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Ebullition dominates methane emissions in stratified coastal waters

文献类型：期刊论文

作者Hermans, Martijn1,7; Stranne, Christian2,3,7; Broman, Elias4,7; Sokolov, Alexander7; Roth, Florian5,7; Nascimento, Francisco J. A.4,7; Morth, Carl -Magnus2; ten Hietbrink, Sophie2,3; Sun, Xiaole6,7; Gustafsson, Erik7
刊名SCIENCE OF THE TOTAL ENVIRONMENT
出版日期2024-10-01
卷号945页码:12
关键词Methane Greenhouse gas Ebullition Diffusive flux Stratification Carbon isotopes
ISSN号0048-9697
DOI10.1016/j.scitotenv.2024.174183
通讯作者Hermans, Martijn(martijn.hermans@su.se)
英文摘要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.
WOS关键词CARBON ; HYPOXIA ; DEGRADATION ; MARINE ; MODEL
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
语种英语
WOS记录号WOS:001260956900001
出版者ELSEVIER
源URL[http://ir.qdio.ac.cn/handle/337002/186377]  
专题海洋研究所_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.Univ Helsinki, Dept Geosci & Geog, Environm Geochem Grp, Fac Sci, Helsinki, Finland
2.Stockholm Univ, Dept Geol Sci, Stockholm, Sweden
3.Stockholm Univ, Bolin Ctr Climate Res, Stockholm, Sweden
4.Stockholm Univ, Dept Ecol Environm & Plant Sci, Stockholm, Sweden
5.Univ Helsinki, Tvarminne Zool Stn, Hango, Finland
6.Chinese Acad Sci, Ctr Deep Sea Res, Inst Oceanol, Qingdao, Peoples R China
7.Stockholm Univ, Balt Sea Ctr, Stockholm, Sweden
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.

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来源：海洋研究所

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