TERRAPUB Journal of Oceanography

Journal of Oceanography, Vol. 65 (No. 1), pp. 129-135, 2009

Distribution of Changjiang Diluted Water Detected by Satellite Chlorophyll-a and Its Interannual Variation during 1998-2007

Hyun-cheol Kim1,2*, Hisashi Yamaguchi3, Sinjae Yoo4, Jianrong Zhu5,Kazumaro Okamura6, Yoko Kiyomoto6, Katsuhisa Tanaka6, Sang-Woo Kim7,Taewook Park8, Im Sang Oh8 and Joji Ishizaka9

1Korea Polar Research Institute, Korea Ocean Research and Development Institute, Songdo Techno Park, Songdo, Yeonsu, Incheon 406-840, Korea
2Institute for East China Sea Research, Nagasaki University, Nagasaki 851-2213, Japan
3Graduate School of Science and Technology, Nagasaki University, Nagasaki 852-8521, Japan
4Korea Ocean Research and Development Institute, Ansan 425-600, Korea
5State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200062, China
6Seikai National Fisheries Research Institute, Nagasaki 851-2213, Japan
7National Fisheries Research and Development Institute, Busan, Korea
8School of Earth and Environmental Sciences, Seoul National University, Seoul 151-742, Korea
9Faculty of Fisheries, Nagasaki University, Nagasaki 852-8521, Japan

(Received 7 October 2008; in revised form 16 November 2008; accepted 17 November 2008)

Abstract: Sea-viewing Wide Field-of-view Sensor (SeaWiFS) chlorophyll-a distribution in summer in the East China Sea during 1998-2007 was analyzed. Statistical analysis with K-means clustering technique allowed us to define the proper satellite chlorophyll-a concentration indicating the Changjiang Diluted Water (CDW). The spatial distributions of the higher satellite chlorophyll-a concentrations (>0.48 mg m-3) corresponded well with the distributions of lower salinity CDW (<30-32) every year. Interannual variation of the CDW area, indicated by the high satellite chlorophyll-a, correlated with the interannual variation of the Changjiang summer freshwater discharge. The correlation analysis indicated that the CDW spread eastward in the East China Sea with a time lag of 1 to 2 months after the discharge.

*Corresponding author E-mail: kimhc@kopri.re.kr

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