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Retrieving Atmospheric Water Vapor Profilesinthe North-West Pacific Using AMSU Measurements

WANG Xi1, SONG Guoqiong1, YAO Zhanyu2, LI Wanbiao1   

  1. 1. Department of Atmospheric Sciences, School of Physics, Peking University, Beijing 100871; 2. Key Laboratory for Cloud Physics and Weather Modification of CMA, Chinese Academy of Meteorological Sciences, Beijing 100081;
  • Received:2009-03-11 Online:2010-01-20 Published:2010-01-20



  1. 1. 北京大学物理学院大气科学系, 北京100871; 2. 中国气象科学研究院中国气象局云雾物理环境重点开放实验室, 北京100081;

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

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