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| Titel |
Evolution of the large-scale atmospheric circulation in response to changing ice sheets over the last glacial cycle |
| VerfasserIn |
M. Löfverström, R. Caballero, J. Nilsson, J. Kleman |
| 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 ; 10, no. 4 ; Nr. 10, no. 4 (2014-07-31), S.1453-1471 |
| Datensatznummer |
250117022
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| Publikation (Nr.) |
 copernicus.org/cp-10-1453-2014.pdf |
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| Zusammenfassung |
| We present modelling results of the atmospheric circulation at the
cold periods of marine isotope stage 5b (MIS 5b), MIS 4 and the Last
Glacial Maximum (LGM), as well as the interglacial. The
palaeosimulations are forced by ice-sheet reconstructions consistent
with geological evidence and by appropriate insolation and
greenhouse gas concentrations. The results suggest that the
large-scale atmospheric winter circulation remained largely similar
to the interglacial for a significant part of the glacial cycle. The
proposed explanation is that the ice sheets were located in areas
where their interaction with the mean flow is limited. However, the
LGM Laurentide Ice Sheet induces a much larger planetary wave that
leads to a zonalisation of the Atlantic jet. In summer, the ice-sheet topography dynamically induces warm temperatures in Alaska and
central Asia that inhibits the expansion of the ice sheets into
these regions. The warm temperatures may also serve as an
explanation for westward propagation of the Eurasian Ice Sheet from
MIS 4 to the LGM. |
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