Comparison of PMC Observations From SME, Nimbus-7 SBUV, and NOAA-9 SBUV/2

Details Comparison of PMC Observations From SME, Nimbus-7 SBUV, and NOAA-9 SBUV/2 Comparison of PMC Observations From SME, Nimbus-7 SBUV, and NOAA-9 SBUV/2

May 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..sa31b06d&link_type=abstract

American Geophysical Union, Spring Meeting 2001, abstract #SA31B-06

Physics

0340 Middle Atmosphere--Composition And Chemistry, 3360 Remote Sensing

Scientific paper

Satellite observations of polar mesospheric clouds (PMCs) are extremely useful, because they provide wide geographic coverage unavailable to a single ground-based observer. During 1985-1986, measurements of PMCs were made by the SME UVS instrument, the Nimbus-7 SBUV instrument, and the NOAA-9 SBUV/2 instrument. The limb viewing geometry of SME, where bright clouds were viewed against a dark background, was well-suited for PMC detection. Nadir-viewing SBUV-type measurements pose a greater challenge because of the brighter terrestrial background in the mid-UV and the competing effects of geophysical ozone variability. We use a revised version of the algorithm developed by Thomas et al. [1991] to extract PMC events from SBUV and SBUV/2 data. Inter-instrument comparisons of specific PMC observations are complicated by differences in instrument sensitivity, temporal differences between the spacecraft orbits, and spatial coincidence requirements. In this paper, we examine the seasonal and latitudinal variations of PMCs as observed by SME, Nimbus-7 SBUV, and NOAA-9 SBUV/2, and show that they give a consistent picture of PMC climatology. We will be extending this analysis to the full series of SBUV and SBUV/2 measurements covering the 22+ years from November 1978 to the present. This will allow us to examine PMC variations with a single type of satellite measurement covering 2 full solar cycles.

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