HY-2A校正微波辐射计水汽数据的精度检验和校正  

HY-2A Calibration Microwave Radiometer Water Vapor Product Accuracy Assessment and Error Correction

作　　者：孙浩[1] 范士杰[1] 刘焱雄 彭秀英[1] 史航 SUN Hao

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：《地理空间信息》2022年第1期19-22,I0001,共5页Geospatial Information

基　　金：山东省自然科学基金资助项目(ZR2019MD005);国家自然科学基金资助项目(41876106)。

摘　　要：海洋二号卫星(HY-2A)校正微波辐射计(CMR)水汽产品是全球海洋水汽探测的重要数据源,对于全球天气系统演变和气候变化研究具有重要意义。以ECMWF数据为参考,对2015年CMR海洋、陆地、海冰等不同标识的水汽数据进行了全面的精度检验,分析了CMR海面水汽数据精度的时空分布特征,并对极地海域CMR陆地+海冰异常水汽数据进行了误差分析和线性偏差校正。结果表明,HY-2A CMR海面水汽相对于ECMWF/PWV的平均偏差和均方根误差(RMSE)分别为0.02 mm和2.11 mm,CMR海面水汽与ECMWF/PWV具有很好的一致性;CMR海面水汽数据的精度没有明显的季节性变化,但随着纬度的增加而增加,且南半球精度略优于北半球,具有明显的空间分布特征;CMR陆地+海冰异常水汽数据存在明显的线性系统偏差,经校正后两个区域(60°W附近和100°W附近)CMR水汽的RMSE分别为2.65 mm和1.69 mm,与CMR海面水汽数据的精度基本一致。The HY-2 satellite(HY-2A) calibration microwave radiometer(CMR) water vapor product is an important data source for detecting global ocean water vapor and important for studying global weather system evolution and climate change. We assessed the accuracy of HY-2A CMR water vapor products with different indicators in 2015, with comparison to European Centre for Medium-Range Weather Forecasts(ECMWF) data. Then, we analyzed the spatio-temporal distribution of CMR sea surface water vapor data accuracy. Finally, we conducted errors analysis of CMR abnormal water vapor data with the indicators of land and sea ice in polar seas and carried out linear deviation corrections for the abnormal water vapor data. The results show that the mean deviation and root mean square error(RMSE) of HY-2A CMR water vapor of the sea surface relative to ECMWF/PWV are 0.02 mm and 2.11 mm respectively. CMR water vapor and ECMWF/PWV have good consistency. The CMR sea surface water vapor accuracy has no obvious seasonal variation. The accuracy in the southern hemisphere is higher than that in the northern hemisphere, increases with the increase of latitude, and has obvious spatial distribution characteristics. There is obvious linear system deviation in the CMR water vapor with the indicators of land and sea ice. After linear correction, RMSE of the CMR water vapor in the two regions(around 60° W and 100° W) are 2.65 mm and 1.69 mm respectively, which is basically consistent with the accuracy of CMR water vapor of the sea surface.

关 键 词：HY-2A CMR ECMWF 大气可降水量 精度检验 偏差校正 

分 类 号：P47[天文地球—大气科学及气象学]