Synoptic reorganization of atmospheric flow during the Last Glacial Maximum.

Justino, Flavio B., Timmermann, Axel, Merkel, Ute and Sousa, E. P. (2005) Synoptic reorganization of atmospheric flow during the Last Glacial Maximum. Open Access Journal of Climate, 18 . pp. 2826-2846. DOI 10.1175/JCLI3403.1.

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A coupled global atmosphere–ocean model of intermediate complexity is used to study the influence of glacial boundary conditions on the atmospheric circulation during the Last Glacial Maximum in a systematical manner. A web of atmospheric interactions is disentangled, which involves changes in the meridional temperature gradient and an associated modulation of the atmospheric baroclinicity. This in turn drives anomalous transient eddy momentum fluxes that feed back onto the zonal mean circulation. Moreover, the modified transient activity (weakened in the North Pacific and strengthened in the North Atlantic) leads to a meridional reorganization of the atmospheric heat transport, thereby feeding back onto the meridional temperature structure. Furthermore, positive barotropic conversion and baroclinic production rates over the Laurentide ice sheets and the far eastern North Pacific have the tendency to decelerate the westerlies, thereby feeding back to the stationary wave changes triggered by orographic forcing.

Document Type: Article
Keywords: Paleo climate modelling, Last Glacial Maximum, atmospheric circulation
Research affiliation: OceanRep > Leibniz-Institut für Meereswissenschaften
OceanRep > GEOMAR > FB1 Ocean Circulation and Climate Dynamics > FB1-ME Maritime Meteorology
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1175/JCLI3403.1
ISSN: 0894-8755
Projects: SFB460
Date Deposited: 03 Dec 2008 16:51
Last Modified: 23 Sep 2019 17:50

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