Seasonal and summer interannual variations of SeaWiFS chlorophyll a in the Yellow Sea and East China Sea

Abstract Seasonal variability in satellite chlorophyll a concentrations (SCHL) in the Yellow Sea and the East China Sea (YECS) was investigated using 10-year averages of monthly data collected between September 1997 and October 2006. Interannual variations were also assessed to help clarify the influence of Changjiang River discharge (CRD) during summer. The YECS was represented by 12 areas each with different seasonal variability in SCHL. SCHL were overestimated during winter due to re-suspension of sediment near the Changjiang Bank and near coastal areas. Increases of SCHL were observed over large areas of the YECS during spring, as would be expected with the occurrence of spring blooms. The spatial distribution of the summer maximum of SCHL shifted from the Changjiang River mouth to just east of Jeju Island from July to September. An eastward shift of the high SCHL water coincided with the movement of the Changjiang diluted water (CDW), taking approximately 2 months to move from Changjiang River mouth to Jeju Island. Summer SCHL between 1998 and 2006 in this region were positively correlated with CRD with a time lag of 0–2 months, suggesting that the interannual variation of SCHL was controlled by the interannual variation of CRD. SCHL during summer in the Yellow Sea gradually increased over the 10 years, indicating possible eutrophication.

[1]  Keiko Yamada,et al.  Seasonal and interannual variability of sea surface chlorophyll a concentration in the Japan/East Sea (JES) , 2004 .

[2]  Jing Zhang,et al.  Nutrient gradients from the eutrophic Changjiang (Yangtze River) Estuary to the oligotrophic Kuroshio waters and re-evaluation of budgets for the East China Sea Shelf , 2007 .

[3]  Gwo-Ching Gong,et al.  Seasonal variation of chlorophyll a concentration, primary production and environmental conditions in the subtropical East China Sea , 2003 .

[4]  J. Kanda,et al.  Environmental control of nitrate uptake in the East China Sea , 2003 .

[5]  Katsuhisa Tanaka,et al.  The long-term freshening and nutrient increases in summer surface water in the northern East China Sea in relation to Changjiang discharge variation , 2008 .

[6]  S. Yoo,et al.  Spatial and temporal variations in nutrient and chlorophyll-a concentrations in the northern East China Sea surrounding Cheju Island , 2009 .

[7]  Katsuhisa Tanaka,et al.  Distribution of Changjiang Diluted Water detected by satellite chlorophyll-a and its interannual variation during 1998–2007 , 2009 .

[8]  Houng-Yung Chen,et al.  Nitrate-based new production and its relationship to primary production and chemical hydrography in spring and fall in the East China Sea , 2003 .

[9]  Yan Bai,et al.  Ecological anomalies in the East China Sea: impacts of the Three Gorges Dam? , 2007, Water research.

[10]  Y. Zhu,et al.  Preliminary study of the dynamic origin of the distribution pattern of bottom sediments on the continental shelves of the Bohai Sea, Yellow Sea and East China Sea , 2000 .

[11]  Su Yu-song,et al.  Water Masses in China Seas , 1994 .

[12]  Guosen Zhang,et al.  Correction to “Characterization of nutrients in the atmospheric wet and dry deposition observed at the two monitoring sites over Yellow Sea and East China Sea” , 2007 .

[13]  Heung-Jae Lie,et al.  Structure and eastward extension of the Changjiang River plume in the East China Sea , 2003 .

[14]  F. Chai,et al.  Physicobiological oceanographic remote sensing of the East China Sea: Satellite and in situ observations , 1998 .

[15]  Takeshi Matsuno,et al.  Long-distance nutrient-transport process in the Changjiang river plume on the East China Sea shelf in summer , 2008 .

[16]  J. Hyun,et al.  Bacterial abundance and production during the unique spring phytoplankton bloom in the central Yellow Sea , 2003 .

[17]  Ken Furuya,et al.  Phytoplankton dynamics in the East China Sea in spring and summer as revealed by HPLC-derived pigment signatures , 2003 .

[18]  Jing Zhang,et al.  Inventory of nutrient compounds in the Yellow Sea , 2003 .

[19]  G. Gong,et al.  Reduction of primary production and changing of nutrient ratio in the East China Sea: Effect of the Three Gorges Dam? , 2006 .

[20]  Chuanlan Lin,et al.  Environmental changes and the responses of the ecosystems of the Yellow Sea during 1976–2000 , 2005 .

[21]  W. Timothy Liu,et al.  Bathymetric effect on the winter sea surface temperature and climate of the Yellow and East China Seas , 2002 .

[22]  Chunyan Li,et al.  Cross-shelf circulation in the Yellow and East China Seas indicated by MODIS satellite observations , 2008 .

[23]  Pil-Hun Chang,et al.  A numerical study on the Changjiang diluted water in the Yellow and East China Seas , 2003 .

[24]  G. Gong,et al.  Reply to comment by Jinchun Yuan et al. on “Reduction of primary production and changing of nutrient ratio in the East China Sea: Effect of the Three Gorges Dam?” , 2007 .

[25]  Sang-Woo Kim,et al.  Empirical ocean-color algorithms to retrieve chlorophyll-a, total suspended matter, and colored dissolved organic matter absorption coefficient in the Yellow and East China Seas , 2011 .

[26]  G. Gong Absorption coefficients of colored dissolved organic matter in the surface waters of the East China Sea , 2004 .

[27]  Y. Kiyomoto,et al.  Ocean Color Satellite Imagery and Shipboard Measurements of Chlorophyll a and Suspended Particulate Matter Distribution in the East China Sea , 2001 .

[28]  Sonia Gallegos,et al.  Development of Suspended Particulate Matter Algorithms for Ocean Color Remote Sensing , 2001 .

[29]  Z. Dai,et al.  Runoff characteristics of the Changjiang River during 2006: Effect of extreme drought and the impounding of the Three Gorges Dam , 2008 .