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. Antarctica is well known to be highly susceptible to atmospheric and oceanicwarming. However, due to the lack of long-term and in situ meteorologicalobservations, little is known about the magnitude of the warming and themeteorological conditions in the intersection region between the AntarcticPeninsula (AP), the West Antarctic Ice Sheet (WAIS) and the East AntarcticIce Sheet (EAIS). Here we present new stable water isotope data ( δ18O ,  δD ,  d  excess) and accumulation rates from firn cores in the Union Glacier (UG) region, located in the Ellsworth Mountains at thenorthern edge of the WAIS. The firn core stable oxygen isotopes and the  d  excess exhibit no statistically significant trend for the period 1980–2014, suggesting that regional changes in near-surface air temperature andmoisture source variability have been small during the last 35 years.Backward trajectory modelling revealed the Weddell Sea sector, Coats Landand Dronning Maud Land (DML) to be the main moisture source regions for the study site throughoutthe year. We found that mean annual  δ18O  ( δD ) valuesin the UG region are negatively correlated with sea ice concentrations (SICs) in the northern Weddell Sea but not influenced by large-scale modes ofclimate variability such as the Southern Annular Mode (SAM) and the ElNino–Southern Oscillation (ENSO). Only mean annual  d -excess values show a weak positive correlation with the SAM.   On average annual snow accumulation in the UG region amounts to 0.245 m w.e. a −1  in 1980–2014 and has slightly decreased during this period. Itis only weakly related to sea ice conditions in the Weddell Sea sector andnot correlated with SAM and ENSO.   We conclude that neither the rapid warming nor the large increases in snowaccumulation observed on the AP and in West Antarctica during the lastdecades have extended inland to the Ellsworth Mountains. Hence, the UGregion, although  located at the northern edge of the WAIS and relativelyclose to the AP, exhibits rather stable climate characteristics similar tothose observed in East Antarctica.

Stable water isotopes and accumulation rates in the Union Glacier region, Ellsworth Mountains, West Antarctica, over the last 35 years