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The importance of non-quasigeostrophic forcing during the development of a blocking anticycloneThis study examines the impact of non-quasigeostrophic (NQG) processes during the development of a blocking anticyclone (January 21, 1979 over the southern tip of Greenland) and a precursor, upstream intense cyclone (January 18, 1979). Energy quantities and height tendencies determined from quasigeostrophic estimates are compared with the same quantities obtained from more general formulations. GLA FGGE Level III-b analysis on a 4 deg lat by 5 deg long grid was used to obtain energetics results. It is concluded that NQG processes strengthened the intensity of the block and a precursor explosive cyclone and that a portion of this increase resulted from enhanced baroclinic conversion of eddy potential to eddy kinetic energy and reduced barotropic energy conversion from eddy to zonal flow. It is suggested that NQG vorticity advection, instead of moderating wave developments, enhanced the block development, and it is also suggested that QG forcing might not have been adequate to produce the observed block development.
Document ID
19910026408
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Tsou, Chih-Hua
(Purdue Univ. West Lafayette, IN, United States)
Smith, Phillip J.
(Purdue University West Lafayette, IN, United States)
Date Acquired
August 14, 2013
Publication Date
May 1, 1990
Publication Information
Publication: Tellus, Series A - Dynamic Meteorology and Oceanography
Volume: 42A
ISSN: 0280-6495
Subject Category
Meteorology And Climatology
Accession Number
91A11031
Funding Number(s)
CONTRACT_GRANT: NAG8-764
CONTRACT_GRANT: NAS8-34009
Distribution Limits
Public
Copyright
Other

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