Wintertime stratospheric anomalies— Part II: Sudden warmings

Details Wintertime stratospheric anomalies— Part II: Sudden warmings Wintertime stratospheric anomalies— Part II: Sudden warmings

Sep 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992adats...9..311m&link_type=abstract

Advances in Atmospheric Sciences, Volume 9, Issue 3, pp.311-322

Physics

3

Scientific paper

The process of stratospheric sudden warmings from development of planetary waves to the sudden cooling after reversal of mean zonal circulation will be studied with the primitive equations of heat and momentum balances. It will be explained that the sudden warmings may occur only in the polar regions of winter stratosphere where zonal mean temperature decreases poleward. The heating rate in the order of major warmings is produced by developed planetary waves in the stratospheric breaking layers. The particular perturbation structure characterized by large amplitude of wave 1 together with minimum of wave 2 discovered by Labitzke (1977) is crucial for initiation of major warmings. The cooling by the same mechanism can be produced in the regions with reversed mean temperature gradient.

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