temperature) than seasonal slopes inferred from precipitation data at Vostok and Dome C (0.35 to 0.46‰·°C−1). We explain these differences by changes in condensation versus surface temperature between summer and winter in the central East Antarctic plateau, where the inversion layer vanishes in summer. (2) Post-deposition effects linked to exchanges between the snow surface and the atmospheric water vapor lead to an evolution of δ18O in the surface snow, even in the absence of any precipitation event. This evolution preserves the positive correlation between the δ18O of snow and surface temperature, but is associated with a much slower δ18O-vs-temperature slope than the slope observed in the seasonal precipitation. (3) Post-deposition effects clearly limit the archiving of high-resolution (seasonal) climatic variability in the polar snow, but we suggest that sites with an accumulation rate of the order of 40kg.m−2.yr−1 may record a seasonal cycle at shallow depths.
Keywords: Antarctica Ice core Water isotopes
Programme: 1028,1110
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Amalie Vigdel Ask, Bjørn Munro Jenssen, Sabrina Tartu, Frédéric Angelier, Olivier Chastel, Geir Wing Gabrielsen. (2021). Per- and Polyfluoroalkyl Substances Are Positively Associated with Thyroid Hormones in an Arctic Seabird (Vol. 40).
Abstract: Per- and polyfluoroalkyl substances (PFAS) are associated with several disrupted physiological and endocrine parameters. Regarding endocrine mechanisms, laboratory studies suggest that PFAS could disrupt the thyroid hormone system and alter circulating thyroid hormone concentrations. Thyroid hormones play a ubiquitous role—controlling thermoregulation, metabolism, and reproduction. However, evidence for disruption of thyroid hormones by PFAS remains scarce in wildlife. The present study investigated the associations between concentrations of PFAS, thyroid hormones, and body condition in an arctic seabird, the black-legged kittiwake (Rissa tridactyla). We collected blood from kittiwakes sampled in Svalbard, Norway (2013 and 2014). Plasma samples were analyzed for total thyroxine (TT4) and total triiodothyronine (TT3) concentrations; detected PFAS included branched and linear (lin) C8 perfluoroalkyl sulfonates (i.e., perfluoroctane sulfonate [PFOS]) and C9-C14 perfluoroalkyl carboxylates (PFCAs). The dominant PFAS in the kittiwakes were linPFOS and C11- and C13-PFCAs. Generally, male kittiwakes had higher concentrations of PFAS than females. We observed positive correlations between linPFOS, C10-PFCA, and TT4 in males, whereas in females C12-14-PFCAs were positively correlated to TT3. Interestingly, we observed contrasted correlations between PFAS and body condition; the direction of the relationship was sex-dependent. Although these results show relationships between PFAS and circulating thyroid hormone concentrations in kittiwakes, the study design does not allow for concluding on causal relationships related to effects of PFAS on the thyroid hormone system. Future experimental research is required to quantify this impact of PFAS on the biology of kittiwakes. The apparently different associations among PFAS and body condition for males and females are puzzling, and more research is required. Environ Toxicol Chem 2021;40:820–831. © 2020 The Authors. Environmental Toxicology and Chemistry published by Wiley Periodicals LLC on behalf of SETAC.
Keywords: Avian toxicity Ecotoxicology Endocrine-disrupting compounds Per- and polyfluoroalkyl substance Thyroid hormones
Programme: 330
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Amalvict M. (2003). Géodésie dans les Terres Australes et Antarctique Françaises (TAAF) – Mesures absolues de pesanteur, positionnement DORIS et GPS, Marégraphes. Présentation, premiers résultats et perspectives, Rapport quadriennal..
Abstract: CNFGG – Rapport quadriennal
Programme: 337
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Amalvict M. (2004). Gravity measurements in the French Antarctic and sub-Antarctic Territories from 1950 until now.
Abstract: SCAR Open Science, Bremen, Germany
Programme: 337
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Amalvict M. & Hinderer J. & Luck B. (2001). First absolute gravity measurements at the French station Dumont d'Urville (Antarctica). IAG Symposia, 123, 373–377.
Abstract: In M. Sideris (ed. ) Gravity Geoid and Geodynamics 2000 Springer Heidelberg.
Programme: 337
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Amalvict M. and de Linage C. (2004). Vertical displacement and variation of gravity predicted and observed in Antarctica.
Abstract: SCAR Open Science, Bremen, Germany
Programme: 337
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Amalvict M. et al. (2003). Gravity measurements in Antarctica: a review.
Abstract: 9th Symposium on Antarctic Earth Sciences, Potsdam
Programme: 337
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