Simulation of high-spectral-resolution infrared signature of overlapping cirrus clouds and mineral dust

Details Simulation of high-spectral-resolution infrared signature of overlapping cirrus clouds and mineral dust Simulation of high-spectral-resolution infrared signature of overlapping cirrus clouds and mineral dust

Feb 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006georl..3304805h&link_type=abstract

Geophysical Research Letters, Volume 33, Issue 4, CiteID L04805

Physics

8

Atmospheric Composition And Structure: Aerosols And Particles (0345, 4801, 4906), Atmospheric Composition And Structure: Cloud/Radiation Interaction, Atmospheric Composition And Structure: Radiation: Transmission And Scattering

Scientific paper

Numerical simulations have been carried out to understand the effects of overlapping cirrus clouds and mineral dust on the high-spectral-resolution infrared spectrum in the 600-2400 cm-1 region. A combination of the discrete ordinates radiative transfer and line-by-line models that account for the multiple scattering and monochromatic molecular absorption in the atmosphere is utilized to simulate the down-looking infrared spectrum at the top of the atmosphere with a resolution of 0.2 cm-1. It is demonstrated that the spectral slope of the infrared radiance in the 800-1000 cm-1 region can be used to discriminate coexisting cirrus-dust scenes from those associated only with cirrus clouds or dust alone. In a case for a cirrus cloud overlapping with a dust layer, the spectral features in the 1100-1200 cm-1 and 1400-1850 cm-1 regions can be potentially useful for retrieving the optical thicknesses of the dust layer and cirrus cloud, respectively.

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