Ice content of Polar Mesospheric Clouds measured by the Cloud Imaging and Particle Size (CIPS) and the Solar Occultation for Ice (SOFIE) experiments on the Aeronomy of Ice in the Mesosphere (AIM) Mission

Details Ice content of Polar Mesospheric Clouds measured by the Cloud Imaging and Particle Size (CIPS) and the Solar Occultation for Ice (SOFIE) experiments on the Aeronomy of Ice in the Mesosphere (AIM) Mission Ice content of Polar Mesospheric Clouds measured by the Cloud Imaging and Particle Size (CIPS) and the Solar Occultation for Ice (SOFIE) experiments on the Aeronomy of Ice in the Mesosphere (AIM) Mission

May 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agusmsa31a..05t&link_type=abstract

American Geophysical Union, Spring Meeting 2008, abstract #SA31A-05

Physics

0300 Atmospheric Composition And Structure, 0340 Middle Atmosphere: Composition And Chemistry, 0394 Instruments And Techniques, 3332 Mesospheric Dynamics

Scientific paper

Two experiments on the AIM spacecraft, launched in April, 2007, were designed to take complementary measurements of Polar Mesospheric Clouds (PMC) properties. The Cloud Imaging and Particle Size (CIPS) experiment measures PMC at several scattering angles with 5 km spatial resolution. The Solar Occultation for Ice Experiment (SOFIE) measures the solar extinction by PMC at the limb at 11 wavelengths. Near-simultaneous imaging by CIPS occurs in the same volume measured by SOFIE. The angular dependence of the scattered radiance at 265 nm is measured every 5 km along the line-of-sight measured by SOFIE, in the so-called common volume, defined by a rectangular area about 5 x 290 km horizontally. The combination of measurements (scattering phase function in the UV, and extinction at multiple wavelengths from the UV to the IR) constitutes the most complete set of optical measurements ever taken of PMC. The column-integrated ice water content (IWC) of the clouds is a fundamental property, which can be directly compared with models. We will show how the individual contributions to the IWC along the slant path through the clouds sum up to yield the column-integrated ice mass, a quantity which is measured accurately by SOFIE to within 10 percent. Since CIPS measures scattering phase functions over nearly the entire polar cap region, this analysis will be a key validation for extending the technique to derive IWC distributions over the summertime high latitude region.

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