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Additional Evidence of an Upper Tropospheric Zonal/Eddy Relationship during Winter

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  • 1 Texas A&M University, Department of Meteorology, College Station, Texas
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Abstract

A zonal wind oscillation with a period of about 15–35 days is isolated over the middle latitudes of the Northern Hemisphere during winter. A systematic relationship between the zonal winds and wind departures from zonal symmetry (eddies) is found for nine prominent zonal wind oscillation cycles taken from six 120-day winters. This zonal/eddy relationship consists of an oscillation between anomalous zonal flow and anomalous meridional flow, which is strongest across North America from 150°W to 0°.

Abstract

A zonal wind oscillation with a period of about 15–35 days is isolated over the middle latitudes of the Northern Hemisphere during winter. A systematic relationship between the zonal winds and wind departures from zonal symmetry (eddies) is found for nine prominent zonal wind oscillation cycles taken from six 120-day winters. This zonal/eddy relationship consists of an oscillation between anomalous zonal flow and anomalous meridional flow, which is strongest across North America from 150°W to 0°.

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