气候变化领域集成服务门户(CCPortal): Autumn destabilization of deep porewater CO2 store in a northern peatland driven by turbulent diffusion

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DOI	10.1038/s41467-021-27059-0
	Autumn destabilization of deep porewater CO2 store in a northern peatland driven by turbulent diffusion
	Campeau A.; Vachon D.; Bishop K.; Nilsson M.B.; Wallin M.B.
发表日期	2021
ISSN	2041-1723
卷号	12 期号:1
英文摘要	The deep porewater of northern peatlands stores large amounts of carbon dioxide (CO2). This store is viewed as a stable feature in the peatland CO2 cycle. Here, we report large and rapid fluctuations in deep porewater CO2 concentration recurring every autumn over four consecutive years in a boreal peatland. Estimates of the vertical diffusion of heat indicate that CO2 diffusion occurs at the turbulent rather than molecular rate. The weakening of porewater thermal stratification in autumn likely increases turbulent diffusion, thus fostering a rapid diffusion of deeper porewater CO2 towards the surface where net losses occur. This phenomenon periodically decreases the peat porewater CO2 store by between 29 and 90 g C m−2 throughout autumn, which is comparable to the peatland’s annual C-sink. Our results establish the need to consider the role of turbulent diffusion in regularly destabilizing the CO2 store in peat porewater. © 2021, The Author(s).
语种	英语
scopus关键词	autumn; carbon cycle; carbon storage; peat; peatland; porewater; stratification; turbulent diffusion
来源期刊	Nature Communications
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/250571
作者单位	Department of Forest Ecology and Management, Swedish University of Agricultural Sciences, Umeå, Sweden; Department of Air, Water and Landscape, Uppsala University, Uppsala, Sweden; Department of Ecology and Environmental Sciences, Umeå University, Umeå, Sweden; Department of Aquatic Sciences and Assessment, Swedish University of Agricultural Sciences, Uppsala, Sweden
推荐引用方式 GB/T 7714	Campeau A.,Vachon D.,Bishop K.,et al. Autumn destabilization of deep porewater CO2 store in a northern peatland driven by turbulent diffusion[J],2021,12(1).
APA	Campeau A.,Vachon D.,Bishop K.,Nilsson M.B.,&Wallin M.B..(2021).Autumn destabilization of deep porewater CO2 store in a northern peatland driven by turbulent diffusion.Nature Communications,12(1).
MLA	Campeau A.,et al."Autumn destabilization of deep porewater CO2 store in a northern peatland driven by turbulent diffusion".Nature Communications 12.1(2021).