High-resolution sea surface wind speeds of Super Typhoon Lekima (2019) retrieved by Gaofen-3 SAR  

作　　者：He FANG William PERRIE Gaofeng FAN Zhengquan LI Juzhen CAI Yue HE Jingsong YANG Tao XIE Xuesong ZHU 

机构地区：[1]Zhejiang Climate Centre,Hangzhou 310017,China [2]State Key Laboratory of Satellite Ocean Environment Dynamics,Second Institute of Oceanography,Ministry of Natural Resources,Hangzhou 310012,China [3]Shanghai Typhoon Institute,and Key Laboratory of Numerical Modeling for Tropical Cyclone of China Meteorological Administration,Shanghai 200030,China [4]Fisheries&Oceans Canada,Bedford Institute of Oceanography,Dartmouth B2Y4A2,Canada [5]School of Remote Sensing and Geomatics Engineering,Nanjing University of Information Science and Technology,Nanjing 210044,China

出　　处：《Frontiers of Earth Science》2022年第1期90-98,共9页地球科学前沿（英文版）

基　　金：supported in part by the Natural Science Foundation of Zhejiang Province(No.LQ21D060001);the Fengyun Application Pioneering Project(No.FY-APP-2021.0105);the Science and Technology Project of Zhejiang Meteorological Bureau(No.2021YB07);the Innovation and Development Project of China Meteorological Administration(No.CXFZ2022J040);the National Key R&D Program of China(No.2018YFC1506404);the Basic Public Welfare Research Program of Zhejiang Province(No.LGF18D050001);the Climate Change Special Program of China Meteorological Administration(No.CCSF202036);the Key Research and Development Program of Zhejiang Province(No.2021C02036);the Research Program from Science and the Technology Committee of Shanghai(No.19dz1200101);the Shanghai Typhoon Institute(No.2021JB05);the open fund of State Key Laboratory of Satellite Ocean Environment Dynamics,Second Institute of Oceanography,MNR(No.QNHX2012).

摘　　要：Gaofen-3(GF-3)is the first Chinese spaceborne multi-polarization synthetic aperture radar(SAR)instrument at C-band(5.43 GHz).In this paper,we use data collected from GF-3 to observe Super Typhoon Lekima(2019)in the East China Sea.Using a VH-polarized wide ScanSAR(WSC)image,ocean surface wind speeds at 100m horizontal resolution are obtained at 21:56:59 UTC on 8 August 2019,with the maximum wind speed,38.9 m·s^(-1).Validating the SAR-retrieved winds with buoymeasured wind speeds,we find that the root mean square error(RMSE)is 1.86 m·s^(-1),and correlation coefficient,0.92.This suggests that wind speeds retrieved from GF-3 SAR are reliable.Both the European Centre for MediumRange Weather Forecasts(ECMWF)fine grid operational forecast products with spatial resolution,and China Global/Regional Assimilation and Prediction Enhance System(GRAPES)have good performances on surface wind prediction under weak wind speed condition(<24 m·s^(-1)),but underestimate the maximum wind speed when the storm is intensified as a severe tropical storm(>24m·s^(-1)).With respect to SAR-retrieved wind speeds,the RMSEs are 5.24 m·s^(–1) for ECMWF and 5.17 m·s^(–1) for GRAPES,with biases of 4.16 m·s^(–1) for ECMWF and 3.84 m·s^(-1)for GRAPES during Super Typhoon Lekima(2019).

关 键 词：synthetic aperture radar wind speed numerical weather predication(NWP) TYPHOON 

分 类 号：P45[天文地球—大气科学及气象学]