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GEOPHYSICAL RESEARCH LETTERS, VOL. 30, NO. 6, 1302, doi:10.1029/2002GL016341, 2003

The potential role of snow cover in forcing interannual variability of the major Northern Hemisphere mode

Kazuyuki Saito

Frontier Research System for Global Change, Yokohama, Japan


Judah Cohen

Atmospheric and Environmental Research, Inc., Lexington, Massachusetts, USA


Abstract

Decadal trends have been noted in the leading mode of boreal winter variability. Given that this mode is thought to be an internal mode of the atmosphere it remains unclear as to what is responsible for interannual to interdecadal oscillations of this mode. We demonstrate that continental-scale snow cover varies at the same multi-year time periods as the atmosphere but leads the atmosphere by several months through their mutual oscillations. Therefore we propose snow cover as a potential contributor to the interannual variability of the leading boreal winter mode of the atmosphere.

Published 22 March 2003.

Index Terms: 3322 Meteorology and Atmospheric Dynamics: Land/atmosphere interactions; 3319 Meteorology and Atmospheric Dynamics: General circulation; 1863 Hydrology: Snow and ice (1827); 1899 Hydrology: General or miscellaneous.

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Citation: Saito, K., and J. Cohen (2003), The potential role of snow cover in forcing interannual variability of the major Northern Hemisphere mode, Geophys. Res. Lett., 30(6), 1302, doi:10.1029/2002GL016341.