Collapse of summer biological activity in the East China Sea during 1998-2014

Title
Collapse of summer biological activity in the East China Sea during 1998-2014
Author(s)
손영백; 이태희; 최동림; 장찬주; 유신재
KIOST Author(s)
Son, Young Baek(손영백)Lee, Taehee(이태희)Jang, Chan Joo(장찬주)
Publication Year
2015-10-15
Abstract
The purpose of this study is to investigate climatological variations from the temporal and spatial surface satellite-driven chlorophyll concentration and to understand the physical mechanism that affect the distribution of chlorophyll in the East China Sea (ECS) during 1998-2014. A linear trend analysis of chlorophyll data reveals that, during recent 17 years, the spring bloom was enhanced in the most of the ECS, while summer and fall blooms were weakened. The increased spring (Mar. - May) chlorophyll was associated with strengthened winter (Dec. - Feb.) wind that probably provided more nutrient into the upper ocean from the deep. The causes of decreased summer (Jun. - Aug.) chlorophyll in the northern ECS were related one or more factors such as river runoff, wind pattern, SST (stratification of the water column), and limited nutrient supply. First, although 17-year summer chlorophyll variations were well correlated with the area influenced by the Changjiang River discharge, their variations was not linearly correlated with the river discharge after 2003. Second, spatially different patterns of chlorophyll were better related to spatial variations of wind-direction that the amount of river discharge during the summer season. Third, the decreased summer chlorophyll seemed to be related with the nutrient limitation. However, the decreased fall (Sep. - Nov.) chlorophyll was associated with weakened wind that tends to he East China Sea (ECS) during 1998-2014. A linear trend analysis of chlorophyll data reveals that, during recent 17 years, the spring bloom was enhanced in the most of the ECS, while summer and fall blooms were weakened. The increased spring (Mar. - May) chlorophyll was associated with strengthened winter (Dec. - Feb.) wind that probably provided more nutrient into the upper ocean from the deep. The causes of decreased summer (Jun. - Aug.) chlorophyll in the northern ECS were related one or more factors such as river runoff, wind pattern, SST (stratification of the water column), and limited nutrient supply. First, although 17-year summer chlorophyll variations were well correlated with the area influenced by the Changjiang River discharge, their variations was not linearly correlated with the river discharge after 2003. Second, spatially different patterns of chlorophyll were better related to spatial variations of wind-direction that the amount of river discharge during the summer season. Third, the decreased summer chlorophyll seemed to be related with the nutrient limitation. However, the decreased fall (Sep. - Nov.) chlorophyll was associated with weakened wind that tends to
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/25252
Bibliographic Citation
2015 PICES annual meeting, pp.1, 2015
Publisher
PICES
Type
Conference
Language
English
Publisher
PICES
Related Researcher
Research Interests

upper ocean dynamics,regional climate modeling,ocean climate change,해양상층역학,지역기후모델링,해양기후변화

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