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Advances in Meteorology
Volume 2015, Article ID 629429, 19 pages
http://dx.doi.org/10.1155/2015/629429
Research Article

Atmospheric Circulation Regimes in a Nonlinear Quasi-Geostrophic Model

1Alfred Wegener Institute, Helmholtz Center for Polar and Marine Research, Research Unit Potsdam, Telegrafenberg A43, 14473 Potsdam, Germany
2Obukhov Institute of Atmospheric Physics, Russian Academy of Sciences, Pyzhevsky 3, Moscow 1190117, Russia

Received 10 March 2015; Revised 19 May 2015; Accepted 24 May 2015

Academic Editor: Anthony R. Lupo

Copyright © 2015 Henriette Labsch et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Atmospheric low-frequency variability and circulation regime behavior are investigated in the context of a quasi-geostrophic (QG) three-level T63 model of the wintertime atmospheric circulation over the Northern Hemisphere (NH). The model generates strong interannual and decadal variability, with the domination of the annular mode of variability. It successfully reproduces a satisfactory model climatology and the most important atmospheric circulation regimes. The positive phase of the Arctic Oscillation is a robust feature of the quasi-geostrophic T63 model. The model results based on QG dynamics underlie atmospheric regime behavior in the extratropical NH and suggest that nonlinear internal processes deliver significant contribution to the atmospheric climate variability on interannual and decadal timescales.