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Two contrasting Northern Hemisphere winters: 1980 - 1981 and 1981 - 1982Seasonal statistics calculated from daily operational analyses by the European Centre for Medium Range Weather Forecasts for December 1980 - February 1981 (season 1) and December 1981 - February 1982 (season 2) were used to contrast the two seasonal mean circulation patterns present in the Northern Hemisphere and to investigate possible causes for the differences. The vertically averaged seasonal mean zonal wind and E-vector, a measure of the anisotropy of the transient eddies over the Pacific is shown for season 1 and season 2. The pattern in season 2, but not season 1, resembles that found in a modeling study of barotropic instability. One possible explanation for the differences between season 1 and 2 is a weak change in tropical heating associated with the southern oscillation, the effect of which in midlatitude was amplified by the occurrence of barotropic instability over the Pacific in season 2, but not season 1.
Document ID
19840014019
Acquisition Source
Legacy CDMS
Document Type
Other
Authors
White, G. H.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Date Acquired
August 11, 2013
Publication Date
January 1, 1984
Publication Information
Publication: Res. Rev., 1983
Subject Category
Meteorology And Climatology
Accession Number
84N22087
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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