Hemispheric comparison of PMC altitudes

Details Hemispheric comparison of PMC altitudes Hemispheric comparison of PMC altitudes

Feb 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001georl..28..725c&link_type=abstract

Geophysical Research Letters, Volume 28, Issue 4, p. 725-728

Physics

13

Meteorology And Atmospheric Dynamics: Climatology, Meteorology And Atmospheric Dynamics: Mesospheric Dynamics, Meteorology And Atmospheric Dynamics: Polar Meteorology

Scientific paper

A middle ultraviolet imager observed the vertical structure of polar mesospheric clouds (PMCs) in the northern and southern polar regions during the austral summer of 1997-1998 and the arctic summer of 1999. During 23 transpolar passes, the imager obtained over 15,000 images at latitudes poleward of 55°. The accuracy and stability of the satellite platform and the large database permit the first statistical investigation of the small scale (~1 km) altitude structure of PMCs on a transpolar scale. During a satellite pass over either polar region, PMCs clustered at different altitudes between 80 and 85 km. Southern clouds had a mean altitude of 83.2+/-1.4km above the Earth ellipsoid, while northern clouds had a mean altitude of 82.6+/-1.3km, so southern and northern clouds had the same altitudes to within statistical variations. The mean PMC altitude was 82.7+/-1.3km for both hemispheres. In neither hemisphere did cloud altitudes exhibit systematic variation with latitude.

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