中国沿海HY-2A校正微波辐射计水汽含量数据精度检验方法  

An Accuracy Test Method of HY-2A Calibration Microwave Radiometer Water Vapor Content Data Along China’s Coast

作　　者：范士杰[1] 史航 孙浩[1] 刘焱雄 FAN Shi-jie;SHI Hang;SUN Hao;LIU Yan-xiong(College of Oceanography and Space Informatics,China University of Petroleum,Qingdao 266580,China;First Institute of Oceanography,MNR,Qingdao 266061,China)

机构地区：[1]中国石油大学(华东)海洋与空间信息学院,山东青岛266580 [2]自然资源部第一海洋研究所,山东青岛266061

出　　处：《海洋科学进展》2022年第3期505-512,共8页Advances in Marine Science

基　　金：国家自然科学基金项目——GNSS气象校核海洋二号卫星水汽的模型研究(41876106);山东省自然科学基金项目——基于多源水汽的山东半岛暴雪监测及预警研究(ZR2019MD005)。

摘　　要：为评价“海洋二号”卫星(HaiYang-2A,HY-2A)校正微波辐射计(Calibration Microwave Radiometer,CMR)近海水汽产品精度,以中国沿海全球导航卫星系统(Global Navigation Satellite System,GNSS)业务观测站数据和欧洲中期天气预报中心(European Centre for Medium-Range Weather Forecasts,ECMWF)发布的第五代大气再分析资料(ECMWF Reanalysis 5,ERA5)作为验证数据。首先对选取的GNSS业务观测站数据和CMR水汽含量数据进行时空匹配,两者的观测时间一致、空间范围取为100 km;然后利用精密单点定位方法反演GNSS业务观测站上空的大气可降水量(Precipitable Water Vapor,PWV),同时对1 h分辨率的ERA5再分析资料内插计算,得到CMR水汽数据点处的ERA5 PWV;最后以GNSS PWV和ERA5 PWV为参考,分析2015年CMR水汽产品精度和偏差时空分布。结果表明,CMR水汽含量和GNSS PWV、ERA5 PWV之间的相关系数r均高于0.96,平均均方根误差分别为3.17 mm和1.58 mm,具有较高的精度;CMR水汽含量相对于GNSS PWV和ERA5 PWV的偏差不随季节变化而变化,但CMR水汽含量数据精度随纬度的增加而有所提高。In order to evaluate the accuracy of HY-2A(HaiYang-2A)CMR(Calibration Microwave Radiometer)offshore water vapor products,the data of GNSS(Global Navigation Satellite System)operational observation stations along the coast of China and the reanalysis data of ERA5(European Centre for Medium-Range Weather Forecasts Reanalysis 5)are used as validation data.Firstly,the selected GNSS operational observation station data and CMR water vapor content data are spatial and temporal registered.The observation time of the two data is consistent,and the spatial distance is less than 100 km.Then,the PWV(Precipitable Water Vapor)over the GNSS operational observation station is retrieved by using the precise point positioning method,and the ERA5 PWV at the position of CMR water vapor content data is derived by interpolating the 1h resolution ERA5 reanalysis product.Finally,taking GNSS PWV and ERA5 PWV as references,the temporal and spatial distribution of accuracy and deviation of HY-2A CMR water vapor content products in 2015 is analyzed.The results show that the correlation coefficient r between CMR water vapor content and GNSS PWV and ERA5 PWV is higher than 0.96,and the average root mean square error is 3.17 mm and 1.58 mm respectively,which indicate a high accuracy of CMR water vapor content.There is no seasonal variability in the deviation of CMR water vapor content from GNSS and ERA5 PWVs,however,an increasing accuracy of CMR water vapor content with increasing latitude.

关 键 词：“海洋二号”卫星(HY-2A) 校正微波辐射计 大气可降水量 中国沿海GNSS业务观测 第五代大气再分析资料(ERA5) 

分 类 号：P714[天文地球—海洋科学]