Stratospheric warmings during February and March 1993 | Zendy

Manney G. L. | Zendy; Zurek R. W. | Zendy; O'Neill A. | Zendy; Swinbank R. | Zendy; Kumer J. B. | Zendy; Mergenthaler J. L. | Zendy; Roche A. E. | Zendy

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Stratospheric warmings during February and March 1993

Author(s) -

Manney G. L.,

Zurek R. W.,

O'Neill A.,

Swinbank R.,

Kumer J. B.,

Mergenthaler J. L.,

Roche A. E.

Publication year - 1994

Publication title -

geophysical research letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.007

H-Index - 273

eISSN - 1944-8007

pISSN - 0094-8276

DOI - 10.1029/94gl00093

Subject(s) - diabatic , polar vortex , anticyclone , vortex , baroclinity , polar , atmospheric sciences , descent (aeronautics) , zonal and meridional , climatology , latitude , geology , troposphere , physics , meteorology , geodesy , astronomy , adiabatic process , thermodynamics

Two stratospheric warmings during February and March 1993 are described using UKMO analyses, calculated PV and diabatic heating, and N 2 O observed by the CLAES instrument on the UARS. The first warming affected temperatures over a larger region, while the second produced a larger region of reversed zonal winds. Tilted baroclinic zones formed in the temperature field, and the polar vortex tilted westward with height. Narrow tongues of high PV and low N 2 O were drawn off the polar vortex, and irreversibly mixed. Tongues of material were drawn from low latitudes into the region between the polar vortex and the anticyclone; diabatic descent was also strongest in this region. Increased N 2 O over a broad region near the edge of the polar vortex indicates the importance of horizontal transport. N 2 O decreased in the vortex, consistent with enhanced diabatic descent during the warmings.

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