Chandler Tides in the Atmosphere

Reid A. Bryson Center for Climatic Research, Institute for Environmental Studies, University of Wisconsin, Madison 53706

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Thomas B. Starr Center for Climatic Research, Institute for Environmental Studies, University of Wisconsin, Madison 53706

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Abstract

The Chandler Motion Of the earth's rotation axis should give rise to tides in the oceans and atmosphere. The Chandler tide in the ocean has been studied and found empirically to exceed the theoretical magnitude. The few Previous studies of the atmospheric Chandler tide have been based on a single frequency. Using new information about the multiple frequency structure of the Chandler motion we have 1) determined the Chandler frequencies more precisely, 2) extracted the topography of the tidal surface from the historical sea level pressure record for the Northern Hemisphere, 3) described several observed modes of tidal oscillation, and 4) shown that the Chandler tide in the atmosphere is of significant amplitude and thus a source of interannual monthly mean pressure pattern variance.

Abstract

The Chandler Motion Of the earth's rotation axis should give rise to tides in the oceans and atmosphere. The Chandler tide in the ocean has been studied and found empirically to exceed the theoretical magnitude. The few Previous studies of the atmospheric Chandler tide have been based on a single frequency. Using new information about the multiple frequency structure of the Chandler motion we have 1) determined the Chandler frequencies more precisely, 2) extracted the topography of the tidal surface from the historical sea level pressure record for the Northern Hemisphere, 3) described several observed modes of tidal oscillation, and 4) shown that the Chandler tide in the atmosphere is of significant amplitude and thus a source of interannual monthly mean pressure pattern variance.

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