Challenges associated with the climatic interpretation of water stable isotope records from a highly resolved firn core from Adélie Land, coastal Antarctica
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Published:2019-04-24
Issue:4
Volume:13
Page:1297-1324
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ISSN:1994-0424
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Container-title:The Cryosphere
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language:en
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Short-container-title:The Cryosphere
Author:
Goursaud SentiaORCID, Masson-Delmotte ValérieORCID, Favier VincentORCID, Preunkert SuzanneORCID, Legrand Michel, Minster Bénédicte, Werner MartinORCID
Abstract
Abstract. A new 21.3 m firn core was drilled in 2015 at a coastal Antarctic
high-accumulation site in Adélie Land (66.78∘ S; 139.56∘ E,
602 m a.s.l.), named Terre Adélie 192A (TA192A). The mean isotopic values (-19.3‰±3.1 ‰ for
δ18O and 5.4 ‰±2.2 ‰ for deuterium
excess) are consistent with other coastal Antarctic values. No significant
isotope–temperature relationship can be evidenced at any timescale. This
rules out a simple interpretation in terms of local temperature. An
observed asymmetry in the δ18O seasonal cycle may be explained
by the precipitation of air masses coming from the eastern and western
sectors in autumn and winter, recorded in the d-excess signal showing
outstanding values in austral spring versus autumn. Significant positive
trends are observed in the annual d-excess record and local sea ice extent
(135–145∘ E) over the period 1998–2014. However, process studies focusing on resulting isotopic compositions and
particularly the deuterium excess–δ18O relationship, evidenced
as a potential fingerprint of moisture origins, as well as the collection of
more isotopic measurements in Adélie Land are needed for an accurate
interpretation of our signals.
Publisher
Copernicus GmbH
Subject
Earth-Surface Processes,Water Science and Technology
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