Diurnal effects in the composition of cirrus clouds

Details Diurnal effects in the composition of cirrus clouds Diurnal effects in the composition of cirrus clouds

May 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003georl..30j..46s&link_type=abstract

Geophysical Research Letters, Volume 30, Issue 10, pp. 46-1, CiteID 1539, DOI 10.1029/2003GL017034

Physics

2

Atmospheric Composition And Structure: Aerosols And Particles (0345, 4801), Meteorology And Atmospheric Dynamics: Radiative Processes, Meteorology And Atmospheric Dynamics: Remote Sensing

Scientific paper

Extended (7-y) polarization lidar data, which are sensitive to ice crystal shape and orientation, are used to search for diurnal changes in cirrus clouds caused by solar heating. Average linear depolarization ratios are ~0.02 lower during the day than night, minimizing at a 45° sun angle at ~0.05 lower than the 0.350 nighttime average. Analysis of the diurnal pattern using scattering simulations suggests that plate crystals are more common during daylight, and that a feedback occurs between solar heating and the maintenance of horizontal plate orientations. This anisotropy also affects the cirrus solar albedo, representing an additional complication confronting climate modelers.

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