A decade (2008–2017) of water stable-isotope composition of precipitation at Concordia Station, East Antarctica

A ten-year record of oxygen and hydrogen isotopic composition of precipitation is here presented: from 2008 to 2017, 1483 daily precipitation samples were collected all-year round on a raised platform at Concordia Station, East Antarctica. Weather data were retrieved from the Italian Antarctic Meteo-Climatological Observatory AWS, while ERA5 was used to estimate total precipitation. The δ-temperature relationships were moderately high for daily data (r ²=0.63 and 0.64 for δ ¹⁸O and δ ²H, respectively) and stronger using monthly data (r ²=0.82 for both δ ¹⁸O and δ ²H), with a slope of about 0.5 ‰/°C for δ ¹⁸O/T _AWS (3.5 ‰/°C for δ ¹⁸O/T _AWS), which remains consistent also using annual averages. The isotopic composition of precipitation is the input signal of the snow/ice system and this dataset will be useful to improve the interpretation of paleoclimate records and promote a better understanding of the post-depositional processes affecting the isotopic signal in ice cores. Isotope-enabled GCM ECHAM6-wiso output for the isotopic composition of precipitation was also compared to experimental data, showing moderately good relationships for δ ¹⁸O and δ ²H, but not for d-excess, nonetheless marking a substantial improvement from the previous release of the model.