Use of polarization for cloud study

Details Use of polarization for cloud study Use of polarization for cloud study

Oct 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997spie.3121..330g&link_type=abstract

Proc. SPIE Vol. 3121, p. 330-341, Polarization: Measurement, Analysis, and Remote Sensing, Dennis H. Goldstein; Russell A. Chipm

Physics

1

Scientific paper

POLDER has been launched on the Japanese ADEOS platform in August 1996. Due to its multi-directional, multispectral and multi-polarization capabilities, this new radiometer gives useful information on the clouds and on their influence on the radiation in the shortwave range. The POLDER bidirectional observation capability provides the polarization signatures within a large range of scattering angles in three spectral bands centered on 443, 670 and 865 nm with a spatial resolution of 7km X 7km. These original features allow to obtain some information both on cloud thermodynamic phase and even on the cloud microphysic of particles. Cloud phase recognition is important for cloud studies. Ice crystals correspond to physical process and properties that differ from those of liquid water drops. The angular POLDER airborne observations, liquid cloud droplets exhibit the very specific polarization features of the rainbow for scattering angels near 140 degrees. Conversely, according to theoretical studies and also to airborne measurements, scattering by various crystalline particles all show that the rainbow characteristics disappear as soon as the particles depart from the spherical shape. In the paper, preliminary results about cloud observations using polarized light measured by the spaceborne version of POLDER are presented, with emphasis on cloud phase detection and microphysic retrieval.

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