Spatial distribution of 17O-excess in surface snow along a traverse from Zhongshan station to Dome A, East Antarctica

Hongxi Pang Shugui Hou Amaelle Landais 1 Valérie Masson-Delmotte 1 Frederic Prie 1 Hans Christian Steen-Larsen 1 Camille Risi 2 Yuansheng Li Jean Jouzel 1 Yetang Wang Jing He Bénédicte Minster 1 Sonia Falourd 1
1 LSCE - Laboratoire des Sciences du Climat et de l'Environnement [Gif-sur-Yvette]
2 LMD - Laboratoire de Météorologie Dynamique (UMR 8539)
Abstract : The influence of temperature on the triple isotopic composition of oxygen in water is still an open question and limits the interpretation of water isotopic profiles in Antarctic ice cores. The main limitation arises from the lack of 17O-excess measurements in surface snow and especially for remote regions characterized by low temperature and accumulation rate. In this study, we present new 17O-excess measurements of surface snow along an East Antarctic traverse, from the coastal Zhongshan station to the highest point of the Antarctic ice sheet at Dome A. The 17O-excess data significantly decrease inland, with a latitudinal gradient of −1.33±0.41 per meg/degree, an altitudinal gradient of View the MathML source, and a temperature gradient of View the MathML source. Theoretical calculations performed using a Rayleigh model attribute this inland decrease to kinetic isotopic fractionation occurring during condensation from vapor to ice under supersaturation conditions at low temperatures. However, large heterogeneity of 17O-excess in Antarctic precipitation cannot only be explained by temperature at condensation and/or influences of relative humidity in the moisture source region
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Submitted on : Wednesday, July 22, 2015 - 10:08:36 PM
Last modification on : Wednesday, May 15, 2019 - 3:53:39 AM

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Hongxi Pang, Shugui Hou, Amaelle Landais, Valérie Masson-Delmotte, Frederic Prie, et al.. Spatial distribution of 17O-excess in surface snow along a traverse from Zhongshan station to Dome A, East Antarctica. Earth and Planetary Science Letters, Elsevier, 2015, 414 (march), pp.126-133. ⟨10.1016/j.epsl.2015.01.014⟩. ⟨hal-01179573⟩

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