Physics
Scientific paper
Jun 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000jastp..62..713d&link_type=abstract
Journal of Atmospheric and Solar-Terrestrial Physics, Volume 62, Issue 9, p. 713-723.
Physics
1
Scientific paper
Scattering ratios of stratospheric aerosol obtained by lidar at McMurdo Station, Antarctica (78°S, 167°E), during February-December 1993, have been analysed in relation to the stratospheric polar vortex. Seasonal changes in their properties are used to infer dynamic processes occurring in the Antarctic stratosphere during the year. Descent rates are calculated and compared to values obtained with different studies. Our analysis suggests that the apparent springtime cleansing of the Antarctic stratosphere is the result of subsidence of air masses inside the vortex and of sedimentation of larger particles. Below 20 km of height, an enhancement of the aerosol descent rates during July was associated with high occurrence of Polar Stratospheric Cloud events above McMurdo Station in that period. A synoptic approach using potential vorticity values at 425 K above the station has been employed to figure out the behaviour of the aerosol across the vortex boundary during its early formation.
Adriani Alberto
Cairo Francesco
Di Donfrancesco1 G.
Gobbi Gian Paolo
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