附加影响因子对红外遥感资料反演大气温湿廓线的辅助作用  

IMPACT ASSESSMENT OF ADDITIONAL PREDICTORS TO THE RETRIEVAL OF ATMOSPHERIC PROFILES FROM INFRARED RADIANCES

作　　者：蒋德明[1] 董超华[2] 曹思沁 

机构地区：[1]湖南省气象科学研究所,湖南长沙410007 [2]国家卫星气象中心,北京100081 [3]湖南省气象局,湖南长沙410007

出　　处：《热带气象学报》2009年第B12期79-84,共6页Journal of Tropical Meteorology

基　　金：国家自然科学基金(40475016);国家民用航天预研究项目(科工技[2002]4402);湖南省科技重大专项(2008FJ1006)共同资助

摘　　要：利用AIRS(Atmospheric Infrared Sounder)实际观测资料和采用特征向量反演方法,研究了非红外遥感因子对红外遥感大气温湿廓线反演的辅助作用。这些因子包括:微波探测通道、纬度、地形、表面高度、表面温度、表面气压等。试验结果表明,微波通道可以明显改善对流层中低层(800hPa以下)温度和湿度的反演结果,对800hPa以上没有明显的作用。划分纬度带有助于提高反演精度。在较平坦的地区温度反演的均方根误差远远小于地形起伏较大的地区。而水汽反演误差对地形变化不敏感。增加附加影响因子对改善对流层中低层温度反演精度有十分明显的作用,对中低层湿度反演精度有一定的改善。Impacts of additional predictors on inverting atmospheric infrared radiance for temperature and humidity profiles are investigated using Atmospheric Infrared Sounder（AIRS） real measurements and empirical orthogonal function expansion method（EOF）. These predictors are microwave channels, latitude, topography, surface altitude, surface temperature, and surface air presure. The results suggest that microwave channels can remarkabely help the improvement of the accuracy of retrieved profiles at lower troposphere （below 800 hPa） and have little effect on that above 800hPa. With the dataset classified by latitude, better retrievals are obtained. The root mean square errors（RMSE） of retrieved tmperature at complicated terrain are significantly greater than that at fiat area. For humidity retrievals it was found that RMSE exhibit weak sensitivity to topography. By use of combined infrared measurements and additional predictors, great improvements have achieved in the retrieval of atmospheric temperature and humidity profdes at lower troposphere.

关 键 词：卫星遥感 统计反演方法 红外 高光谱分辨率 大气廓线 

分 类 号：P412.27[天文地球—大气科学及气象学]