Influence of Improved MODTRAN5 Band Model Spectral Resolution on Background Radiation Calculation in Molecular Absorption Region

Journal of Atmospheric and Environmental Optics ›› 2015, Vol. 10 ›› Issue (3): 205-215.

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Influence of Improved MODTRAN5 Band Model Spectral Resolution on Background Radiation Calculation in Molecular Absorption Region

WANG Yi-ran1, 2, XU Qing-shan1, WEI He-li1，3

(1 Key Laboratory of Atmospheric Composition and Optical Radiation, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 220031, China;
2 Graduate University of Chinese Academy of Sciences, Beijing 100039, China;
3.School of Environmental Science and Optoelectronic Technology, University of Science and Technology of China, Hefei 230026, China)

Received:2014-04-10 Online:2015-05-28 Published:2015-05-18

Abstract

Abstract:

The molecular absorption region has a great advantage on space target detection from the altitude of satellite. The background radiation of the molecular absorption band in infrared region was calculated using the moderate spectral resolution radiative transport model MODTRAN5 at different spectral resolutions. All resolution results of three absorption bands were convolved with the same spectral response function to make an intercomparison and the results show that: for the 4.3 mm region the maximum relative deviation exceeded 10% and the 0.2 cm-1 spectral resolution results had an excellent agreement with the line-by-line calculation; the relative deviation between high and low resolution is rather small at 3.2 mm and 2.7 mm region; the maximum deviation at 2.7 mm region was below 5%. Further intercomparison was carried out between the deviation of MODTRAN4 and MODTRAN5 at 1 cm-1, 5 cm-1 spectral resolution respectively and the line-by-line calculation and the results show that the low resolution MODTRAN5 radiation calculation may result in considerable bias at 4.3 mm region.?

WANG Yi-Ran, XU Qing-Shan, WEI He-Li. Influence of Improved MODTRAN5 Band Model Spectral Resolution on Background Radiation Calculation in Molecular Absorption Region[J]. Journal of Atmospheric and Environmental Optics, 2015, 10(3): 205-215.

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Influence of Improved MODTRAN5 Band Model Spectral Resolution on Background Radiation Calculation in Molecular Absorption Region

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