Ebullition dominates methane emissions in stratified coastal waters

doi:10.1016/j.scitotenv.2024.174183

	Ebullition dominates methane emissions in stratified coastal waters
	Hermans, Martijn 1,2; Stranne, Christian 1,3,4; Broman, Elias 1,5; Sokolov, Alexander 1; Roth, Florian 1,6; Nascimento, Francisco J. A.1,5; Morth, Carl -Magnus 3; ten Hietbrink, Sophie 3,4; Sun, Xiaole 1,7; Gustafsson, Erik 1; Gustafsson, Bo G.1; Norkko, Alf 1,6; Jilbert, Tom 2; Humborg, Christoph 1
	2024-10-01
发表期刊	SCIENCE OF THE TOTAL ENVIRONMENT
ISSN	0048-9697
卷号	945 页码:12
通讯作者	Hermans, Martijn([email protected])
摘要	Coastal areas are an important source of methane (CH4). However, the exact origins of CH4 in the surface waters of coastal regions, which in turn drive sea-air emissions, remain uncertain. To gain a comprehensive understanding of the current and future climate change feedbacks, it is crucial to identify these CH4 sources and processes that regulate its formation and oxidation. This study investigated coastal CH4 dynamics by comparing water column data from six stations located in the brackish Tvarminne Archipelago, Baltic Sea. The sediment biogeochemistry and microbiology were further investigated at two stations (i.e., nearshore and offshore). These stations differed in terms of stratification, bottom water redox conditions, and organic matter loading. At the nearshore station, CH4 diffusion from the sediment into the water column was negligible, because nearly all CH4 was oxidized within the upper sediment column before reaching the sediment surface. On the other hand, at the offshore station, there was significant benthic diffusion of CH4, albeit the majority underwent oxidation before reaching the sediment -water interface, due to shoaling of the sulfate methane transition zone (SMTZ). The po- tential contribution of CH 4 production in the water column was evaluated , was found to be negligible. After examining the isotopic signatures of 6 13 C-CH 4 across the sediment and water column, it became apparent that the surface water 6 13 C-CH 4 values observed in areas with thermal stratification could not be explained by diffusion, advective fluxes, nor production in the water column. In fact, these values bore a remarkable resemblance to those detected below the SMTZ. This supports the hypothesis that the source of CH 4 in surface waters is more likely to originate from ebullition than diffusion in stratified brackish coastal systems.
关键词	Methane Greenhouse gas Ebullition Diffusive flux Stratification Carbon isotopes
DOI	10.1016/j.scitotenv.2024.174183
收录类别	SCI
语种	英语
资助项目	Stockholm University; University of Helsinki; Swedish Research Council[2021-04641]; Swedish Research Council[2018-04350]; Swedish Research Council[2022-04081]; Swedish Research Council[2022-06725]; FORMAS[2020-02304]; National Genomics Infrastructure in Stockholm - Science for Life Laboratory; Knut and Alice Wallenberg Foundation; NAISS/Uppsala Multidisciplinary Center for Advanced Computational Science
WOS研究方向	Environmental Sciences & Ecology
WOS类目	Environmental Sciences
WOS记录号	WOS:001260956900001
出版者	ELSEVIER
WOS关键词	CARBON ; HYPOXIA ; DEGRADATION ; MARINE ; MODEL
引用统计	被引频次：1[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.qdio.ac.cn/handle/337002/186378
专题	深海极端环境与生命过程研究中心
通讯作者	Hermans, Martijn
作者单位	1.Stockholm Univ, Balt Sea Ctr, Stockholm, Sweden 2.Univ Helsinki, Dept Geosci & Geog, Environm Geochem Grp, Fac Sci, Helsinki, Finland 3.Stockholm Univ, Dept Geol Sci, Stockholm, Sweden 4.Stockholm Univ, Bolin Ctr Climate Res, Stockholm, Sweden 5.Stockholm Univ, Dept Ecol Environm & Plant Sci, Stockholm, Sweden 6.Univ Helsinki, Tvarminne Zool Stn, Hango, Finland 7.Chinese Acad Sci, Ctr Deep Sea Res, Inst Oceanol, Qingdao, Peoples R China
推荐引用方式 GB/T 7714	Hermans, Martijn,Stranne, Christian,Broman, Elias,et al. Ebullition dominates methane emissions in stratified coastal waters[J]. SCIENCE OF THE TOTAL ENVIRONMENT,2024,945:12.
APA	Hermans, Martijn.,Stranne, Christian.,Broman, Elias.,Sokolov, Alexander.,Roth, Florian.,...&Humborg, Christoph.(2024).Ebullition dominates methane emissions in stratified coastal waters.SCIENCE OF THE TOTAL ENVIRONMENT,945,12.
MLA	Hermans, Martijn,et al."Ebullition dominates methane emissions in stratified coastal waters".SCIENCE OF THE TOTAL ENVIRONMENT 945(2024):12.