卫星遥感器中的CO₂ 1.6 μm弱吸收带通道测量信号可以反映CO₂的近地层浓度分布，是温室气体卫星反演的重要通道之一。HITRAN数据库是建立卫星遥感CO₂浓度算法依赖的重要分子光谱参数数据库，目前已经更新到了2012版，不同版本中大气分子谱线参数存在差异。本文利用逐线积分模式LBLRTM，研究了最近3个版本HITRAN数据库（04、08、12版）在CO₂的弱吸收带通道上大气光学厚度、透过率的差异，发现04版计算的气体光学厚度普遍偏高，可对CO₂造成约38 ppm的低估；08版本得到的气体光学厚度与12版本接近，反演相差2 ppm以内。在此基础上，分析了不同HITRAN数据库对整层CO₂变化和近地层CO₂变化的敏感性，结果表明：04版对整层和近地面大气的变化敏感性最强，并且放大了近地层信号；08版与12版对整层或近地层CO₂的敏感度接近，两者经过卷积后得到的信号无差异。

The HITRAN database is vital for building a retrieval algorithm of CO₂ concentration from satellites. Six versions of HITRAN have been published, and HITRAN2012 is currently available. These HITRAN versions have different molecular spectral parameters. This study applies the line-by-line radiative transfer model to simulate gas optical depths and transmittances at the 1.6 μm channel of TanSat for three recent versions (04, 08, and 12) of the HITRAN database. The differences of these databases are compared. The optical depth of version HITRAN2004 is larger than that of the other two versions in gas optical depth, leading to an underestimation of CO₂ concentration by 38 ppm. Meanwhile, the result of version HITRAN2008 is similar to that of version HITRAN2012, with a maximum deviation of 2 ppm. The sensitivity of CO₂ column density and its near-surface value to the different HITRAN versions is also analyzed. The CO₂ column density is more sensitive to version HITRAN2004 than to the other two versions. This density shows similar sensitivity to versions HITRAN2008 and HITRAN2012. Minimal differences are also detected between the two convolved radiative signals with the same slit function.