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Proceedings Paper

Effect of cirrus clouds in the infrared (4 to 100 μm): high-spectral-resolution simulations
Author(s): Jaqueline E. Russell; Richard J. Bantges; Catherine Naud; Joanna D. Haigh
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Paper 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.

Paper Details

Date Published: 14 December 1998
PDF: 9 pages
Proc. SPIE 3495, Satellite Remote Sensing of Clouds and the Atmosphere III, (14 December 1998); doi: 10.1117/12.332674
Show Author Affiliations
Jaqueline E. Russell, Imperial College of Science, Technology and Medicine (United Kingdom)
Richard J. Bantges, Imperial College of Science, Technology and Medicine (United Kingdom)
Catherine Naud, Imperial College of Science, Technology and Medicine (United Kingdom)
Joanna D. Haigh, Imperial College of Science, Technology and Medicine (United Kingdom)


Published in SPIE Proceedings Vol. 3495:
Satellite Remote Sensing of Clouds and the Atmosphere III
Jaqueline E. Russell, Editor(s)

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