Retrieval of PMC Scattering Phase Functions from Observations by the Cloud Imaging and Particle Size Experiment on the Aeronomy of Ice in the Mesosphere Explorer

Details Retrieval of PMC Scattering Phase Functions from Observations by the Cloud Imaging and Particle Size Experiment on the Aeronomy of Ice in the Mesosphere Explorer Retrieval of PMC Scattering Phase Functions from Observations by the Cloud Imaging and Particle Size Experiment on the Aeronomy of Ice in the Mesosphere Explorer

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufmsa14a..06b&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #SA14A-06

Physics

Optics

0319 Cloud Optics, 0340 Middle Atmosphere: Composition And Chemistry, 0360 Radiation: Transmission And Scattering, 0394 Instruments And Techniques, 3360 Remote Sensing

Scientific paper

The Cloud Imaging and Particle Size (CIPS) instrument on the AIM spacecraft is a 4-camera nadir pointed imager with a bandpass centered at 265 nm and a field of view of 120 by 80 degrees. CIPS observes Polar Mesospheric Clouds (PMCs) against the sunlit Rayleigh-scattered background. At individual polar locations approximately 5km by 5km in area, CIPS observes the same volume of air seven times over a range of scattering angles from about 35 to 150 degrees. These multi-angle observations allow the identification and extraction of the PMC scattered radiance from the Rayleigh-scattered background. The former has a highly asymmetric phase function about 90 degrees scattering angle, while the latter has a phase function that is symmetric about 90 degrees scattering angle. The retrieved PMC phase function can then be interpreted to obtain PMC particle size distributions as well as the PMC absolute albedo. We describe the technique for identification of PMC in the CIPS observations, the separation of the Rayleigh and PMC radiances, and the PMC phase function results from the first season of CIPS observations.

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