Physics
Scientific paper
Apr 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983ssrv...34..387m&link_type=abstract
Space Science Reviews, Volume 34, Issue 4, pp.387-396
Physics
4
Scientific paper
A few topics concerning the dynamics of the circulation and waves in the middle atmosphere are reviewed. The Lagrangian-mean descriptions of waves and wave-mean flow interactions developed in recent years give us new views on the general circulation of the lower stratosphere and the mechanism of a sudden warming. In the former problem, the classical Brewer-Dobson circulation model is revived as the Langrangian-mean circulation which is directly connected with transports of long-lived trace species. In the latter problem, the easterly acceleration by planetary waves is understood in terms of the form drag through undulating material surfaces. This effect is nearly identical with the Eliassen-Palm flux, which is now used as a powerful tool to diagnose detailed mechanism of sudden warmings on individual event basis. Preliminary result of the author's numerical experiment to model sudden warmings caused by a variable planetary wave forcing in the troposphere is presented.
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