Estimation of wind speeds inside Super Typhoon Nepartak from AMSR2 low-frequency brightness temperatures
Lei ZHANG1, Xiaobin YIN2(), Hanqing SHI1, Zhenzhan WANG3, Qing XU4
1. Institute of Meteorology and Oceanography, National University of Defense Technology, Nanjing 211101, China 2. Beijing Piesat Information Technology Co. Ltd, Beijing 100195, China 3. National Space Science Center, Chinese Academy of Sciences, Beijing 100190, China 4. College of Oceanography, Hohai University, Nanjing 211101, China
Accurate estimations of typhoon-level winds are highly desired over the western Pacific Ocean. A wind speed retrieval algorithm is used to retrieve the wind speeds within Super Typhoon Nepartak (2016) using 6.9- and 10.7-GHz brightness temperatures from the Japanese Advanced Microwave Scanning Radiometer 2 (AMSR2) sensor on board the Global Change Observation Mission-Water 1 (GCOM-W1) satellite. The results show that the retrieved wind speeds clearly represent the intensification process of Super Typhoon Nepartak. A good agreement is found between the retrieved wind speeds and the Soil Moisture Active Passive wind speed product. The mean bias is 0.51 m/s, and the root-mean-square difference is 1.93 m/s between them. The retrieved maximum wind speeds are 59.6 m/s at 04:45 UTC on July 6 and 71.3 m/s at 16:58 UTC on July 6. The two results demonstrate good agreement with the results reported by the China Meteorological Administration and the Joint Typhoon Warning Center. In addition, Feng-Yun 2G (FY-2G) satellite infrared images, Feng-Yun 3C (FY-3C) microwave atmospheric sounder data, and AMSR2 brightness temperature images are also used to describe the development and structure of Super Typhoon Nepartak.
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