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| Titel |
The impact of different glacial boundary conditions on atmospheric dynamics and precipitation in the North Atlantic region |
| VerfasserIn |
D. Hofer, C. C. Raible, A. Dehnert, J. Kuhlemann  |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1814-9324
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| Digitales Dokument |
URL |
| Erschienen |
In: Climate of the Past ; 8, no. 3 ; Nr. 8, no. 3 (2012-05-24), S.935-949 |
| Datensatznummer |
250005586
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| Publikation (Nr.) |
 copernicus.org/cp-8-935-2012.pdf |
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| Zusammenfassung |
Using a highly resolved atmospheric general circulation model, the impact of
different glacial boundary conditions on precipitation and atmospheric
dynamics in the North Atlantic region is investigated. Six 30-yr time slice
experiments of the Last Glacial Maximum at 21 thousand years before the present
(ka BP) and of a less pronounced glacial state – the Middle Weichselian
(65 ka BP) – are compared to analyse the sensitivity to changes in the ice
sheet distribution, in the radiative forcing and in the prescribed
time-varying sea surface temperature and sea ice, which are taken from a
lower-resolved, but fully coupled atmosphere-ocean general circulation model.
The strongest differences are found for simulations with different heights of
the Laurentide ice sheet. A high surface elevation of the Laurentide ice
sheet leads to a southward displacement of the jet stream and the storm track
in the North Atlantic region. These changes in the atmospheric dynamics
generate a band of increased precipitation in the mid-latitudes across the
Atlantic to southern Europe in winter, while the precipitation pattern in
summer is only marginally affected. The impact of the radiative forcing
differences between the two glacial periods and of the prescribed
time-varying sea surface temperatures and sea ice are of second order
importance compared to the one of the Laurentide ice sheet. They affect the
atmospheric dynamics and precipitation in a similar but less pronounced
manner compared with the topographic changes. |
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