Korean Journal of Remote Sensing (대한원격탐사학회지)

Korean Society of Remote Sensing (대한원격탐사학회)
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Spatial and Temporal Variations of Satellite-derived 10-year Surface Particulate Organic Carbon (POC) in the East China Sea

동중국해에서 위성에서 추정된 10년 동안의 표층 입자성 유기 탄소의 시/공간적 변화

  • 손영백 (한국해양연구원 해양위성센터) ;
  • 이태희 (한국해양연구원 남해특성연구부) ;
  • 최동림 (한국해양연구원 남해특성연구부) ;
  • 장성태 (한국해양연구원 기후.연안재해연구부) ;
  • 김철호 (한국해양연구원 기후.연안재해연구부) ;
  • 안유환 (한국해양연구원 해양위성센터) ;
  • 유주형 (한국해양연구원 해양위성센터) ;
  • 김문구 (한국해양연구원 남해특성연구부) ;
  • 정섬규 (한국해양연구원 해양특성연구단) ;
  • Received : 2010.05.29
  • Accepted : 2010.08.11
  • Published : 2010.08.31
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Abstract

Surface particulate organic carbon (POC) concentration estimated from Maximum Normalized Difference Carbon Index (MNDCI) algorithm using SeaWiFS data is used to determine spatial and temporal variations of the Changjiang Diluted Water (CDW) in the East China Sea. 10-year monthly POC concentrations (1997-2007) show clearly seasonal variations. Inter-annual variation of POC in whole and three different areas separated by standard deviation is not linearly correlated with the Changjiang River discharge that has decreased after 1998. To determine more detailed spatial and temporal POC variations, we used empirical orthogonal function (EOF) analysis in summer (Jun.-Sep.) from 2000 to 2007. First mode is spatially and temporally correlated with the area influenced by the Changjiang River discharge. Second mode is temporally less sensitive with the Changjiang River discharge but spatially correlated with north-south patterns. Relatively higher POC variations during 2000 and 2003 were shown in the southern East China Sea. These patterns during 2004 and 2007 moved to the northern East China Sea. This phenomenon is better related to spatial variations of wind-direction than the amount of Changjiang River discharge, which is verified from in-situ measurement.

SeaWiFS자료를 Maximum Normalized Difference Carbon Index(MNDCI) 알고리즘을 이용하여 추정된 particulate organic carbon(POC)는 장강에서 유입된 담수의 영향을 받는 동중국해에서 시/공간적 해양환경 변화를 조사하는데 사용했다. 10년 평균한 POC 농도는 (1997년-2007년) 뚜렷한 계절적 변화를 보인다. POC 경년 변화는 전체 지역 평균값과 표준편차를 이용하여 세 개의 지역으로 나누어 평균한 결과에서 1998년 이후 꾸준한 감소를 보이는 장강과는 달리 감소되는 경향이 관측되지 않았다. 자세한 POC 시/공간적인 변화를 관측하기 위하여, 2000년부터 2007년까지 여름철 (6월-9월) 자료를 선정하여 empirical orthogonal function(EOF) 분석을 실시하였다. 첫 번째 성분은 장강으로부터 유입되는 담수의 영향으로 공간적인 변화가 이루어졌다. 두 번째 성분은 장강의 유출량과는 약한 상관관계를 보이고, 공간적으로 남-북 방향의 변화가 관측되었다. 2000년부터 2003년까지 상대적으로 높은 POC 분포는 연구지역 남쪽 부분에서 나타난다. 2004년부터 2007년까지 이런 변화는 연구지역 북쪽 부분에서 관측되었다. 장기적인 변화는 방류량의 감소에 의한 영향보다는 공간적인 변화에 기인한 것으로 사료되며, 이는 현장 관측자료에서 유사한 결과를 보였다.

Keywords

Acknowledgement

Supported by : 한국해양연구원

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