Ocean and Polar Research

Korea Institute of Ocean Science & Technology (한국해양과학기술원)
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Seasonal Difference in Linear Trends of Satellite-derived Chlorophyll-a in the East China Sea

위성 해색자료에서 추정한 동중국해 클로로필 선형경향의 계절별 차이

  • Son, Young Baek (Marine Ecosystem Research Division, Korea Institute of Ocean Science & Technology) ;
  • Jang, Chan Joo (Ocean Circulation and Climate Research Division, Korea Institute of Ocean Science & Technology) ;
  • Kim, Sang-Hyun (Departmet of Mechanical Systems Engineering, College of Engineering, Hansung University)
  • 손영백 (한국해양과학기술원 해양생태계연구부) ;
  • 장찬주 (한국해양과학기술원 해양순환.기후연구부) ;
  • 김상현 (한성대학교 공과대학 기계시스템공학과)
  • Received : 2013.04.16
  • Accepted : 2013.06.18
  • Published : 2013.06.30
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Abstract

The purpose of this study is to investigate seasonal difference in linear trends in satellite-derived chlorophyll-a concentration (Chl-a) and their related environmental changes in the South Sea of Korea (SSK) and East China Sea (ECS) for recent 15 years (Jan. 1998~Dec. 2012) by analyzing climatological data of Chl-a, Rrs(555), sea surface wind (SSW) and nutrient. A linear trend analysis of Chl-a data reveals that, during recent 15 years, the spring bloom was enhanced in most of the ECS, while summer and fall blooms were weakened. The increased spring (Mar. - May) Chl-a was associated with strengthened winter (Dec. - Feb.) wind that probably provided more nutrient into the upper ocean from the deep. The causes of decreased summer (Jun. - Aug.) Chl-a in the northern ECS were uncertain, but seemed to be related with the nutrient limitation. Recently (after 2006), low-salinity Changjiang diluted water in the south of Jeju and the SSK had lower phosphate that caused increase in N/P ratio with Chl-a decrease. The decreased fall (Sep. - Nov.) Chl-a was associated with weakened wind that tends to entrain less nutrient into the upper ocean from the deep. This study suggests that phytoplankton in the ECS differently changes in response to environmental changes depending on season and region.

Keywords

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