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Proceedings Paper

Study of hyperspectral IR atmospheric sounding with an accurate forward model
Author(s): Peng Zhang; Pascal Brunel; Chaohua Dong; Deming Jiang
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Paper Abstract

With a fast yet accurate infrared radiation transfer model KCARTA, transmittance, radiance and brightness temperature spectra of top of atmosphere (TOA) over thermal infrared region (605-2805cm-1) was simulated. In simulation, the effects of different spectral resolution, response function shape, spectral calibration accuracy, propagation path and surface emissivity were taken into account. The results from forward calculations show: 1) Improvement of spectral resolution changes the probability of present brightness temperature so that more brightness temperature can be observed. Increased observed brightness temperature guarantee atmospheric sounding with better vertical resolution. 2) A small change in response function, spectral calibration, propagation path or surface emissivity will lead in much larger difference on observed brightness temperature for hyperspectral sounding than for low spectral resolution sounding. Therefore, hyperspectral sensor requires more sensitive SNR. Otherwise, the improvement of sounding will be limited. Results here can be taken as a reference in designing future hyperspectral IR sounder and retrieval algorithm.

Paper Details

Date Published: 20 January 2005
PDF: 9 pages
Proc. SPIE 5655, Multispectral and Hyperspectral Remote Sensing Instruments and Applications II, (20 January 2005); doi: 10.1117/12.573056
Show Author Affiliations
Peng Zhang, National Satellite Meteorological Ctr. (China)
Pascal Brunel, Meteo-France (France)
Chaohua Dong, National Satellite Meteorological Ctr. (China)
Deming Jiang, Hunan Meteorological Bureau (China)

Published in SPIE Proceedings Vol. 5655:
Multispectral and Hyperspectral Remote Sensing Instruments and Applications II
Allen M. Larar; Makoto Suzuki; Qingxi Tong, Editor(s)

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