Processes controlling the aragonite saturation state in the North Yellow Sea near the Yalu River estuary: contrasting river input effects

Frontiers in Marine Science

Marine Science

Xinyi Wang¹  Jianbo Han²  Zongcai He²  Xuemei Xu²  Hong Chen²  Yingying Hu² 

[1] College of Environment Science and Engineering, Dalian Maritime University, Dalian, China;State Environmental Protection Key Laboratory of Coastal Ecosystem, National Marine Environmental Monitoring Center, Dalian, China;

关键词: coastal acidification;    aragonite saturation state;    dynamic mechanism;    North Yellow Sea;    Yalu river estuary;    river input;   

DOI  :  10.3389/fmars.2023.1158896

 received in 2023-02-04, accepted in 2023-06-07,  发布年份 2023

来源: Frontiers

【 摘 要 】

Understanding the characteristics of the aragonite saturation state (Ωarag) is necessary for assessing impacts of ocean acidification, especially in coastal oceans. Based upon surveys conducted in August and October 2022, the distribution and controlling processes of Ωarag were investigated in the North Yellow Sea near the Yalu River estuary. Surface water Ωarag values exhibited substantial variations of 1.14 to 3.79 for the input of river-diluted water and community production, whereas bottom water Ωarag values ranged from 1.82 to 2.40 in August. In addition, surface water Ωarag was further reduced to 1.07–2.37 in October due to the combined effects of seawater temperature decreasing and the upwelling of bottom water with low Ωarag values, while Ωarag values lowed to 1.04–2.14 in bottom water. Considerably low Ωarag values during summer and autumn in nearshore areas, especially in the Yalu River estuary, were resulted from the input of river-diluted water, while the net community respiration and remineralization induced the low bottom water Ωarag values in offshore areas. We suggest that integrated and multidisciplinary studies are required to quantify the trends and dynamics of acidification and its synergistic effects on the marine ecosystem in estuarine and coastal oceans.

【 授权许可】

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Copyright © 2023 Xu, Hu, He, Wang, Chen and Han