Phase functions of polar mesospheric cloud ice as observed by the CIPS instrument on the AIM satellite |
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| Authors: | Scott M Bailey Gary E Thomas David W Rusch Aimee W Merkel Christian D Jeppesen Justin N Carstens Cora E Randall William E McClintock James M Russell |
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| Institution: | 1. Bradley Department of Electrical and Computer Engineering, Virginia Tech, Blacksburg, VA 24061, USA;2. Laboratory for Atmospheric and Space Physics, University of Colorado, Boulder, CO 80303, USA;3. Center for Atmospheric Sciences, Hampton University, Hampton, VA 23668, USA;1. University of Alaska, Fairbanks, USA;2. Virginia Polytechnic Institute and State University, Blacksburg, USA;3. University of Rostock, Kuehlungsborn, Germany;4. University of Rostock, Kuehlungsborn, Germany;5. University of Colorado, Boulder, USA;1. Institute of Physics, Ernst-Moritz-Arndt-University of Greifswald, Felix-Hausdorff-Str. 6, 17489 Greifswald, Germany;2. GATS Inc., Driggs, ID83422, USA;3. Formerly Institute of Physics, Ernst-Moritz-Arndt-University of Greifswald, Germany;1. Bradley Department of Electrical and Computer Engineering, Virginia Tech, Blacksburg, VA 24061, USA;2. Computational Physics Inc., Boulder, CO 80301, USA;3. Laboratory for Atmospheric and Space Physics and Department of Atmospheric and Oceanic Sciences, University of Colorado, Boulder, CO 80303, USA;1. Center for Space Sciences and Engineering and Department of Electrical and Computer Engineering, Virginia Tech, Blacksburg, VA, 24061, United States;2. Laboratory for Atmospheric and Space Physics, University of Colorado, Boulder, CO 80303, United States;3. GATS Inc., Newport News, VA 23606, United States;4. Computational Physics Inc., Boulder, CO 80301, United States;5. Center for Atmospheric Sciences, Hampton University, Hampton, VA 23668, United States;1. Space Science Division, Naval Research Laboratory, Washington, DC 20375, USA;2. Institute of Meteorology and Climate Research, Karlsruhe Institute of Technology, Leopoldshafen, Germany;3. School of Physics, Astronomy and Computational Sciences, George Mason University, Fairfax, VA, USA;4. Laboratory of Atmospheric and Space Physics and Department of Atmospheric and Oceanic Sciences, University of Colorado, Boulder, CO, USA;5. Center for Atmospheric Sciences, Hampton University, Hampton, VA, USA;6. Department of Earth and Space Sciences, Chalmers University of Technology, Göteborg, Sweden |
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| Abstract: | The Cloud Imaging and Particle Size (CIPS) instrument on the Aeronomy of the Ice in the Mesosphere (AIM) spacecraft is a 4-camera nadir pointed imager with a bandpass centered at 265 nm and a field of view of 120°×80°. CIPS observes polar mesospheric clouds (PMCs) against the sunlit Rayleigh-scattered background. At individual polar locations approximately 5 km×5 km in area, CIPS observes the same volume of air seven times over a range of scattering angles from about 35° to 150°. These multi-angle observations allow the identification and extraction of the PMC scattered radiance from the Rayleigh-scattered background. We utilize the fact that the former has a highly asymmetric phase function about 90° scattering angle, while the latter has a phase function that is symmetric. The retrieved PMC phase function can then be interpreted to obtain PMC particle size distributions. We describe a technique for identification of PMCs in the CIPS observations through the separation of the Rayleigh and PMC radiances. PMC phase function results are shown for the first season of CIPS observations. Assuming the particles are oblate spheroids with an axial ratio of 2, and a Gaussian distribution of width 14 nm, we find the phase functions are consistent with mean radii between 50 and 60 nm. These results are similar to those discussed by Hervig et al. 2009. Interpretation of SOFIE PMC measurements: cloud identification and derivation of mass density, particle shape, and particle size. J. Atmos. Sol. Terr. Phys., in review.] in this issue from the Solar Occultation for Ice Experiment (SOFIE) which also flies on the AIM satellite. |
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