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| Titel |
Climatic signals from 76 shallow firn cores in Dronning Maud Land, East Antarctica |
| VerfasserIn |
S. Altnau, E. Schlosser, E. Isaksson, D. Divine |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1994-0416
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| Digitales Dokument |
URL |
| Erschienen |
In: The Cryosphere ; 9, no. 3 ; Nr. 9, no. 3 (2015-05-07), S.925-944 |
| Datensatznummer |
250116793
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| Publikation (Nr.) |
 copernicus.org/tc-9-925-2015.pdf |
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| Zusammenfassung |
| The spatial and temporal distribution of surface mass balance (SMB)
and δ18O were investigated in the first comprehensive
study of a set of 76 firn cores retrieved by various expeditions
during the past 3 decades in Dronning Maud Land, East
Antarctica. The large number of cores was used to calculate stacked
records of SMB and δ18O, which considerably increased
the signal-to-noise ratio compared to earlier studies and
facilitated the detection of climatic signals. Considerable
differences between cores from the interior plateau and the coastal
cores were found. The δ18O of both the plateau and
the ice shelf cores exhibit a slight positive trend over the second
half of the 20th century. In the corresponding period, the SMB has
a negative trend in the ice shelf cores, but increases on the
plateau. Comparison with meteorological data from Neumayer Station
revealed that for the ice shelf regions, atmospheric dynamic effects
are more important than thermodynamics while on the plateau; the
temporal variations of SMB and δ18O occur mostly in
parallel, and thus can be explained by thermodynamic effects. The
Southern Annular Mode (SAM) has exhibited a positive trend since the
mid-1960s, which is assumed to lead to a cooling of East
Antarctica. This is not confirmed by the firn core data in our data
set. Changes in the atmospheric circulation that result in a changed
seasonal distribution of precipitation/accumulation could partly
explain the observed features in the ice shelf cores. |
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