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Influence of Summer Sublimation on δD, δ18O, and δ17O in Precipitation, East Antarctica, and Implications for Climate Reconstruction From Ice Cores

TitoloInfluence of Summer Sublimation on δD, δ18O, and δ17O in Precipitation, East Antarctica, and Implications for Climate Reconstruction From Ice Cores
Tipo di pubblicazioneArticolo su Rivista peer-reviewed
Anno di Pubblicazione2019
AutoriPang, H., Hou S., Landais A., Masson-Delmotte V., Jouzel J., Steen-Larsen H.C., Risi C., Zhang W., Wu S., Li Y., An C., Wang Y., Prie F., Minster B., Falourd S., Stenni B., Scarchilli Claudio, Fujita K., and Grigioni P.
RivistaJournal of Geophysical Research: Atmospheres
Volume124
Paginazione7339-7358
ISSN2169897X
Parole chiaveair temperature, antarctica, East Antarctica, glacier mass balance, Ice core, isotopic composition, oxygen isotope, paleoclimate, precipitation (climatology), reconstruction, snow accumulation, stable isotope, Sublimation, summer
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, δ18O, and δ17O) remains unclear. In this study, we examined the influence of summer sublimation on δD, δ18O, and δ17O in precipitation using data sets of isotopic composition of precipitation at various sites on the inland East Antarctica. We found unexpectedly low δ18O 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 17O-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. ©2019. American Geophysical Union. All Rights Reserved.

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cited By 12

URLhttps://www.scopus.com/inward/record.uri?eid=2-s2.0-85068445579&doi=10.1029%2f2018JD030218&partnerID=40&md5=53fb90bbff5bc07c856a823034adbfab
DOI10.1029/2018JD030218
Citation KeyPang20197339