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Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

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Record number 325812
Title Atmospheric variability over the 14,7 kyr BP stadial-interstadial transition in the North Atlantic region as simulated by an AGCM
Author(s) Renssen, H.; Bogaart, P.W.
Source Climate Dynamics 20 (2003)2-3. - ISSN 0930-7575 - p. 301 - 313.
DOI https://doi.org/10.1007/s00382-002-0271-7
Department(s) Hydrology and Quantitative Water Management
WIMEK
Publication type Refereed Article in a scientific journal
Publication year 2003
Keyword(s) general-circulation model - greenland ice-core - climate-change - younger dryas - last deglaciation - netherlands - temperature - europe - age - records
Abstract The ECHAM4-T42 atmospheric general circulation model was applied to study the change in atmospheric variability in the North Atlantic region over the similar to14.7 kyr cal BP climatic transition from Greenland Stadial 2a (GS-2a, end of Pleniglacial) to Greenland Interstadial le (GI-le, start Late Glacial). The following three climates are simulated: (1) present-day, (2) GS-2a and (3) GI-le. We focus on climatic parameters near the Earth's surface (temperature, precipitation and sea level pressure). Results on two different temporal scales are analysed: seasonal and daily. The seasonal fields show that the main change over the 14.7 kyr BP transition occurred in winter. We calculated daily standard deviations of temperature and pressure about the seasonal means and the high-pass filtered (less than six days) variability of pressure. The largest change in atmospheric variability occurred in northwest Europe. Here, the daily temperature variability decreased by 50%, whereas storm activity also decreased substantially. These changes are related to a northward shift of the Atlantic sea-ice margin at 14.7 kyr BP, leading to a northward relocation of the Atlantic storm track. In the GS-2a experiment, a strong storm track was located over northwest Europe, where frequent depressions produced alternations of northerly air flow (below -30 degreesC) and southerly air flow (close to 0 degreesC). This strong daily atmospheric variability decreased in GI-le because the storm track had a SW-NE orientation over the Atlantic towards Iceland. The decrease in atmospheric variability at 14.7 kyr BP probably contributed to landscape stabilization, for instance, through decreasing eolian transport.
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