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Author |
Camille Bréant, Christophe Leroy Dos Santos, Cécile Agosta, Mathieu Casado, Elise Fourré, Sentia Goursaud, Valérie Masson-Delmotte, Vincent Favier, Olivier Cattani, Frédéric Prié, Benjamin Golly, Anaïs Orsi, Patricia Martinerie, Amaëlle Landais |
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Title |
Coastal water vapor isotopic composition driven by katabatic wind variability in summer at Dumont d'Urville, coastal East Antarctica |
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Year  |
2019 |
Publication |
Earth and Planetary Science Letters |
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Volume |
514 |
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Pages |
37-47 |
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Keywords |
Antarctica katabatic wind water isotopes |
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Abstract |
Dumont d'Urville station, located on the East coast of Antarctica in Adélie Land, is in one of the windiest coastal region on Earth, due to katabatic winds downslope from the East Antarctic ice sheet. In summer, the season of interest in this study, coastal weather is characterized by well-marked diel cycles in temperature and wind patterns. Our study aims at exploring the added value of water vapor stable isotopes in coastal Adélie Land to provide new information on the local atmospheric water cycle and climate. An important application is the interpretation of water isotopic profiles in snow and ice cores recently drilled in Adélie Land. We present the first continuous measurements of δ18O and d-excess in water vapor over Adélie Land. During our measurements period (26/12/2016 to 03/02/2017), we observed clear diel cycles in terms of temperature, humidity and isotopic composition. The cycles in isotopic composition are particularly large given the muted variations in temperature when compared to other Antarctic sites where similar monitoring have been performed. Based on data analyses and simulations obtained with the regional MAR model on the coastal Adélie Land, we suggest that the driver for δ18O and d-excess diel variability in summer at Dumont d'Urville is the variation of the strength of the wind coming from the continent: the periods with strong wind are associated with the arrival of relatively dry air with water vapor associated with low δ18O and high d-excess from the Antarctic plateau. Finally, in addition to the interpretation of snow and ice core isotopic profiles in the coastal regions, our study has implications for the evaluation of atmospheric models equipped with water isotopes. |
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Programme |
411,1205 |
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Thesis |
Bachelor's thesis |
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ISSN |
0012-821X |
ISBN |
0012-821X |
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Approved |
yes |
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Call Number |
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Serial |
7465 |
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