Spatial variability in isotope signatures of precipitation around Neumayer station, East Antarctica
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 com...
| Main Authors: | , , |
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| Format: | Conference Object |
| Language: | unknown |
| Published: |
2008
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| Subjects: | |
| Online Access: | https://epic.awi.de/id/eprint/19061/ https://epic.awi.de/id/eprint/19061/1/Fer2008a.pdf https://hdl.handle.net/10013/epic.30800 https://hdl.handle.net/10013/epic.30800.d001 |
| Summary: | 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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