Scattering Phase Functions of Polar Mesospheric Clouds from the CIPS Instrument on the AIM Spacecraft

Details Scattering Phase Functions of Polar Mesospheric Clouds from the CIPS Instrument on the AIM Spacecraft Scattering Phase Functions of Polar Mesospheric Clouds from the CIPS Instrument on the AIM Spacecraft

May 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agusmsa31a..04b&link_type=abstract

American Geophysical Union, Spring Meeting 2008, abstract #SA31A-04

Physics

Optics

0300 Atmospheric Composition And Structure, 0319 Cloud Optics, 0320 Cloud Physics And Chemistry, 0340 Middle Atmosphere: Composition And Chemistry, 0394 Instruments And Techniques

Scientific paper

The Cloud Imaging and Particle Sizes (CIPS) instrument on the AIM spacecraft is a 4-camera nadir pointed imager with a band pass centered at 265 nm and a field of view of 120 x 80 degrees. CIPS observes Polar Mesospheric Clouds (PMCs) against the sunlit Rayleigh-scattered background. At individual polar locations approximately 5 km by 5 km in area, CIPS observes the same volume of air seven times over a range of scattering angles from 35 to 150 degrees. These multi-angle observations allow the identification and extraction of PMC scattered radiance from the Rayleigh-scattered background. Such observations can yield the PMC ice scattering phase function. PMC phase functions have been obtained throughout the polar cap for one full northern season and most of one southern season.. With assumptions about the shape of the ice particles, the phase function yields mean ice particle radii. We will overview the spatial and temporal variability of the CIPS observed PMC phase functions and compare those between the northern and southern hemispheres. We will discuss the implications for particle sizes.

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