南黄海-长江口海域溶解氧分布和低氧、酸化特征及其控制因素

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Abstract In this paper, based on hydrographic, chemical and biological data from two cruises conducted in August and November 2019, the spatial-temporal distributions of DO and relationships between DO petterns and physical-biogeochemical processes were focused in the southern Yellow Sea (SYS) and off the Changjiang Estuary (CE) during summer and autumn, and the hypoxic characteristics and acidification environment were explored. The results showed that the contents and distributions of DO corresponded to the current patterns, and the TWC (Taiwan Warm Current)-dominated area off the CE was characterized by low oxygen in summer, while a low-oxygen area existed in the bottom YSCWM (Yellow Sea Cold Water Mass) region in autumn. Influenced by the upwelling, the bottom oxygen-deficient waters off the CE could be uplifted to the upper layers and expanded northeastward. Moreover, the upwelled low-oxygen waters off the CE and the uplift of the middle DO-maximum layer in the YSCWM area were basically consistent with the uplifting trend of the thermocline in summer, which not only reflected the impacts of upwelling on the vertical distributions of DO, but also indicated the existence of upwelling around the YSCWM boundary and in the nearshore area off the CE. Besides, the offshore diluted water in the northeastern region of the CE also contributed to the formation of local low-oxygen zone. Acidification occurred off the CE during summer and also in the YSCWM-dominated area during autumn. Specifically, the acidified area off the CE was generally consistent with the hypoxic zone in summer, and the acidified area located within the YSCWM-dominated region in autumn was basically in accordance with the low-oxygen zone. Overall, the results of this study could provide theoretical guidance for the improvements of low oxygen and acidification in the SYS and off the CE.

Key words： dissolved oxygen (DO) hypoxic zone acidification upwelling Yellow Sea Cold Water Mass (YSCWM) Changjiang Estuary

Received: 11 July 2020

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X843

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	WU Lin-ni
	WEI Qin-sheng
	RAN Xiang-bin
	SUN Jun-chuan
	WANG Bao-dong

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WU Lin-ni,WEI Qin-sheng,RAN Xiang-bin等. Dissolved oxygen distributions, hypoxic and acidification characteristics, and their controlling factors in the southern Yellow Sea and off the Changjiang Estuary[J]. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(3): 1311-1324.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2021/V41/I3/1311

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