Effect of cirrus clouds in the infrared (4 to 100 um): high-spectral-resolution simulations

Jaqueline E. Russell; Richard J. Bantges; Catherine Naud; Joanna D. Haigh

doi:10.1117/12.332674

14 December 1998 Effect of cirrus clouds in the infrared (4 to 100 μm): high-spectral-resolution simulations

Jaqueline E. Russell, Richard J. Bantges, Catherine Naud, Joanna D. Haigh

Proceedings Volume 3495, Satellite Remote Sensing of Clouds and the Atmosphere III; (1998) https://doi.org/10.1117/12.332674
Event: Remote Sensing, 1998, Barcelona, Spain

Abstract

The effect of cirrus clouds in the IR has been simulated at high spectral resolution and the sensitivity to crystal, size, aspect ratio, size distribution and cloud ice water path, has been investigated. The single scattering parameters of the cloud particles were determined using Mie theory for distributions of spheres and the T-Matrix method for spheroids. Cloudy-sky radiances, fluxes and atmospheric heating rates were calculated using the discrete ordinates multiple scattering code, with clear sky atmospheric transmission determined using the GENLN2 line-by-line code. It can be seen from these results that both the volume and the cross section of the cirrus particles are important in determining the spectral variation of the radiance and fluxes and also affect their spectrally integrated values. This implies that particle aspect ratio is a radiatively important parameter in the IR. In order to further investigate these differences, singular value decomposition analysis was carried out on seventy spectra calculated for the 700-2500 cm^-1 spectral region using spheroids of different size and aspect ratio for a range of cloud ice water paths.

Citation Download Citation

Jaqueline E. Russell, Richard J. Bantges, Catherine Naud, and Joanna D. Haigh "Effect of cirrus clouds in the infrared (4 to 100 μm): high-spectral-resolution simulations", Proc. SPIE 3495, Satellite Remote Sensing of Clouds and the Atmosphere III, (14 December 1998); https://doi.org/10.1117/12.332674

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