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Spatial variability in isotope signatures of precipitation around Neumayer station, East Antarctica

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Fernandoy, F. , Oerter, H. and Meyer, H. (2008): Spatial variability in isotope signatures of precipitation around Neumayer station, East Antarctica , SCAR IASC IPY Open Science Conference, St Petersburg, Russia. 9-11 July 2008. .
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Abstract:

At the German Antarctic Neumayer Station located on Antarctic coast (70°39S, 8°15W), fresh snow was sampled during the last 26 years. Additionally, during the PreIPICS campaign 2006-2007 (Ekstroemisen ice shelf), four ice-cores were retrieved on the ridges Halvfarryggen and Soerasen. The isotope composition d18O and dD of snow and ice-cores were analysed to reconstruct climate variability of the past 50 years. The mean d18O for fresh snow samples is -20.5, reflecting regional cold condensation temperatures (-16°C MAAT at Neumayer, 1982-2006). Two ice cores located at 70 and 100 km to the south-west of the station as well as 690 and 655 m a.s.l. respectively, have similar mean d18O values compared to Neumayer, showing no significant altitude effect. The other two cores are situated further inland (539 and 760 m a.s.l.), show more negative mean values (-24.3 and -22.8) as consequence of the altitude effect. Based on these observations, it is likely that altitude effects in this region start taking place at heights above 690 m a.s.l. The deuterium excess (d = dD 8 d18O) indicates that mountain ranges get different moisture influence in east (Halvfarryggen) and west (Soerasen). No significant temperature trend is derived from d18O values at this area.

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