Direct observations of PMC local time variations by Aura OMI

Details Direct observations of PMC local time variations by Aura OMI Direct observations of PMC local time variations by Aura OMI

Sep 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011jastp..73.2049d&link_type=abstract

Journal of Atmospheric and Solar-Terrestrial Physics, Volume 73, Issue 14-15, p. 2049-2064.

Physics

Scientific paper

The Ozone Monitoring Instrument (OMI) on the Aura satellite obtains unique measurements for polar mesospheric cloud (PMC) analysis. Its wide cross-track viewing swath and high along-track spatial resolution makes it possible to directly evaluate PMC occurrence frequency and brightness variations between 65° and 85° latitude as a function of local time over a 12-14 h continuous period. OMI PMC local time variations are closely coupled to concurrent variations in measurement scattering angle, so that ice phase function effects must be considered when interpreting the observations. Two different phase functions corresponding to bright and faint clouds are examined in this analysis. OMI observations show maximum frequency and albedo values at 8-10 h local time in the Northern Hemisphere, with decreasing amplitude at higher latitudes. Southern Hemisphere values reach a minimum at 18-20 h LT. Larger variations are seen in Northern Hemisphere data. No statistically significant longitudinal dependence was seen.

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