The role of snow cover in the Northern Hemisphere winter to summer transition
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2006
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American Geophysical Union
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Abstract
This paper examines the role of North Hemisphere snow cover in the linkage between the winter North Atlantic Oscillation (NAO) and the summer Northern Annular Mode (NAM). This transition is partially supported by the persistence of the NAO-induced snow cover anomalies and the asymmetric thermal distribution induced by summer snow cover. We define an index of subpolar temperature difference which links winter NAO with the subsequent summer NAM. The index is also significant in the linkage between summer and winter climates and can be used as an useful predictor of the upcoming winter NAO.
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© 2006 by the American Geophysical Union. The authors would like to thank two anonymous reviewers for their valuable comments. The Spanish Science and Technology Department supported this study trough the VALIMOD (Climatic VALIdation of Conceptual MODels) project (REN2002-04558-C04-01).