High spatiotemporal variability of methane concentrations challenges estimates of emissions across vegetated coastal ecosystems

doi:10.1111/gcb.16177

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	High spatiotemporal variability of methane concentrations challenges estimates of emissions across vegetated coastal ecosystems
	Roth, Florian 1,8; Sun, Xiaole 7,8; Geibel, Marc C.8; Prytherch, John 6; Bruchert, Volker 4,5; Bonaglia, Stefano 2; Broman, Elias 3,8; Nascimento, Francisco 3,8; Norkko, Alf 1,8; Humborg, Christoph 1,8
刊名	GLOBAL CHANGE BIOLOGY
	2022-04-12
页码	15
关键词	blue carbon carbon cycle climate change coastal greenhouse gas emissions methane fluxes
ISSN号	1354-1013
DOI	10.1111/gcb.16177
通讯作者	Roth, Florian(florian.roth@su.se)
英文摘要	Coastal methane (CH4) emissions dominate the global ocean CH4 budget and can offset the "blue carbon" storage capacity of vegetated coastal ecosystems. However, current estimates lack systematic, high-resolution, and long-term data from these intrinsically heterogeneous environments, making coastal budgets sensitive to statistical assumptions and uncertainties. Using continuous CH4 concentrations, delta C-13-CH4 values, and CH4 sea-air fluxes across four seasons in three globally pervasive coastal habitats, we show that the CH4 distribution is spatially patchy over meter-scales and highly variable in time. Areas with mixed vegetation, macroalgae, and their surrounding sediments exhibited a spatiotemporal variability of surface water CH4 concentrations ranging two orders of magnitude (i.e., 6-460 nM CH4) with habitat-specific seasonal and diurnal patterns. We observed (1) delta C-13-CH signatures that revealed habitat-specific CH4 production and consumption pathways, (2) daily peak concentration events that could change >100% within hours across all habitats, and (3) a high thermal sensitivity of the CH4 distribution signified by apparent activation energies of similar to 1 eV that drove seasonal changes. Bootstrapping simulations show that scaling the CH4 distribution from few samples involves large errors, and that similar to 50 concentration samples per day are needed to resolve the scale and drivers of the natural variability and improve the certainty of flux calculations by up to 70%. Finally, we identify northern temperate coastal habitats with mixed vegetation and macroalgae as understudied but seasonally relevant atmospheric CH4 sources (i.e., releasing >= 100 mu mol CH4 m(-2) day(-1) in summer). Due to the large spatial and temporal heterogeneity of coastal environments, high-resolution measurements will improve the reliability of CH4 estimates and confine the habitat-specific contribution to regional and global CH4 budgets.
资助项目	Academy of Finland[294853] ; Walter and Andree de Nottbeck Foundation ; Swedish Research Council Formas[2020-02304]
WOS研究方向	Biodiversity & Conservation ; Environmental Sciences & Ecology
语种	英语
出版者	WILEY
WOS记录号	WOS:000781081200001
内容类型	期刊论文
源URL	[http://ir.qdio.ac.cn/handle/337002/178738]
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	Roth, Florian
作者单位	1.Univ Helsinki, Tvarminne Zool Stn, Hango, Finland 2.Univ Gothenburg, Dept Marine Sci, Gothenburg, Sweden 3.Stockholm Univ, Dept Ecol Environm & Plant Sci, Stockholm, Sweden 4.Stockholm Univ, Bolin Ctr Climate Res, Stockholm, Sweden 5.Stockholm Univ, Dept Geol Sci, Stockholm, Sweden 6.Stockholm Univ, Dept Meteorol, Stockholm, Sweden 7.Chinese Acad Sci, Ctr Deep Sea Res, Inst Oceanol, Qingdao, Peoples R China 8.Stockholm Univ, Baltic Sea Ctr, Stockholm, Sweden
推荐引用方式 GB/T 7714	Roth, Florian,Sun, Xiaole,Geibel, Marc C.,et al. High spatiotemporal variability of methane concentrations challenges estimates of emissions across vegetated coastal ecosystems[J]. GLOBAL CHANGE BIOLOGY,2022:15.
APA	Roth, Florian.,Sun, Xiaole.,Geibel, Marc C..,Prytherch, John.,Bruchert, Volker.,...&Humborg, Christoph.(2022).High spatiotemporal variability of methane concentrations challenges estimates of emissions across vegetated coastal ecosystems.GLOBAL CHANGE BIOLOGY,15.
MLA	Roth, Florian,et al."High spatiotemporal variability of methane concentrations challenges estimates of emissions across vegetated coastal ecosystems".GLOBAL CHANGE BIOLOGY (2022):15.