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http://dx.doi.org/10.7846/JKOSMEE.2015.18.3.189

Long-term Variation in Ocean Environmental Conditions of the Northern East China Sea  

Yoon, Sang Chol (Fishery and Ocean Information Division, NFRDI)
Youn, Suk Hyun (Fishery and Ocean Information Division, NFRDI)
Whang, Jae Dong (Fishery and Ocean Information Division, NFRDI)
Suh, Young Sang (Fishery and Ocean Information Division, NFRDI)
Yoon, Yi Yong (Department of Health & Environment, Catholic Kwandong University)
Publication Information
Journal of the Korean Society for Marine Environment & Energy / v.18, no.3, 2015 , pp. 189-206 More about this Journal
Abstract
The present study was conducted to investigate the oceanic characteristics of the northern East China Sea through identification of long-term variation patterns of oceanic environment factors, for the objective of gaining understanding of oceanic environment characteristics of the northern waters of East China Sea, which closely influence the oceanic environments of waters nearby South Korea. The study methodology included the use of oceanographic data (water temperature, salinity, dissolved oxygen, nutrients, and chlorophyll-a) on the northern East China Sea from the Korea Oceanographic Data Center (KODC), collected by season for 20 years between 1995 and 2014. Moreover, for the study on the distribution of nutrients, chlorophyll-a. The main water masses that affected the northern East China Sea during the study period were classified as Changjiang diluted water (CDW), Tiawan current warm water (TCWW), Yellow Sea cold water (YSCW), and Kuroshio source water (KW). The forces of CDW and TCWW that forms on the surface and sub-surface layers had weakened for 20 years and the force of KW that forms on the intermediate layer showed a distinctively decreasing trend. However, YSCW showed a trend of expanding its force. Phosphate and silicate exhibited a decreasing tendency and phosphate showed a pattern of being depleted on the surface layer after 2009. It is determined that one of the reasons for this is the concentration of nutrients introduced through CDW and TCWW being too low. The concentration of chlorophyll-a exhibited an increasing tendency during the study period, the reasons for which are determined to be the influences of increase in water temperature, supply of nutrients via YSCW, and increases in light transmission from decrease in suspended solid due to the construction of the Three Gorges Dam.
Keywords
Water masses; Long-term variation; Changjiang Diluted Water; T Current Warm Water; Yellow Sea Cold Water; Kuroshio Source Water;
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