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| Titel |
The key role of topography in altering North Atlantic atmospheric circulation during the last glacial period |
| VerfasserIn |
F. S. R. Pausata, C. Li, J. J. Wettstein, M. Kageyama, K. H. Nisancioglu |
| 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 ; 7, no. 4 ; Nr. 7, no. 4 (2011-10-18), S.1089-1101 |
| Datensatznummer |
250004676
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| Publikation (Nr.) |
 copernicus.org/cp-7-1089-2011.pdf |
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| Zusammenfassung |
| The Last Glacial Maximum (LGM; 21 000 yr before present) was a period of
low atmospheric greenhouse gas concentrations, when vast ice sheets covered
large parts of North America and Europe. Paleoclimate reconstructions and
modeling studies suggest that the atmospheric circulation was substantially
altered compared to today, both in terms of its mean state and its
variability. Here we present a suite of coupled model simulations designed to
investigate both the separate and combined influences of the main LGM
boundary condition changes (greenhouse gases, ice sheet topography and ice
sheet albedo) on the mean state and variability of the atmospheric
circulation as represented by sea level pressure (SLP) and 200-hPa zonal wind
in the North Atlantic sector. We find that ice sheet topography accounts for
most of the simulated changes during the LGM. Greenhouse gases and ice sheet
albedo affect the SLP gradient in the North Atlantic, but the overall
placement of high and low pressure centers is controlled by topography.
Additional analysis shows that North Atlantic sea surface temperatures and
sea ice edge position do not substantially influence the pattern of the
climatological-mean SLP field, SLP variability or the position of the North
Atlantic jet in the LGM. |
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