MODTRAN: A Moderate Resolution Model for LOWTRAN
MODTRAN: A Moderate Resolution Model for LOWTRAN
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发表时间：
1987-07
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通讯作者：
A. Berk;L. Bernstein;D. Robertson
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作者：
A. Berk;L. Bernstein;D. Robertson
摘要：LOWTRAN计算机代码，其中LOWTRAN 7是最新版本，被广泛用于计算红外，可见光和近紫外光谱区域的大气透射率和/或辐射率; LOWTRAN 7已扩展到包括微波光谱区域。该代码易于使用，运行速度快，并为用户提供了各种各样的大气模型和选项。其光谱分辨率为20 1/cm全宽/半高（FWHM），计算以5 1/cm为增量。本报告介绍了为将LOWTRAN的光谱分辨率从20提高到21/cm（FWHM）所做的工作。具体地说，该计划的技术目标是：1）开发提供2 1/cm分辨率（FWHM）的算法; 2）模拟大气分子的分子吸收作为温度和压力的函数; 3）计算12种LOWTRAN分子种类的能带模型参数;以及4）将LOWTRAN 7能力集成到新算法中，保持与多次散射选项的兼容性。MODTRAN，这一努力的最终产品，是一个中等分辨率的LOWTRAN代码。分子吸收在1 1/cm光谱箱中计算，而计算的其他部分保持不变。受影响的分子种类有：水蒸气、二氧化碳、臭氧、一氧化二氮、一氧化碳、甲烷、氧气、一氧化氮、二氧化硫、二氧化氮、氨和硝酸。
Abstract : The LOWTRAN computer codes, with LOWTRAN 7 being the most current version, are widely used to calculate atmospheric transmittance and/or radiance in the infrared, visible and near ultraviolet spectral regions; LOWTRAN 7 has been extended to include the microwave spectral region. The code is easily used, runs quickly and provides the user with a wide variety of atmospheric models and options. Its spectral resolution is 20 1/cm Full Width/Half Maximum (FWHM) with calculations being done in 5 1/cm increments. This report describes work done to increase LOWTRAN's spectral resolution from 20 to 2 1/cm (FWHM). Specifically, the technical objectives for this program were: 1) to develop algorithms providing 2 1/cm resolution (FWHM); 2) to model molecular absorption of atmospheric molecules as a function of temperature and pressure; 3) to calculate band model parameters for twelve LOWTRAN molecular species; and 4) to integrate the LOWTRAN 7 capabilities into the new algorithms, maintaining compatibility with the multiple scattering option. MODTRAN, the final product of this effort, is a moderate resolution LOWTRAN code. Molecular absorption is calculated in 1 1/cm spectral bins, while the other parts of the calculation remain unchanged. The molecular species affected are: water vapor, carbon dioxide, ozone, nitrous oxide, carbon monoxide, methane, oxygen, nitric oxide, sulfur dioxide, nitrogen dioxide, ammonia and nitric acid.