Spatial and temporal variations in nutrient and chlorophyll-a concentrations in the northern East China Sea surrounding Cheju Island
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Title
- Spatial and temporal variations in nutrient and chlorophyll-a concentrations in the northern East China Sea surrounding Cheju Island
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Author(s)
- Kim, Dongseon; Choi, Sang Hwa; Kim, Kyung Hee; Shim, JeongHee; Yoo, Sinjae; Kim, Chul Ho
- KIOST Author(s)
- Kim, Dong Seon(김동선); Choi, Sang Hwa(최상화)
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Alternative Author(s)
- 김동선; 최상화; 김경희; 유신재; 김철호
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Publication Year
- 2009-06-15
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Abstract
- Nutrients, chlorophyll-a (Chl-a), and environmental conditions were extensively investigated in the northern East China Sea (ECS) near Cheju Island during five research cruises from 2003 to 2007. In the eastern part of the study area, surface waters were characterized only by the Tsushima Current Water (TCW) during all five cruises. However, the western surface waters changed with season and were characterized by the Yellow Sea Cold Water (YSCW) in spring, the Changjiang Diluted Water (CDW) in summer, and the Yellow Sea Mixed Water (YSMW) in autumn. In spring and autumn, relatively high concentrations of nitrate and phosphate were observed in the surface waters in the western part of the study area, where vertical mixing brought large supplies of nutrients from deep waters. Changes in wind direction occasionally varied the inflow of the Changjiang plume in summer, clearly causing the annual variation in surface nitrate and phosphate concentrations in summer. In summer, the surface distribution of nitrate and phosphate did not coincide with that of silicate in the study area, which probably resulted from the significant drop in the Si:N ratio in the Changjiang plume since construction of the Three Gorges Dam (TGD). Despite large temporal and spatial variations in surface Chl-a concentrations, depth-integrated Chl-a concentrations exhibited little variation temporally and spatially. In the study area, surface Chl-a concentration did not well reflect the standing stocks of phytoplankton. The vertical distribution of Chl-a showed large temporal and spatial variations, and the main factor controlling the vertical distribution of Chl-a in summer was the availability of nitrate. The thermohaline front may play an important role for accumulation of phytoplankton biomass in spring and autumn. (C) 2009 Elsevier Ltd. All rights reserved.
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ISSN
- 0278-4343
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URI
- https://sciwatch.kiost.ac.kr/handle/2020.kiost/4281
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DOI
- 10.1016/j.csr.2009.03.012
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Bibliographic Citation
- CONTINENTAL SHELF RESEARCH, v.29, no.11-12, pp.1426 - 1436, 2009
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Publisher
- PERGAMON-ELSEVIER SCIENCE LTD
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Subject
- CHANGJIANG YANGTZE-RIVER; CHEMICAL HYDROGRAPHY; WATER; KUROSHIO; SUMMER; EXCHANGE; SEAWATER; IMPACTS; ESTUARY; NITRATE
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Keywords
- Nitrate; Phosphate; Silicate; Chlorophyll-a; Northern East China Sea
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Type
- Article
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Language
- English
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Document Type
- Article
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