Journal of the Korean earth science society (한국지구과학회지)

The Korean Earth Science Society (한국지구과학회)
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Estimation of Typhoon Center Using Satellite SAR Imagery

인공위성 SAR 영상 기반 태풍 중심 산정

  • Jung, Jun-Beom (Department of Science Education, Seoul National University) ;
  • Park, Kyung-Ae (Department of Earth Science Education/Research Institute of Oceanography, Seoul National University) ;
  • Byun, Do-Seong (Ocean Research Division, Korea Hydrographic and Oceanographic Agency) ;
  • Jeong, Kwang-Yeong (Ocean Research Division, Korea Hydrographic and Oceanographic Agency) ;
  • Lee, Eunil (Ocean Research Division, Korea Hydrographic and Oceanographic Agency)
  • 정준범 (서울대학교 과학교육과) ;
  • 박경애 (서울대학교 지구과학교육과/해양연구소) ;
  • 변도성 (국립해양조사원 해양과학조사연구실) ;
  • 정광영 (국립해양조사원 해양과학조사연구실) ;
  • 이은일 (국립해양조사원 해양과학조사연구실)
  • Received : 2019.10.10
  • Accepted : 2019.10.28
  • Published : 2019.10.31
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Abstract

Global warming and rapid climate change have long affected the characteristics of typhoons in the Northwest Pacific, which has induced increasing devastating disasters along the coastal regions of the Korean peninsula. Synthetic Aperature Radar (SAR), as one of the microwave sensors, makes it possible to produce high-resolution sea surface wind field around the typhoon under cloudy atmospheric conditions, which has been impossible to obtain the winds from satellite optical and infrared sensors. The Geophysical Model Functions (GMFs) for sea surface wind retrieval from SAR data requires the input of wind direction, which should be based on the accurate estimation of the center of the typhoon. This study estimated the typhoon centers using Sentinel-1A images to improve the problem of typhoon center detection method and to reflect it in retrieving the sea surface wind. The results were validated by comparing with the typhoon best track data provided by the Korea Meteorological Administration (KMA) and Japan Meteorological Agency (JMA), and also by using infrared images of Himawari-8 satellite. The initial center position of the typhoon was determined by using VH polarization, thereby reducing the possibility of error. The detected center showed a difference of 23.76 km on average with the best track data of the four typhoons provided by the KMA and JMA. Compared to the typhoon center estimated by Himawari-8 satellite, the results showed an average spatial variation of 11.80 km except one typhoon located near land with a large difference of 58.73 km. This result suggests that high-resolution SAR images can be used to estimate the center and retrieve sea surface wind around typhoons.

지구온난화와 급속한 기후 변화는 북서 태평양 내 태풍의 특성에 오랫동안 영향을 미쳤고, 이로 인해 한반도 연안에서 치명적인 재해가 증가하고 있다. 마이크로파 센서의 일종인 Synthetic Aperature Radar (SAR)는 위성 광학 및 적외선 센서로는 바람을 구할 수 없는, 흐린 대기 조건인 태풍 주위에서 고해상도 바람장을 생산할 수 있다. SAR 자료로부터 해상풍을 산출하기 위한 Geophysical Model Functions (GMFs)에는 풍향 입력이 필수적이며, 이는 태풍 중심을 정확히 추정하는 것에 기반해야 한다. 본 연구는 태풍 중심 탐지 방법의 문제점을 개선하고 이를 해상풍 산출에 반영하기 위하여, Sentinel-1A 영상을 이용해 태풍 중심을 추정하였다. 그 결과는 한국 및 일본 기상청이 제공한 태풍 경로자료와 비교하여 검증하였고, Himawari-8 위성의 적외 영상도 활용하여 검증하였다. 태풍의 초기 중심 위치는 VH 편파를 이용해 설정하여 오차의 발생 가능성을 줄였다. 탐지된 중심은 한국 및 일본 기상청에서 제공하는 4개 태풍의 경로 자료와 평균 23.76 km의 차이를 보였다. Himawari-8 위성에서 추정된 태풍 중심에 비교했을 때 결과는 육지 근처에 위치하면서 58.73 km의 큰 차이를 보인 한 태풍을 제외하고는 평균 11.80 km의 공간 변이를 보였다. 이는 고해상도 SAR 영상이 태풍 중심을 추정하고 태풍 주위 해상풍 산출에 활용될 수 있음을 시사한다.

Keywords

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