MODIS近红外/红外通道反演大气水汽含量及比较

Derivation and comparison of water vapor between Infrared channels and near infrared channels from moderate resolution imaging spectrometer

对中分辨率成像光谱仪MODIS(moderate resolution imaging spectrometer)反演大气水汽含量的算法过程作了推导和分析,并用TERRA-MODIS数据反演了大气水汽含量。对MODIS近红外、红外通道反演大气水汽含量结果和地面探空数据进行了比较分析。得到了以下主要结论:在晴空区域,两者反演的结果一致性较好;在有云区域,红外通道受云污染导致反演失效,而近红外通道可以很好地完成反演。结果表明,近红外反演方法是可行的。对MODIS近红外通道反演存在的局限性也作了讨论。

A brief deduction and analysis of the algorithm for water vapor derivation was presented by using MODIS data, and an example of water vapor retrieval image was derived. Then the images derived from MODIS Near-Infrared channels and IR channels were compared with Radiosondes, which suggests that over clear land areas the results are complied with each other, and over cloud areas, the derivation of IR channels is ineffective because of cloud pollution. The result indicates that the Near-IR retrieval method is feasible.