Variations of Polar Mesospheric Clouds From 16 Years of SAGE II Observations

Details Variations of Polar Mesospheric Clouds From 16 Years of SAGE II Observations Variations of Polar Mesospheric Clouds From 16 Years of SAGE II Observations

May 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..sa31b04s&link_type=abstract

American Geophysical Union, Spring Meeting 2001, abstract #SA31B-04

Other

0300 Atmospheric Composition And Structure, 0340 Middle Atmosphere--Composition And Chemistry, 0360 Transmission And Scattering Of Radiation, 3360 Remote Sensing

Scientific paper

The Version 6.0 data from the SAGE II included for the first time, transmission profiles that were processed to altitudes above 90 km of sufficient quality to detect polar Mesospheric Clouds (PMCs). This data covers a nearly 16-year period starting in 1984. The binned transmission data was corrected for residual Rayleigh scattering by fitting the 386 nm transmissions with a parameterized Rayleigh profile outside the altitude range the PMC is expected to effect the atmosphere transmission. PMCs are normally observed at latitudes poleward of 50 deg., at altitudes of 80 to 85 km, during a 3-month period starting about a month before summer solstice in both hemispheres. The SAGE II measurements only reach sufficiently high latitudes for a few periods of one to two weeks each during the PMC season. The timing and exact latitude coverage vary slightly from one year to the next. Because of the strong dependence of the expected PMC frequency of occurrence on latitude & date, for trend studies it is necessary to correct the SAGE II PMC observation for these year-to-year changes in coverage. This is done by normalizing the SAGE data to the expected frequency of occurrence as a function of date and latitude based on the SME climatology, [1981-1986]. We will present comparisons with other satellite observations such as POAM, and discuss the variations in the PMC frequency and optical thickness over the 16-year period.

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