Reduced satellite-driven chlorophyll-a concentration and its related process in the East China Sea during summer 1998-2014

Title
Reduced satellite-driven chlorophyll-a concentration and its related process in the East China Sea during summer 1998-2014
Author(s)
손영백; 이태희; 유신재
KIOST Author(s)
Son, Young Baek(손영백)Lee, Taehee(이태희)
Publication Year
2016-03-25
Abstract
The purpose of this study is to investigate climatological variations from the temporal and spatial surface satellite-driven chlorophyll concentration and to understand their related environmental changes that affect the distribution of chlorophyll in the East China Sea (ECS) during 1998-2014, especially summer season (June ~ August). 17-year monthly mean values of surface satellite-driven chlorophyll-a concentration (SeaWiFS and MODIS), nutrients and recorded Changjiang River discharge data were used to determine reduced summer biological activity. A linear trend analysis of chlorophyll data reveals that, during recent 17 years, the summer chlorophyll-a concentration showed decreased trend. To determine more detailed spatial and temporal variations, we used empirical orthogonal function (EOF) analysis. The first mode is temporally correlated with the area influenced by the Changjiang River discharge and spatially correlated with north-west and south-east patterns. The regional trend between chlorophyll and river discharge determined by K mean analysis showed that reduced summer chlorophyll-a concentrations were correlated with reduced summer Changjiang River discharge in the south of Jeju, Korea. Since the Changjiang River is a major source of nutrients in the ECS, the decreased summer chlorophyll seemed to be related to the change in nutrients in the coastal area before and after impoundment of Three Gorges Damorophyll in the East China Sea (ECS) during 1998-2014, especially summer season (June ~ August). 17-year monthly mean values of surface satellite-driven chlorophyll-a concentration (SeaWiFS and MODIS), nutrients and recorded Changjiang River discharge data were used to determine reduced summer biological activity. A linear trend analysis of chlorophyll data reveals that, during recent 17 years, the summer chlorophyll-a concentration showed decreased trend. To determine more detailed spatial and temporal variations, we used empirical orthogonal function (EOF) analysis. The first mode is temporally correlated with the area influenced by the Changjiang River discharge and spatially correlated with north-west and south-east patterns. The regional trend between chlorophyll and river discharge determined by K mean analysis showed that reduced summer chlorophyll-a concentrations were correlated with reduced summer Changjiang River discharge in the south of Jeju, Korea. Since the Changjiang River is a major source of nutrients in the ECS, the decreased summer chlorophyll seemed to be related to the change in nutrients in the coastal area before and after impoundment of Three Gorges Dam
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/24919
Bibliographic Citation
2016 7th CJK IMBER Symposium, pp.46, 2016
Publisher
IMBER
Type
Conference
Language
English
Publisher
IMBER
Related Researcher
Research Interests

Marine Geochemistry,Marine Environment,Oceanography,해양지화학,해양환경,해양학

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