Korean Journal of Remote Sensing (대한원격탐사학회지)

Korean Society of Remote Sensing (대한원격탐사학회)
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Estimating Photosynthetically Available Radiation from Geostationary Ocean Color Imager (GOCI) Data

정지궤도 해양관측위성 (GOCI) 자료를 이용한 광합성 유효광량 추정

  • Kim, Jihye (Korea Ocean Satellite Center, Korea Institute of Ocean Science and Technology) ;
  • Yang, Hyun (Korea Ocean Satellite Center, Korea Institute of Ocean Science and Technology) ;
  • Choi, Jong-Kuk (Integrated Ocean Sciences, University of Science & Technology) ;
  • Moon, Jeong-Eon (Korea Ocean Satellite Center, Korea Institute of Ocean Science and Technology) ;
  • Frouin, Robert (Scripps Institution of Oceanography)
  • 김지혜 (한국해양과학기술원 해양위성센터) ;
  • 양현 (한국해양과학기술원 해양위성센터) ;
  • 최종국 (과학기술연합대학원대학교 해양융합학과) ;
  • 문정언 (한국해양과학기술원 해양위성센터) ;
  • Received : 2016.05.25
  • Accepted : 2016.06.22
  • Published : 2016.06.30
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Abstract

Here, we estimated daily Photosynthetically Available Radiation (PAR) from Geostationary Ocean Colour Imager (GOCI) and compared it with daily PAR derived from polar-orbiting MODIS images. GOCI-based PAR was also validated with in-situ measurements from ocean research station, Socheongcho. GOCI PAR showed similar patterns with in-situ measurements for both the clear-sky and cloudy day, whereas MODIS PAR showed irregular patterns at cloudy conditions in some areas where PAR could not be derived due to the clouds of sunglint. GOCI PAR had shown a constant difference with the in-situ measurements, which was corrected using the in-situ measurements obtained on the days of clear-sky conditions at Socheongcho station. After the corrections, GOCI PAR showed a good agreement excepting on the days with so thick cloud that the sensor was optically saturated. This study revealed that GOCI can estimate effectively the daily PAR with its advantages of acquiring data more frequently, eight times a day at an hourly interval in daytime, than other polar orbit ocean colour satellites, which can reduce the uncertainties induced by the existence and movement of the cloud and insufficient images to map the daily PAR at the seas around Korean peninsula.

이 연구에서는 세계최초 해색 위성인 GOCI로부터 일간 광합성 유효광량(Daily PAR)(GOCI PAR)를 추정하였고 이를 극궤도 위성인 MODIS에서 추정한 Daily PAR(MODIS PAR)와 비교하였다. 또 소청초기지 현장자료를 이용하여 GOCI PAR의 정확도를 검증하였다. GOCI PAR는 맑은 날과 구름이 있는 날 모두 현장자료와 비슷한 결과를 보이지만 MODIS PAR는 구름이 있는 날 값이 일정하지 않고, 자료 손실 등으로 인해 값이 추정되지 않는 해역도 존재하였다. 그러나 GOCI PAR와 현장자료 PAR 사이에 일정한 값의 차이가 나타나 소청초 기지의 맑은 날에 해당하는 PAR 값을 이용하여 GOCI PAR를 보정하였다. 보정 결과, 두꺼운 구름의 영향으로 광학적으로 포화된 날을 제외한 나머지 달에서 GOCI PAR 값이 현장자료 PAR 값과 거의 일치하는 것을 보였다. 연구결과, GOCI 자료는 낮 시간 동안 하루 8번의, 극궤도 위성에 비해 많은 자료를 이용하므로, 한반도 주변 해역에서 Daily PAR 생성 시 구름에 의한 이동과 자료의 부족에 의한 오차를 줄일 수 있을 것으로 판단된다.

Keywords

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