气候变化领域集成服务门户(CCPortal): Continuing long-term expansion of low-oxygen conditions in the Eastern Gulf of Finland

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DOI	10.1016/j.oceano.2024.02.002
	Continuing long-term expansion of low-oxygen conditions in the Eastern Gulf of Finland
	Stoicescu, Stella-Theresa; Hoikkala, Laura; Fleming, Vivi; Lips, Urmas
发表日期	2024
ISSN	0078-3234
EISSN	2300-7370
起始页码	66
结束页码	1
卷号	66 期号:1
英文摘要	To develop an oxygen indicator for the eastern part of the Gulf of Finland (EGOF), a dataset covering 1900-2021 was compiled. The analysis revealed a long-term declining trend in dissolved oxygen concentrations in the EGOF deep layer of 0.022 mg L-1 a(-1) and multi-decadal variations associated with the observed changes in hydrographic conditions. About 27% of the decline in oxygen concentrations for 1900-2021 and 40% for 1990-2021 can be explained by the decrease in solubility due to the temperature increase and changes in hydrographic conditions. The water volume and bottom area under low oxygen conditions in 2016-2021, characterized by dissolved oxygen concentrations < = 6 mg L-1, have increased, compared to the selected reference period with almost no human impact in the 1920s-1950s, from 9.8 km(3) to 78.0 km(3) (from 2.6% to 20.9% of the EGOF total volume) and from 1190 km(2) to 4950 km(2) (from 13.4% to 56.0% of the EGOF total area), respectively. The environmental status of the EGOF was assessed as not good based on the introduced oxygen indicator. We conclude that, in the longterm, low oxygen conditions have expanded mostly due to the excess load and accumulation of nutrients in the system and temperature-related changes in biogeochemical processes and fluxes. However, on a decadal scale, changes in hydrographic conditions, i.e. stratification and mixing, can significantly impact the sub-surface oxygen conditions in the EGOF and similar estuarine basins.
英文关键词	Dissolved oxygen; Baltic Sea; Eastern Gulf of Finland; Eutrophication; Climate change effects
语种	英语
WOS研究方向	Oceanography
WOS类目	Oceanography
WOS记录号	WOS:001230545500001
来源期刊	OCEANOLOGIA
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/289494
作者单位	Tallinn University of Technology; Finnish Environment Institute; Tallinn University of Technology
推荐引用方式 GB/T 7714	Stoicescu, Stella-Theresa,Hoikkala, Laura,Fleming, Vivi,et al. Continuing long-term expansion of low-oxygen conditions in the Eastern Gulf of Finland[J],2024,66(1).
APA	Stoicescu, Stella-Theresa,Hoikkala, Laura,Fleming, Vivi,&Lips, Urmas.(2024).Continuing long-term expansion of low-oxygen conditions in the Eastern Gulf of Finland.OCEANOLOGIA,66(1).
MLA	Stoicescu, Stella-Theresa,et al."Continuing long-term expansion of low-oxygen conditions in the Eastern Gulf of Finland".OCEANOLOGIA 66.1(2024).