春末东海北部冷涡区环境特征及藻华成因探讨

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Abstract Based on the survey data obtained in the East China Sea (ECS) in the late spring of 2019, the distribution characteristics and spatial patterns of physical and chemical variables, including temperature, salinity, nutrients and chlorophyll a (Chl-a), were analyzed, and the hydrological environment characteristics, nutrients dynamic processes and phytoplankton bloom mechanisms in the cold eddy of the northern ECS were discussed. The low-temperature zone southwest of Cheju Island clearly showed the location of cold eddy in late spring, and the uplift of cold waters in the boundary area of this eddy indicated the presence of upwelling. The southward horizontal transport of the Yellow Sea western coastal current provided a source of nutrients for the cold eddy-dominated area, while the upwelling near the boundary of cold eddy controlled the vertical transport of nutrients to a certain extent. The high-Chl-a zone (with the highest Chl-a value of 5.69μg/dm³) southwest of Cheju Island implied the phytoplankton blooms in late spring, which generally coincided with the location of cold eddy and high-nutrient zone in the northern ECS. Relatively high nutrient levels, good light conditions, and enhanced water-column stability were favorable for the formation of phytoplankton blooms in the cold eddy of the northern ECS. Its suggested that the northwest-southeast front (formed by the confluence of the cold eddy and the southern high-temperature saline water mass) had an essential impact on the spatial pattern and location of the high-Chl-a zone. The relatively low turbidity in the region southwest of Cheju Island increased the vertical depth that could meet the light conditions required for phytoplankton growth, leading to a subsurface Chl-a maximum within the phytoplankton bloom area in the cold eddy of northern ECS. This study provided an essential scientific basis for further understanding the controlling mechanisms of primary production processes in the northern ECS and conducting regional ecosystem dynamics research.

Key words： cold eddy in Northern East China Sea nutrient phytoplankton blooms East China Sea

Received: 16 August 2022

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	ZHAO Yu-hang
	WEI Qin-sheng
	XIN Ming
	XIE Lin-ping
	SUN Xia
	WANG Bao-dong

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ZHAO Yu-hang,WEI Qin-sheng,XIN Ming等. Environmental characteristics and phytoplankton bloom mechanisms in the cold eddy of northern East China Sea in late spring[J]. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(3): 1349-1359.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2023/V43/I3/1349

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