Diurnal Variations in Polar Mesospheric Clouds From SBUV Instruments

Details Diurnal Variations in Polar Mesospheric Clouds From SBUV Instruments Diurnal Variations in Polar Mesospheric Clouds From SBUV Instruments

May 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agusmsa53a..02d&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #SA53A-02

Physics

3360 Remote Sensing, 0320 Cloud Physics And Chemistry, 0340 Middle Atmosphere: Composition And Chemistry, 0394 Instruments And Techniques, 3305 Climate Change And Variability (1616, 1635, 3309, 4215, 4513)

Scientific paper

Ground-based measurements of polar mesospheric clouds (PMCs) by lidar instruments have demonstrated significant local time dependence in both occurrence frequency and brightness. Most satellite observations of PMCs are made from sun-synchronous orbits, so that measurements are taken at a specific local time at each latitude. At sufficiently high latitudes, both ascending node and descending node data are available for SBUV instruments, allowing us to evaluate diurnal variations as the ratio of two local times. Multiple SBUV/2 instruments have experienced substantial orbit drift during their lifetimes, providing a fairly extensive sampling of local times. We find a clear enhancement in both PMC occurrence frequency and albedo in SBUV data during late evening and early morning hours (approximately 21-24 and 0-3 hours local time), using zonally averaged data at 64-74° latitude. Occurrence frequency values are as much as 2-4 times higher at these times than for measurements made at 8-12 hours and 16-20 hours, which represent typical ascending node observation times for Northern Hemisphere and Southern Hemisphere data, respectively. Albedo values are increased by a factor of approximately 1.1-1.2 during the early morning hours. We will discuss the impact of these results on long-term PMC trends derived from SBUV data.

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