摘要
本文提出了一种用三波段（０．８６，１．３５，３．２ｃｍ）地基微波辐射计联合反演雨天大气的水汽总量Ｑ，云路径积分液水含量Ｌ和雨的垂直路径参数的物理迭代方法。１３４份样本数值检验结果表明：当雨强小于２０ｍｍ／ｈ时，反演的Ｑ，Ｌ及雨参数值与模拟真值的相对误差分别在４％，１８％，１３％以内；当雨强超过２０ｍｍ／ｈ时，相对误差分别是２５％，５７％和３％。文中还特别指出，单独用３．２ｃｍ辐射计测小雨雨强时，相对误差很大，而联合反演能大大提高测雨精度。最后，讨论了该方法的实际应用可能性，表明三波段联合，为全天候监测大气中的水，提供了实际可行的途径。
A physically-iterative method is proposed to retrieve the atmospheric precipitable water vapor Q,path-integrated cloud liquid water content L and rain parameters along the path using the measurements of triple-wavelength (0.86,l.35 and 3.2 cm)microwave radiometer.A test with 134 independent samples show,that:when rainfall intensity R is less than 20 mm/h,retative errors(RE)in the retrieved Q,L and rain parameters are less there 4%,18% and 13%,respectively;when R is equal to or greater than 20 mm/h,the RE are 25%,57% and 3%,respectively.In addition, it is pointed out that when R is small, the accuracy of retrieved R would be very poor if retrieval is made using 3.2cm wavelength measurements only;while fairly high accuracy can be obtained by the triple-wavelength combined method.Finally,the feasibility of the triple-wavelength combined method is discussed and this work shows that ground-based triple-wavelength MW radiometer is promising for weater proof and continuous monitoring of water in the atmosphere.
出处
《大气科学》
CSCD
北大核心
1995年第1期21-30,共10页
Chinese Journal of Atmospheric Sciences
基金
国家自然科学基金
关键词
地基
微波遥感
水汽
云
雨
大气参数
ground-based MW radiometer,water vapor,cloud and rain parameters
