风云二号卫星资料在雷达降水估测中的应用  

Application of FY-2 Satellite Data in Radar Rainfall Estimation

作　　者：任靖[1,2] 黄勇[2,3] 官莉[1] 叶金印[4] 倪婷 

机构地区：[1]南京信息工程大学大气物理学院,南京210044 [2]安徽省气象科学研究所安徽省大气科学与卫星遥感重点实验室,合肥230031 [3]寿县国家气候观象台,安徽寿县232200 [4]淮河流域气象中心,合肥230031

出　　处：《遥感信息》2017年第3期39-44,共6页Remote Sensing Information

基　　金：国家自然科学基金(41275030);公益性行业(气象)科研专项(GYHY201306040);安徽省自然科学基金(1408085MKL60;1508085MD64);中国气象局项目(CMAGJ2015M28);山西省气象局开放课题(SXKKFY20100101)

摘　　要：针对单一的气象卫星或者天气雷达估测降水存在的一些缺陷,介绍了风云二号(FY-2)气象卫星资料的一种应用方法。先根据红外亮温阈值划分降水云系,再选用适合的雷达反射率因子-降水强度(Z-I)模型进行降水估测;雷达未覆盖区域,基于不同红外亮温区各等级降水及其对应的亮温差的统计结果,查找最接近的降水强度并用不同云型的平均归一化误差进行修正。以2011年6—8月淮河流域地面站点1h雨量计资料为检验资料,验证卫星资料的应用效果。发现添加卫星资料后,会导致原本偏低的雷达估测1h降水量偏高,但准确估测样本量以及相似系数均有所增加;为雷达未覆盖区域降水量的反演提供资料的同时,对于雷达有效覆盖的区域而言,能够去除雷达定量估测降水中的奇异点。In view of the problem of a single satellite or radar quantitative precipitation estimation,this paper introduces an application method of FY-2 meteorological satellite data.First,classify the precipitation cloud system based on infrared brightness temperature threshold.Then,choose suitable radar reflectivity factor and rainfall intensity（Z-I）model for rainfall estimation.As to radar uncovered area,according to the statistical results of precipitation of each grade in various infrared brightness temperature regions and the corresponding brightness temperature difference,find the closest rainfall intensity and then modify it with the average normalized error of different cloud.The ground station pluviometer data of precipitation for one hour in the Huaihe River Basin form June 2011 to August for three month,which are used to verify the impact after adding FY-2 satellite data.It is found that,the addition of FY-2 satellite data leads the radar quantitative estimated precipitation for one hour which was originally lower to be higher.At the same time,both the sample size to accurately estimate precipitation and similarity coefficient has been increased.It could not only provide the data for the precipitation inversion of no radar coverage area,but also could remove the singularity of the radar estimated precipitation.

关 键 词：雷达估测降水 云分类 风云二号卫星 红外亮温阈值 淮河流域 

分 类 号：P412[天文地球—大气科学及气象学]