Stratospheric tropical warming event and its impact on the polar and tropical troposphere

Kunihiko Kodera, Nawo Eguchi, Hitoshi Mukougawa, Tomoe Nasuno, Toshihiko Hirooka

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Stratosphere-troposphere coupling is investigated in relation to middle atmospheric subtropical jet (MASTJ) variations in boreal winter. An exceptional strengthening of the MASTJ occurred in association with a sudden equatorward shift of the stratospheric polar night jet (PNJ) in early December 2011. This abrupt transformation of the MASTJ and PNJ had no apparent relation to the upward propagation of planetary waves from the troposphere. The impact of this stratospheric event penetrated into the troposphere in two regions: in the northern polar region and the tropics. Due to the strong MASTJ, planetary waves at higher latitudes were deflected and trapped in the northern polar region. Trapping of the planetary waves resulted in amplification of zonal wave number 1 component, which appeared in the troposphere as the development of a trough over the Atlantic sector and a ridge over the Eurasian sector. A strong MASTJ also suppressed the equatorward propagation of planetary waves, which resulted in weaker tropical stratospheric upwelling and produced anomalous warming in the tropical stratosphere. In the tropical tropopause layer (TTL), however, sublimation of ice clouds kept the temperature change minor. In the troposphere, an abrupt termination of a Madden-Julian Oscillation (MJO) event occurred following the static stability increase in the TTL. This termination suggests that the stratospheric event affected the convective episode in the troposphere.

Original languageEnglish
Pages (from-to)615-625
Number of pages11
JournalAtmospheric Chemistry and Physics
Volume17
Issue number1
DOIs
Publication statusPublished - Jan 12 2017

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troposphere
warming
planetary wave
tropopause
polar region
stratosphere
Madden-Julian oscillation
sublimation
trapping
amplification
upwelling
trough
ice
winter
temperature

All Science Journal Classification (ASJC) codes

  • Atmospheric Science

Cite this

Stratospheric tropical warming event and its impact on the polar and tropical troposphere. / Kodera, Kunihiko; Eguchi, Nawo; Mukougawa, Hitoshi; Nasuno, Tomoe; Hirooka, Toshihiko.

In: Atmospheric Chemistry and Physics, Vol. 17, No. 1, 12.01.2017, p. 615-625.

Research output: Contribution to journalArticle

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