| Shi Jian,Hu Jiachen,Shao Weizeng,Wang Xiaoqing,Yuan Xinzhe,Zhao Liangbo,Li Xiaofeng. 2019. The impact of rain to observed signal from Chinese Gaofen-3 synthetic aperture radar in typhoons. Acta Oceanologica Sinica, 38(11):121－133 |
| The impact of rain to observed signal from Chinese Gaofen-3 synthetic aperture radar in typhoons |
| 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 |
| Received:May 28, 2019 |
| DOI：10.1007/s13131-019-1502-7 |
| Key words:Gaofen-3|synthetic aperture radar|typhoon |
| 中文关键词: Gaofen-3 合成孔径雷达 台风 |
| 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. |
| Author Name | Affiliation | E-mail | | Shi Jian | College of Meteorology and Oceanography, National University of Defense Technology, Nanjing 211101, China | | | Hu Jiachen | Marine Science and Technology College, Zhejiang Ocean University, Zhoushan 316022, China | | | Shao Weizeng | Marine Science and Technology College, Zhejiang Ocean University, Zhoushan 316022, China | shaoweizeng@zjou.edu.cn | | Wang Xiaoqing | School of Electronics and Communication Engineering, Sun Yat-sen University, Guangzhou 510275, China | | | Yuan Xinzhe | Key Laboratory of Space Ocean Remote Sensing and Application, National Satellite Ocean Application Service, Beijing 100081, China | | | Zhao Liangbo | Institute of Spacecraft System Engineering, China Academy of Space Technology, Beijing 100094, China | | | Li Xiaofeng | 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. |
| 中文摘要: |
| 中国民用c波段合成孔径雷达（SAR）高分-3（GF-3）于2016年8月投入使用。值得注意的是，在过去两年的任务中，几架GF-3在中国海域附近捕获了台风。本文对全球观测（GLO）和宽扫描sar （WSC）模式下垂直垂直（VV）偏振通道的六幅图像进行了研究。这项工作重点是调查使用GF-3 SAR观测降雨。这些图片配风从欧洲中期天气预报中心（ECMWF），有效波高的模拟WAVEWATCH-III （WW3）模型，海洋表面电流从气候预测系统版本2（CFSv2）国家环境预报中心（NCEP）和降雨率的数据热带降雨测量任务（TRMM）卫星。将海面粗糙度与SAR观测的归一化雷达截面（NRCS）进行比较，相关性为0.8。分析了模型模拟的NRCS与sar实测NRCS之间的差异对TRMM降雨速率和ww3模拟的显著波高的依赖关系。It发现雨的影响SAR抑制雷达信号的入射角度范围从15°到30°，虽然提高了雷达信号入射角度范围从30°到45°和入射角度小于10°.这一行为与以往的研究相一致，并有望为GF-3 SAR提供一种雨率检索算法。 |
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