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Influence of Summer Sublimation on δD, δ 18 O, and δ 17 O in Precipitation, East Antarctica, and Implications for Climate Reconstruction From Ice Cores

Hongxi Pang 1 Shugui Hou 2 Amaëlle Landais 3, 4 Valérie Masson-Delmotte 3, 4 Jean Jouzel 3, 4 Hans Steen-Larsen Camille Risi 5 Wangbin Zhang Shuangye Wu Yuansheng Li Chunlei An 6 Yetang Wang Frederic Prie 3, 4 Bénédicte Minster 3, 4 Sonia Falourd 3, 4 Barbara Stenni Claudio Scarchilli Koji Fujita Paolo Grigioni
1 The State Key Laboratory of Cryosphere Science
2 State Key Laboratory of Cryospheric Sciences
3 LSCE - Laboratoire des Sciences du Climat et de l'Environnement [Gif-sur-Yvette]
4 GLACCIOS - Glaces et Continents, Climats et Isotopes Stables
LSCE - Laboratoire des Sciences du Climat et de l'Environnement [Gif-sur-Yvette] : DRF/LSCE
5 LMD - Laboratoire de Météorologie Dynamique (UMR 8539)
6 Technical University Hamburg Harburg [Hamburg]
Abstract : In central Antarctica, where accumulation rates are very low, summer sublimation of surface snow is a key element of the surface mass balance, but its fingerprint in isotopic composition of water (δD, δ 18 O, and δ 17 O) remains unclear. In this study, we examined the influence of summer sublimation on δD, δ 18 O, and δ 17 O in precipitation using data sets of isotopic composition of precipitation at various sites on the inland East Antarctica. We found unexpectedly low δ 18 O values in the summer precipitation, decoupled from surface air temperatures. This feature can be explained by the combined effects of weak or nonexistent temperature inversion and moisture recycling associated with sublimation-condensation processes in summer. Isotopic fractionation during the moisture-recycling process also explains the observed high values of d-excess and 17 O-excess in summer precipitation. Our results suggest that the local cycle of sublimation-condensation in summer is an important process for the isotopic composition of surface snow, water vapor, and consequently precipitation on inland East Antarctica.
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Submitted on : Tuesday, November 5, 2019 - 10:06:24 AM
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INSU | X-LMD | UVSQ | CNRS | CEA | CEA-UPSAY | LSCE | X | ENPC | X-DEP-MECA | SORBONNE-UNIVERSITE | PARISTECH | SU-SCIENCES | IP_PARIS | UNIV-PARIS-SACLAY | LSCE-CEA | PSL | SU-TI | GS-ENGINEERING | GS-BIOSPHERA | GS-GEOSCIENCES | CEA-DRF | INSTITUT-SCIENCES-LUMIERE

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Hongxi Pang, Shugui Hou, Amaëlle Landais, Valérie Masson-Delmotte, Jean Jouzel, et al.. Influence of Summer Sublimation on δD, δ 18 O, and δ 17 O in Precipitation, East Antarctica, and Implications for Climate Reconstruction From Ice Cores. Journal of Geophysical Research: Atmospheres, American Geophysical Union, 2019, 124 (13), pp.7339-7358. ⟨10.1029/2018JD030218⟩. ⟨insu-02346785⟩

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