Stratospheric Circulation of the Northern Hemisphere Winter during 1989-90

Toshihiko Hirooka, Kazuhiko Hayashi, Shinichi Yamada

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

The stratospheric circulation in winter 1989/90 is investigated with the aid of the transformed Eulerian mean (TEM) equations. The winter 1989/90 is characterized by a very cold mid-winter and a pronounced minor warming following it. The sudden warming was caused by the planetary wave of zonal wavenumber 1 vertically propagating from the troposphere. The temperature increase itself was fairly large but the westerly polar night jet did not reverse to the easterly at the lower stratosphere. This is consistent with the hypothesis shown by LABITZKE and VAN LOON (1988)t hat major mid-winter warmings are hard to occur in the easterly phase of the quasi-biennial oscillation (QBO) during weak solar activity.

Original languageEnglish
Pages (from-to)1097-1106
Number of pages10
JournalJournal of geomagnetism and geoelectricity
Volume44
Issue number11
DOIs
Publication statusPublished - Jan 1 1992

Fingerprint

Northern Hemisphere
winter
warming
heating
quasi-biennial oscillation
planetary wave
stratosphere
troposphere
solar activity
planetary waves
westerly
night
temperature

All Science Journal Classification (ASJC) codes

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

Cite this

Stratospheric Circulation of the Northern Hemisphere Winter during 1989-90. / Hirooka, Toshihiko; Hayashi, Kazuhiko; Yamada, Shinichi.

In: Journal of geomagnetism and geoelectricity, Vol. 44, No. 11, 01.01.1992, p. 1097-1106.

Research output: Contribution to journalArticle

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