Long-term variations of stratospheric circulations: a comparison of mean fields in the 1980s with CIRA-1986 models

Toshihiko Hirooka, J. Yamashita, K. Kawahira

Research output: Contribution to journalArticle

Abstract

On the basis of a careful comparison of routine satellite observations in the 1980s with the CIRA-1986 models as being representative of observations in the 1970s, long-term variations of stratospheric circulations are investigated. In most parts of the stratosphere, cooling occurs, independent of the month, while warming occurs in some places. In particular, warming in winter is conspicuous over the south polar region of the middle stratosphere. The non-uniform changes of temperature fields bring about changes of temperature gradients and zonal mean zonal winds : the westerly polar night jet becomes strong in the winter hemisphere while the easterly jet becomes weak in the summer hemisphere. In the southern hemisphere winter, wave activities become weak, corresponding to the strengthening of the polar night jet.

Original languageEnglish
Pages (from-to)1041-1049
Number of pages9
JournalJournal of Atmospheric and Terrestrial Physics
Volume56
Issue number9
DOIs
Publication statusPublished - Jan 1 1994
Externally publishedYes

Fingerprint

Upper atmosphere
winter
stratosphere
hemispheres
night
warming
heating
satellite observation
Southern Hemisphere
zonal wind
polar region
westerly
polar regions
Thermal gradients
temperature gradient
summer
temperature gradients
Temperature distribution
temperature distribution
Satellites

All Science Journal Classification (ASJC) codes

  • Environmental Science(all)
  • Geophysics
  • Atmospheric Science
  • Earth and Planetary Sciences(all)

Cite this

Long-term variations of stratospheric circulations : a comparison of mean fields in the 1980s with CIRA-1986 models. / Hirooka, Toshihiko; Yamashita, J.; Kawahira, K.

In: Journal of Atmospheric and Terrestrial Physics, Vol. 56, No. 9, 01.01.1994, p. 1041-1049.

Research output: Contribution to journalArticle

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