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http://dx.doi.org/10.4217/OPR.2013.35.2.147

Seasonal Difference in Linear Trends of Satellite-derived Chlorophyll-a in the East China Sea  

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)
Publication Information
Ocean and Polar Research / v.35, no.2, 2013 , pp. 147-155 More about this Journal
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
seasonal difference; satellite-derived chlorophyll-a; East China Sea; linear trend;
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Times Cited By KSCI : 5  (Citation Analysis)
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