Korean Journal of Remote Sensing (대한원격탐사학회지)

Korean Society of Remote Sensing (대한원격탐사학회)
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High Resolution Ocean Color Products Estimation in Fjord of Svalbard, Arctic Sea using Landsat-8 OLI

Landsat-8 OLI를 이용한 북극해 스발바드 피요르드의 고해상도 Ocean Color Product 산출

  • Kim, Sang-Il (Division of Polar Ocean Environment, Korea Polar Research Institute) ;
  • Kim, Hyun-Cheol (Division of Polar Ocean Environment, Korea Polar Research Institute) ;
  • Hyun, Chang-Uk (Division of Polar Ocean Environment, Korea Polar Research Institute)
  • 김상일 (극지연구소 극지해양환경연구부) ;
  • 김현철 (극지연구소 극지해양환경연구부) ;
  • 현창욱 (극지연구소 극지해양환경연구부)
  • Received : 2014.12.03
  • Accepted : 2014.12.23
  • Published : 2014.12.31
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Abstract

Ocean Color products have been used to understand marine ecosystem. In high latitude region, ice melting optically influences the ocean color products. In this study, we assessed optical properties in fjord around Svalbard Arctic sea, and estimated distribution of chlorophyll-a and suspended sediment by using high resolution satellite data, Landsat-8 Operational Land Imager (OLI). To estimate chlorophyll-a and suspended sediment concentrations, various regression models were tested with different band ratio. The regression models were not shown high correlation because of temporal difference between satellite data and in-situ data. However, model-derived distribution of ocean color products from OLI showed a possibility that fjord and coastal areas around Arctic Sea can be monitored with high resolution satellite data. To understand climate change pattern around Arctic Sea, we need to understand ice meting influences on marine ecosystem change. Results of this study will be used to high resolution monitoring of ice melting and its influences on the marine ecosystem change at high latitude. KOPRI (Korea Polar Research Institute) has been operated the Dasan station on Svalbard since 2002, and study was conducted using Arctic station.

Ocean Color product들은 해양 생태계를 이해하기 위해 중요한 변수이다. 고위도 지역에서는 해빙이 바다로 유입되어 ocean color product에 광학적인 영향을 미친다. 본 연구에서는 북극 다산기지 근해의 피요르드에 대한 광학적 특성을 평가하고 높은 공간해상도를 가진 Landsat-8 OLI 영상의 엽록소-a(chlorophyll-a)와 부유물질(suspended sediment) 농도를 산출하고자 한다. 엽록소-a와 부유물질 농도를 추정하기 위해서 band ratio를 이용한 다양한 회귀 모델을 테스트했다. 위성영상과 관측된 실측 값과의 시간적인 차이 때문에 사용된 회귀모델은 높은 상관관계를 가지지는 못하였다. 하지만 Landsat-8 OLI 영상을 이용한 모델에서 생산된 엽록소-a와 부유물질 농도는 북극해 주변 피요르드와 해안지역에 대한 고해상도 위성 데이터를 활용한 모니터링 가능성을 보여주었다. 북극해 주변의 기후변화 패턴을 이해하기 위해서는 해양 생태계 변화에 ice meltig이 어떠한 영향을 미치는지를 이해하는 것이 필요하다. 본 연구의 결과는 고위도지역에서 ice melting이 해양생태계 변화에 미치는 영향을 고해상도로 모니터링을 하는데 사용된다. 극지연구소는 2002년부터 스발바드 다산기지을 운영하고 있으며 한국의 북극 기지를 기반으로 연구를 수행하였다.

Keywords

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