14 December 1998 High-spectral-resolution simulation of the impact on heating rates of cirrus clouds in the far infrared
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Abstract
The far IR spectral region is fundamental for the understanding of the earth's radiation balance, in particular because of a strong cooling to space due to the water vapor rotation band and continuum. Cirrus clouds play an important but poorly characterized role in this spectral region. Using a line-by-line code to model at high resolution the atmospheric transmittance, in association with a multiple scattering radiative transfer scheme, we simulate the impact of cirrus clouds on the atmospheric heating rates in the spectral region from 100 to 1000 cm-1. Compared with clear sky conditions, we find that cirrus clouds induce a heating from the ground to the cloud base at all wave numbers. Within the cloud, a heating effect occurs in the window region, whereas a strong cooling occurs in the far-IR. The particles' shape are modeled with either a size distribution of spheres or randomly oriented spheroids. We show that, for a range of different ice water path and particles, size, for a same average volume of ice per particle, spheroids have a bigger impact than spheres at all wave numbers on the cooling/heating rates as well as for the top of the atmosphere radiances.
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Catherine Naud, Catherine Naud, Jaqueline E. Russell, Jaqueline E. Russell, John E. Harries, John E. Harries, "High-spectral-resolution simulation of the impact on heating rates of cirrus clouds in the far infrared", Proc. SPIE 3495, Satellite Remote Sensing of Clouds and the Atmosphere III, (14 December 1998); doi: 10.1117/12.332673; https://doi.org/10.1117/12.332673
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