Polar Mesospheric Clouds Particle Size retrieved from GOMOS / ENVISAT Observations

Details Polar Mesospheric Clouds Particle Size retrieved from GOMOS / ENVISAT Observations Polar Mesospheric Clouds Particle Size retrieved from GOMOS / ENVISAT Observations

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsa21a1765p&link_type=abstract

American Geophysical Union, Fall Meeting 2010, abstract #SA21A-1765

Physics

[0300] Atmospheric Composition And Structure

Scientific paper

Polar mesospheric clouds (PMC), also called noctilucent clouds, are the visible manisfestation of icy particles persistently present in the polar summer mesopause region. Their formation is a rather complicated physical process depending on atmospheric backgroud parameters, such as temperature and water vapor. These parameters are highly variable and hardly to measure directly at such altitudes. These clouds, located at the edge of space, have been recently studied with GOMOS on ENVISAT. GOMOS is a stellar occultation instrument combining 4 spectrometers in the spectral range 250 to 950 nm (UV - visible - near IR) and 2 fast photometers (470-520 nm and 650-700 nm). On the day side, in addition to starlight, GOMOS measures the sunlight scattered from the Earth’s limb. In the summer polar day, polar mesospheric clouds are clearly detected using the photometers signals. The sun-synchronous orbit of ENVISAT allows observing them in both hemispheres. The observation of these clouds with the spectrometers provides the spectral dependence of the scattering by PMC particles from which it is possible to derive particle radii. After a brief overview of GOMOS PMC data set, the retrieval method will be explained and results from several PMC seasons will be described, as well as their temporal and latitudinal variations. This work takes part in a working group, the Particle Size Working Group, which includes representatives from the different experiments observing PMC particles, and whose goal is to determine the state-of-the-art in mesospheric ice particle size.

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