Abstract: MODTRAN2 (1992) is the most recent version of MODTRAN, the Moderate Resolution Atmospheric Radiance and Transmittance Model, first released by the Geophysics Directorate, Phillips Laboratory, in 1990. It encompasses all the capabilities of LOWTRAN 7, the historic 20 cm$+$MIN@1$/ resolution radiance code, but incorporates a much more sensitive molecular band model with 2 cm$+$MIN@1$/ resolution. For inversion algorithm applications, MODTRAN2 must prove to be sufficiently accurate when calculating layer-specific perturbations. First steps in establishing this capability have recently been accomplished. DREV (Defence Research Establishment Valcartier, Canada), in conjunction with the Geophysics Directorate, has taken measurements with a surface-based Bomem interferometer (approximately 1 cm$+$MIN@1$/ resolution), with full supporting sonde profiles (z, T, p, and relative humidity). This suggests that the derivative matrices, typically required for inversion algorithms, may be readily (and rapidly) calculated using MODTRAN whenever its spectral resolution is adequate. !34
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机译：摘要：MODTRAN2（1992）是MODTRAN的最新版本，即中等分辨率大气辐射率和透射率模型，最早由Phillips实验室的地球物理局于1990年发布。它包含LOWTRAN 7的所有功能，历史性的20厘米+ $ MIN @ 1 $ /分辨率辐射代码，但结合了灵敏度更高的分子带模型，分辨率为2 cm $ + $ MIN @ 1 $ /。对于反演算法应用，在计算特定于层的扰动时，必须证明MODTRAN2足够准确。建立此功能的第一步已经完成。 DREV（加拿大瓦尔卡蒂尔防务研究机构）与地球物理局合作，已使用基于地面的波美干涉仪（分辨率约为1 cm $ + $ MIN @ 1 $ /）进行测量，并具有完整的探空剖面图（z， T，p和相对湿度）。这表明反演算法通常需要的导数矩阵，只要其光谱分辨率足够，就可以使用MODTRAN轻松（快速）计算出。 ！34
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