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

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

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

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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(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).

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《地球科学前沿：英文版》 |2022年第1期|90-98|共9页
作者
He FANG; William PERRIE; Gaofeng FAN; Zhengquan LI; Juzhen CAI; Yue HE; Jingsong YANG; Tao XIE; Xuesong ZHU;
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作者单位

Zhejiang Climate Centre;

Hangzhou 310017;

China;

State Key Laboratory of Satellite Ocean Environment Dynamics;

Second Institute of Oceanography;

Ministry of Natural Resources;

Hangzhou 310012;

China;

Shanghai Typhoon Institute;

and Key Laboratory of Numerical Modeling for Tropical Cyclone of China Meteorological Administration;

Shanghai 200030;

China;

Fisheries&Oceans Canada;

Bedford Institute of Oceanography;

Dartmouth B2Y4A2;

Canada;

School of Remote Sensing and Geomatics Engineering;

Nanjing University of Information Science and Technology;

Nanjing 210044;

China;

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原文格式 PDF
正文语种 chi
中图分类天气预报;
关键词
synthetic aperture radar; wind speed; numerical weather predication(NWP); typhoon;

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1. An Improved Method of Retrieving Sea Surface Wind Speed Based on a Four-Layer Medium Model at High Sea States [J] . Jiasheng Tian ,Qiaoyun Liu ,Wan Pan . 地球科学国际期刊（英文） . 2014,第1期

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

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