Seasonal variations and vertical movement of the tropopause in the UTLS region

K. Y. Wang, D. E. Shallcross, J. A. Pyle

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

Based on the tracking of the movement of the tropopause over the whole year, the extent/depth of stratosphere-troposphere exchange (STE) events and their seasonal variations is investigated. It is found that a stratospheric signature can be observed at pressures as high as 400 hPa in a hemisphere during its winter to spring period, while a tropospheric signature can be observed at pressures as low as 190 hPa during the hemispheric summer to autumn months. The major implication for such a pronounced vertical movement is that the downward penetration of air from the stratosphere is likely to deposit elevated levels of O3 into the upper troposphere. Though the analysis at 250 hPa reveals that the values of the stratosphere-troposphere index are similar all year round, a result which is consistent with other studies, it is found that an intrusion from the stratosphere to the troposphere is more likely to occur during the hemispheric winter to spring period than other seasons.

Original languageEnglish
Pages (from-to)871-874
Number of pages4
JournalAnnales Geophysicae
Volume20
Issue number6
StatePublished - 2002

Keywords

  • Atmospheric composition and structure
  • Density
  • Pressure
  • Temperature
  • Troposphere-composition and chemistry

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