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Direct Observations of PMC Local Time Variations by Aura OMIThe 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 6S" and 8S' 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.
Document ID
20110023459
Acquisition Source
Goddard Space Flight Center
Document Type
Reprint (Version printed in journal)
Authors
DeLand, Matthew T.
(Science Systems and Applications, Inc. Lanham, MD, United States)
Shettle, Eric P.
(Naval Research Lab. Washington, DC, United States)
Thomas, Gary E.
(Colorado Univ. Boulder, CO, United States)
Olivero, John J.
(Embry-Riddle Aeronautical Univ. Daytona Beach, FL, United States)
Date Acquired
August 25, 2013
Publication Date
November 21, 2010
Publication Information
Publication: Journal of Atmospheric and Solar-Terrestrial Physics
Publisher: Elsevier Ltd.
Volume: 73
Issue: 14-15
ISSN: 1364-6826
Subject Category
Meteorology And Climatology
Report/Patent Number
GSFC.JA.5353.2011
Funding Number(s)
CONTRACT_GRANT: NNH08CD48C
Distribution Limits
Public
Copyright
Other

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