Seasonal Variation of PMC Particle Size from SNOE UV Measurements for the Northern 2000 and Southern 2000/2001 Seasons

Details Seasonal Variation of PMC Particle Size from SNOE UV Measurements for the Northern 2000 and Southern 2000/2001 Seasons Seasonal Variation of PMC Particle Size from SNOE UV Measurements for the Northern 2000 and Southern 2000/2001 Seasons

May 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agusmsa51a..03r&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #SA51A-03

Physics

0300 Atmospheric Composition And Structure, 0305 Aerosols And Particles (0345, 4801, 4906), 0340 Middle Atmosphere: Composition And Chemistry

Scientific paper

The Ultraviolet Spectrometer (UVS) on the Student Nitric Oxide Explorer (SNOE) measured scattered limb radiance at small (~ 35 degrees) and large (~ 140 degrees) scattering angles from Polar Mesospheric Clouds for the northern hemisphere (NH) of 2000 and the southern hemisphere (SH) for the 2000/2001 season. From this data base, we deduce the average particle size from the measured scattering angle asymmetry. This quantity is determined as a function of time within the PMC season, and latitude, assuming Mie scattering and a Gaussian particle size distribution with a 14 nm width. The results show that for high latitudes in the NH, the mean particle size (in units of equivalent sphere radius) grows systematically from the seasonal onset, from about 25 nm to a maximum of about 40 nm at 30 days after solstice. Lower latitudes show a similar time dependence but with smaller particle sizes. SH PMC particle sizes display a more complicated seasonal variability, correlating with variability in cloud height and brightness throughout the season. Particle sizes in the SH are generally smaller than those in the NH, consistent with the northern bias in PMC brightness. These results are interpreted in terms of our understanding of PMC microphysics and inter-hemispheric differences in temperature and dynamics.

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