MODTRAN5中不同光谱分辨率带模式对计算大气吸收带背景辐射的影响

大气与环境光学学报 ›› 2015, Vol. 10 ›› Issue (3): 205-215.

MODTRAN5中不同光谱分辨率带模式对计算大气吸收带背景辐射的影响

王艺然1，2, 徐青山1, 魏合理1，3

(1 中国科学院安徽光学精密机械研究所中国科学院大气成分与光学重点实验室,安徽合肥230031;
2 中国科学院大学，北京100039;
3 中国科学技术大学环境科学与光电技术学院,安徽合肥230031）

收稿日期:2014-04-10 出版日期:2015-05-28 发布日期:2015-05-18
通讯作者: 王艺然（1988-），安徽合肥人，硕士，研究方向为红外辐射传输。 E-mail:hapry.p0tter@qq.com
作者简介:王艺然（1988-），安徽合肥人，硕士，研究方向为红外辐射传输。

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 Published:2015-05-28 Online:2015-05-18

摘要/Abstract

摘要：

大气吸收波段对于从卫星高度向下探测空间亮目标有特殊的优势，使用辐射传输模式MODTRAN5模拟计算了中红外大气吸收波段不同光谱分辨率100 km高度大气背景辐亮度的变化。将三个波段不同分辨率的结果平滑到统一分辨率进行对比表明：4.3 mm不同光谱分辨率相对误差最大可超过10%；其中0.2 cm-1光谱分辨率的计算结果与精确的逐线积分最为接近；3.2 mm与2.7 mm波段不同光谱分辨率的计算结果误差较小，其中2.7 mm波段最大误差小于5%。进一步将MODTRAN4和MODTRAN5的1 cm-1、5 cm-1光谱分辨率计算结果与逐线积分做了比较，表明使用MODTRAN5的低光谱分辨率计算4.3 mm波段的辐亮度可能产生较大误差。

关键词: 背景辐射, 光谱分辨率, MODTRAN5

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.?

王艺然徐青山魏合理. MODTRAN5中不同光谱分辨率带模式对计算大气吸收带背景辐射的影响[J]. 大气与环境光学学报, 2015, 10(3): 205-215.

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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