| 台风中降雨对中国高分3号合成孔径雷达观测信号的影响 |
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| 引用本文： | 史剑,胡佳臣,邵伟增,王小青,袁新哲,赵良波,李晓峰.台风中降雨对中国高分3号合成孔径雷达观测信号的影响[J].海洋学报(英文版),2019,38(11):121-133. |
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| 作者姓名： | 史剑 胡佳臣 邵伟增 王小青 袁新哲 赵良波 李晓峰 |
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| 作者单位： | 国防科技大学气象与海洋学院, 南京21007,浙江海洋大学海洋科学技术学院, 舟山316000,浙江海洋大学海洋科学技术学院, 舟山316000,中山大学电子与通信工程学院, 广州510275,国家卫星海洋应用服务中心空间海洋遥感与应用重点实验室, 北京100081,航天器系统工程研究所、中国空间技术研究院, 北京100094, 中国,浙江海洋大学海洋科学技术学院, 舟山316000 |
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| 基金项目： | The Fundamental Research Funds for Zhejiang Provincial Universities and Research Institutes under contract No. 2019J00010; the National Key Research and Development Program of China under contract No. 2017YFA0604901; the National Natural Science Foundation of China under contract Nos 41806005, 41676014 and 41776183; the Public Welfare Technical Applied Research Project of Zhejiang Province of China under contract No. LGF19D060003; the Science and Technology Project of Zhoushan City under contract No. 2019C21008. |
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| 摘 要： | Gaofen-3(GF-3), a Chinese civil synthetic aperture radar(SAR) at C-band, has operated since August 2016.Remarkably, several typhoons have been captured by GF-3 around the China Seas over its last two-year mission.In this study, six images acquired in Global Observation(GLO) and Wide ScanSAR(WSC) modes at verticalvertical(VV) polarization channel are discussed. This work focuses on investigating the observation of rainfall using GF-3 SAR. These images were collocated with winds from the European Centre for Medium-Range Weather Forecasts(ECMWF), significant wave height simulated from the WAVEWATCH-III(WW3) model, sea surface currents from climate forecast system version 2(CFSv2) of the National Centers for Environmental Prediction(NCEP) and rain rate data from the Tropical Rainfall Measuring Mission(TRMM) satellite. Sea surface roughness,was compared with the normalized radar cross section(NRCS) from SAR observations, and indicated a 0.8 correlation(COR). We analyzed the dependences of the difference between model-simulated NRCS and SARmeasured NRCS on the TRMM rain rate and WW3-simulated significant wave height. It was found that the effects of rain on SAR damps the radar signal at incidence angles ranging from 15° to 30°, while it enhances the radar signal at incidence angles ranging from 30° to 45° and incidence angles smaller than 10°. This behavior is consistent with previous studies and an algorithm for rain rate retrieval is anticipated for GF-3 SAR.
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| 关 键 词： | Gaofen-3 合成孔径雷达 台风 |
| 收稿时间： | 2019/5/28 0:00:00 |
The impact of rain to observed signal from Chinese Gaofen-3 synthetic aperture radar in typhoons |
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| Shi Jian,Hu Jiachen,Shao Weizeng,Wang Xiaoqing,Yuan Xinzhe,Zhao Liangbo and Li Xiaofeng.The impact of rain to observed signal from Chinese Gaofen-3 synthetic aperture radar in typhoons[J].Acta Oceanologica Sinica,2019,38(11):121-133. |
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| Authors: | Shi Jian Hu Jiachen Shao Weizeng Wang Xiaoqing Yuan Xinzhe Zhao Liangbo and Li Xiaofeng |
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| Institution: | College of Meteorology and Oceanography, National University of Defense Technology, Nanjing 211101, China,Marine Science and Technology College, Zhejiang Ocean University, Zhoushan 316022, China,Marine Science and Technology College, Zhejiang Ocean University, Zhoushan 316022, China,School of Electronics and Communication Engineering, Sun Yat-sen University, Guangzhou 510275, China,Key Laboratory of Space Ocean Remote Sensing and Application, National Satellite Ocean Application Service, Beijing 100081, China,Institute of Spacecraft System Engineering, China Academy of Space Technology, Beijing 100094, China and Marine Science and Technology College, Zhejiang Ocean University, Zhoushan 316022, China |
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| Abstract: | Gaofen-3 (GF-3), a Chinese civil synthetic aperture radar (SAR) at C-band, has operated since August 2016. Remarkably, several typhoons have been captured by GF-3 around the China Seas over its last two-year mission. In this study, six images acquired in Global Observation (GLO) and Wide ScanSAR (WSC) modes at vertical-vertical (VV) polarization channel are discussed. This work focuses on investigating the observation of rainfall using GF-3 SAR. These images were collocated with winds from the European Centre for Medium-Range Weather Forecasts (ECMWF), significant wave height simulated from the WAVEWATCH-III (WW3) model, sea surface currents from climate forecast system version 2 (CFSv2) of the National Centers for Environmental Prediction (NCEP) and rain rate data from the Tropical Rainfall Measuring Mission (TRMM) satellite. Sea surface roughness, was compared with the normalized radar cross section (NRCS) from SAR observations, and indicated a 0.8 correlation (COR). We analyzed the dependences of the difference between model-simulated NRCS and SAR-measured NRCS on the TRMM rain rate and WW3-simulated significant wave height. It was found that the effects of rain on SAR damps the radar signal at incidence angles ranging from 15° to 30°, while it enhances the radar signal at incidence angles ranging from 30° to 45° and incidence angles smaller than 10°. This behavior is consistent with previous studies and an algorithm for rain rate retrieval is anticipated for GF-3 SAR. |
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| Keywords: | Gaofen-3|synthetic aperture radar|typhoon |
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