Abstract: Radiative transfer model for ATOVS (RTTOV) is used to simulate advanced microwave sounding unit (AMSU) channels’sensitivityto water vapor profile ; some of channels are eliminated step by step to establish two retrieving algorithms; and then retrieving matrixes are calculated and applied to retrieve water vapor profiles frombrightness temperatures in July 2006 from AMSU instrument aboard national oceanic and atmospheric administration (NOAA)-16. Compared with reanalysis humidity profiles formnational centers for environmental prediction (NCEP), root mean square(RMS) at 0600UTC and 1800UTC at every single level are within 1. 4g/kg and 1. 7g/kg , respectively. Retrieved water vapor profiles generally agree with NCEP ones ; retrieved products can locate the cloud area and water supply of Typhoon; it can describethe structure of Typhoon at some level.

Key words: water vapor profile, North-West Pacific, statistic retrieval, AMSU, RTTOV

摘要： 采用快速辐射传输模式RTTOV对AMSU所有通道进行水汽廓线的敏感性分析, 并根据模式计算结果逐步剔除相关性小的预报通道, 建立两种水汽廓线反演的统计回归模型;之后利用2006年7月NOAA-16卫星AMSU亮温资料, 计算不同算法下的反演系数矩阵, 回归得出大气水汽廓线。反演廓线经与NCEP 廓线比较, 得到0600UTC 和1800UTC 比湿反演的各层偏差(RMS)分别在1.4g/kg 及1.7g/kg 以内。个例分析发现, 反演廓线与NCEP廓线趋势一致; 反演比湿场可定位台风云区及水汽供应输送带, 具有一定的揭示台风结构的能力。

关键词: 水汽廓线, 西北太平洋, 统计反演, AMSU, RTTOV