多通道亮温数据反演积分水汽算法  

An algorithm for retrieving atmospheric vapor content by multi-brightness temperature

作　　者：于子平[1] 卢建平[2] 杜运理[1] 王晋华[1] 王东吉[1] 雷连发[2] 

机构地区：[1]中国兵器科学研究院,北京100089 [2]西安电子工程研究所,西安710100

出　　处：《高技术通讯》2014年第5期486-491,共6页Chinese High Technology Letters

基　　金：公益性行业(气象)专项科研专项(GYHY201006030)资助项目

摘　　要：针对单通道微波辐射计测量水汽的不足,进行了用多通道辐射计分别测量不同频段的亮温的研究,提出了用多通道亮温数据反演大气积分水汽的算法。以此算法为基础,成功研制了MWP967KV国产双频段多通道微波辐射计,并于2012年用其对北京大气水汽进行了为期两个月的测量,同时与进口辐射计和探空数据进行了对比。试验结果表明,采用多通道亮温数据反演积分水汽的算法可以有效减少因液态水的强烈辐射特性造成的频段干扰,大气积分水汽的计算准确,晴天和雨雪天测量误差分别控制在6%和8%以内,计算测量精度对环境的依赖性小,具有高稳定性。Aiming at the performance insufficiency of a single-path microwave radiometer in water vapor measurement, a study of using a multi-path microwave radiometer to measure the brightness tempercature of different wave bands was conducted, and an algorithm for retrieval of the atmospheric water vapor content from brightness temperature data were proposed. By implementing the algorithm, the MWP967KV, a novel dual frequency, multi channel domestic radiometer, was successfully developed. Using the instrument, a two-month measurement work for measuring Beijing water vapor in 2012 was carried out ,and the data was compared with that of the imported radiometer and the radiosonde. It was found that by using the algorithm, the spectrum interference caused by the strong thermal radiation of the liquid water droplets can be effectively reduced, and a precise result of the water vapor can be achieved with the measurement errors below 6% and 8% in fine and sleet days respectively. The algorithm and the instrument have the great stability and little environment dependence, which is suitable for various conditions.

关 键 词：微波辐射计 水汽密度 湿度延迟 亮温 

分 类 号：P414.51[天文地球—大气科学及气象学] P407.7