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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.
© (2003) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Toshiki Iwasaki, Daisuke Tanaka, and Sakiko Shimizuguchi "Analysis of secondary circulation of the polar vortex", Proc. SPIE 4899, Atmospheric and Oceanic Processes, Dynamics, and Climate Change, (14 April 2003);

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