Analysis of secondary circulation of the polar vortex

Toshiki Iwasaki, Daisuke Tanaka, Sakiko Shimizuguchi

Research output: Contribution to journalConference articlepeer-review

Abstract

The secondary circulation of the southern hemispheric polar vortex diagnosed from objective analysis is compared with those estimated from minor constituent observation data by Halogen Occultation Experiment (HALOE) and by Improved Limb Atmospheric Spectrometer (ILAS). The secondary circulation driven by wave-mean-flow interactions plays an important role in the formation and maintenance of polar vortex. We are developing a diagnostic tool of the Lagrangian-mean circulation and wave-mean-flow interactions for the zonal mean states based on the pressure-isentrope hybrid vertical coordinate. Using this tool, we depict the secondary circulation from NCEP/NCAR reanalysis. The zonal mean vertical velocity is downward in the inner region of the polar vortex, while it is almost zero near the edge of the polar vortex. This is qualitatively consistent with the vertical displacement of material surface estimated from the ILAS data of minor constituents. In the mature stage, to our diagnosis, the outer region of polar vortex becomes a major downward branch of the Brewer-Dobson circulation. This must be validated with satellite observation in the future.

Original languageEnglish
Pages (from-to)45-55
Number of pages11
JournalProceedings of SPIE - The International Society for Optical Engineering
Volume4899
DOIs
Publication statusPublished - 2002 Dec 1
EventAtmospheric and Oceanic Processes, Dynamics, and Climate Change - Hangzhou, China
Duration: 2002 Oct 252002 Oct 27

Keywords

  • ILAS
  • Lagragian-mean circulation
  • Polar vortex

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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