Interhemispheric differences in the properties of Polar Mesospheric Clouds measured by Odin/OSIRIS

Details Interhemispheric differences in the properties of Polar Mesospheric Clouds measured by Odin/OSIRIS Interhemispheric differences in the properties of Polar Mesospheric Clouds measured by Odin/OSIRIS

May 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agusmsa33a..07p&link_type=abstract

American Geophysical Union, Spring Meeting 2008, abstract #SA33A-07

Physics

Optics

0305 Aerosols And Particles (0345, 4801, 4906), 0319 Cloud Optics, 0340 Middle Atmosphere: Composition And Chemistry

Scientific paper

The Optical Spectrograph and InfraRed Imager System instrument (OSIRIS) observes Polar Mesospheric Clouds (PMCs) in both hemispheres since November, 2001. The OSIRIS PMC dataset contains cloud's geographic location, altitude, time of detection, and calibrated radiance at peak. Spectral measurements in the UV region, 290-305 nm, also allow the retrieval of particle sizes for bright clouds. As the high-latitude measurements are performed at similar solar scattering angles in each hemisphere, an interhemispheric comparison of PMC properties retrieved from the OSIRIS measurements is a relatively simple process. A detailed analysis of interseasonal, interhemispheric, and interannual variability in the OSIRIS PMC occurrence frequency, altitudes, brightness, and particle sizes is presented in this work. High sensitivity of the limb-scattering technique employed by OSIRIS and good signal-to-noise ratio at PMC altitudes also permits the detection of faint clouds and thus gives OSIRIS a unique opportunity to observe PMCs at low latitudes. We will also discuss a possible recent increase in the number of PMC detections equatorward of 50 degrees in both hemispheres.

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