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. A new 21.3 m firn core was drilled in 2015 at a coastal Antarctichigh-accumulation site in Adelie Land (66.78 ∘  S; 139.56 ∘  E,602 m a.s.l.), named Terre Adelie 192A (TA192A). The mean isotopic values ( - 19.3 ‰ ± 3.1  ‰ for δ18O and 5.4 ‰±2.2  ‰ for deuteriumexcess) are consistent with other coastal Antarctic values. No significantisotope–temperature relationship can be evidenced at any timescale. Thisrules out a simple interpretation in terms of local temperature. Anobserved asymmetry in the δ18O seasonal cycle may be explainedby the precipitation of air masses coming from the eastern and westernsectors in autumn and winter, recorded in the d -excess signal showingoutstanding values in austral spring versus autumn. Significant positivetrends 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 andparticularly the deuterium excess– δ18O relationship, evidencedas a potential fingerprint of moisture origins, as well as the collection ofmore isotopic measurements in Adelie Land are needed for an accurateinterpretation of our signals.

the cryosphere

Challenges associated with the climatic interpretation of water stable isotope records from a highly resolved firn core from Adélie Land, coastal Antarctica