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Proceedings Paper

Analysis of secondary circulation of the polar vortex
Author(s): Toshiki Iwasaki; Daisuke Tanaka; Sakiko Shimizuguchi
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Paper Abstract

The secondary circulation of the southern hemispheric polar vortex diagnosed from objective analysis is compared wtih those estimated from minor constituent observation data by Halogen Occultation Experiment 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.

Paper Details

Date Published: 14 April 2003
PDF: 11 pages
Proc. SPIE 4899, Atmospheric and Oceanic Processes, Dynamics, and Climate Change, (14 April 2003); doi: 10.1117/12.466356
Show Author Affiliations
Toshiki Iwasaki, Tohoku Univ. (Japan)
Daisuke Tanaka, Tohoku Univ. (Japan)
Sakiko Shimizuguchi, Tohoku Univ. (Japan)

Published in SPIE Proceedings Vol. 4899:
Atmospheric and Oceanic Processes, Dynamics, and Climate Change
Zhaobo Sun; Fei-Fei Jin; Toshiki Iwasaki, Editor(s)

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