Physics
Scientific paper
May 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..sa31b03a&link_type=abstract
American Geophysical Union, Spring Meeting 2001, abstract #SA31B-03
Physics
0399 General Or Miscellaneous
Scientific paper
Polar mesospheric clouds (PMCs) have been observed with both the Polar Ozone and Aerosol Measurement (POAM) II and III instruments. POAM II conducted measurements during the 93/94, 94/95 and 95/96 Southern Hemisphere PMC seasons, and results from the first two seasons have been previously reported in Debrestian et al., 1997. POAM III has been in operation since 1998 yielding PMC measurements for the 98/99, 99/00 and 00/01 Southern Hemisphere PMC seasons. The two POAM instruments are in identical orbits and are very similar in design and measurement-capability, although POAM III has increased sensitivity due to a better signal-to-noise ratio. These similarities allow for the creation of a consistent long-term PMC data record by combining the two POAM datasets. A common PMC detection algorithm, which takes into account the different instrument sensitivities, has been used to analyze this dataset to determine trends in the inter-annual variability of PMC frequency. POAM PMC probabilities decreased significantly from a maximum in the first two POAM II seasons to a minimum in the 99/00 season, and increased to near 93/94 values in the 00/01 season. The POAM PMC measurements have also been analyzed using a geometrical cloud model to determine inter-annual variability in cloud thickness, height and extinction. The multi-wavelength capability of the POAM III instrument has been used to study wavelength dependence of the measured slant optical depth. The results of this analysis are compared with Mie scattering theory to derive upper and lower limits of the modal PMC particle radii.
Alfred J. M.
Bevilacqua Richard M.
Lumpe J. D.
Shettle Eric P.
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