In-cloud variability of LIDAR depolarization of polar and midlatitude cirrus

Details In-cloud variability of LIDAR depolarization of polar and midlatitude cirrus In-cloud variability of LIDAR depolarization of polar and midlatitude cirrus

Jun 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003georl..30k..32d&link_type=abstract

Geophysical Research Letters, Volume 30, Issue 11, pp. 32-1, CiteID 1578, DOI 10.1029/2003GL017163

Physics

Atmospheric Composition And Structure: Cloud Physics And Chemistry, Atmospheric Composition And Structure: Transmission And Scattering Of Radiation, Electromagnetics: Scattering And Diffraction, Global Change: Remote Sensing

Scientific paper

LIDAR depolarization is commonly used for discriminating liquid and ice particles. Since depolarization depends in a complicated manner on particle shape and size, in-cloud variability of depolarization has been used as an indicator of the microphysical homogeneity of cirrus. The comparison between midlatitude (Florence, Italy, 43. 60°N) and polar (Dumont d'Urville, Antarctica, 66. 68°S) cirrus showed a lower mean depolarization and a higher in-cloud uniformity of cloud depolarization for polar clouds in the (-80, -50°C) temperature range. A wider in-cloud variability of depolarization was observed in polar clouds at higher temperatures (-50, -30°C), reflecting the presence of supercooled liquid layers. The large in-cloud variability of depolarization in Florence cirrus could be explained with a microphysics that is dynamically and chemically perturbed as compared with the polar site. Aged jet contrails are, in fact, present in many Florence cirrus records.

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