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Dependence of extinction cross-section on incident polarization state and particle orientation |
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| Authors: | Ping Yang Manfred Wendisch George Kattawar Yongxiang Hu |
| Institution: | a Department of Atmospheric Sciences, Texas A&M University, College Station, TX 77843, USA b Leipzig Institute for Meteorology, University of Leipzig, D-04103 Leipzig, Germany c Department of Physics & Astronomy, Texas A&M University, College Station, TX 77843, USA d NASA Goddard Institute for Space Studies, 2880 Broadway, New York, NY 10025, USA e Climate Science Branch, NASA Langley Research Center, Hampton, Virginia 2368, USA |
| Abstract: | This note reports on the effects of the polarization state of an incident quasi-monochromatic parallel beam of radiation and the orientation of a hexagonal ice particle with respect to the incident direction on the extinction process. When the incident beam is aligned with the six-fold rotational symmetry axis, the extinction is independent of the polarization state of the incident light. For other orientations, the extinction cross-section for linearly polarized light can be either larger or smaller than its counterpart for an unpolarized incident beam. Therefore, the attenuation of a quasi-monochromatic radiation beam by an ice cloud depends on the polarization state of the beam if ice crystals within the cloud are not randomly oriented. Furthermore, a case study of the extinction of light by a quartz particle is also presented to illustrate the dependence of the extinction cross-section on the polarization state of the incident light. |
| Keywords: | Extinction Polarization Ice crystal Orientation |
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