Optimal Gridding Process for GMI Brightness Temperature Using the Backus−Gilbert Method

作     者：Guangcan CHEN Yunfei FU Guangcan CHEN;Yunfei FU

作者机构：School of Earth and Space SciencesUniversity of Science and Technology of ChinaHefei 230026China Hubei Key Laboratory for Heavy Rain Monitoring and Warning ResearchInstitute of Heavy RainChina Meteorological AdministrationWuhan 430205China Anhui Meteorological ObservatoryHefei 230031China 

出 版 物：《Advances in Atmospheric Sciences》 (大气科学进展（英文版）)

年 卷 期：2021年第38卷第11期

页      面：1945-1957页

核心收录：

学科分类：07[理学] 070601[理学-气象学] 0706[理学-大气科学] 0816[工学-测绘科学与技术] 0825[工学-航空宇航科学与技术] 

基　　金：This study was supported by the National Key R&D Program of China(Grant Nos.2018YFC1507200 and 2017YFC1501402) the Second Tibetan Plateau Scientific Expedition and Research(STEP)program(Grant No.2019QZKK0104) an NSFC Project(Grant Nos.91837310,41675041,and 41620104009) the Key Research and Development Projects in Anhui Province(Grant No.201904a07020099),and CLIMATE-TPE(ID 32070)under the framework of the ESA-MOST Dragon 4 program 

主　　题：Backus−Gilbert method optimization satellite passive microwave imager 

摘      要：Satellite microwave instruments have different field of views(FOVs)in different channels.A direct average technique(“direct method)is frequently used to generate gridded datasets in the earth science community.A large FOV will measure radiance from outside the area of a designated grid ***,the direct method will lead to errors in a measurement over a grid cell because some pixels covering areas outside of the cell are involved in the averaging *** Backus−Gilbert method(BG method)is proposed and demonstrated to minimize those *** sampling resolutions(6.5 km×6.0 km,11.5 km×6.0 km,13.0 km×6.0 km)are analyzed based on the scanning characteristics of the Global Precipitation Measurement(GPM)Microwave Imager(GMI)18.9-GHz *** temperatures(TBs)at 0.5 km×0.5 km resolution over eastern China are used to obtain synthetic 18.9-GHz TBs at the three sampling *** direct and BG methods are both applied to create a 25 km×25 km gridded dataset and their related uncertainties are *** indicate the error variances with the direct method are 3.00,3.68 and 4.99 K2 at the three sampling resolutions,*** contrast,the BG method leads to a much smaller error variance than the direct method,especially over areas with a large TB *** GMI orbital measurements are applied to verify the BG method for gridding process is *** BG method could be utilized for general purpose of creating a gridded dataset.