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Autumn destabilization of deep porewater CO2 store in a northern peatland driven by turbulent diffusion

Campeau, Audrey and Vachon, D. and Bishop, Kevin and Nilsson, Mats and Wallin, Marcus (2021). Autumn destabilization of deep porewater CO2 store in a northern peatland driven by turbulent diffusion. Nature Communications. 12 :1 , 6857
[Research article]

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Abstract

The CO2 stored in deep peat porewater is viewed as a fixed component of peatland C cycling. Here, the authors reveal a hitherto unknown hydro-physical process that results in sudden losses from this CO2 store every autumn.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.

Authors/Creators:Campeau, Audrey and Vachon, D. and Bishop, Kevin and Nilsson, Mats and Wallin, Marcus
Title:Autumn destabilization of deep porewater CO2 store in a northern peatland driven by turbulent diffusion
Series Name/Journal:Nature Communications
Year of publishing :2021
Volume:12
Number:1
Article number:6857
Number of Pages:13
Publisher:NATURE PORTFOLIO
ISSN:2041-1723
Language:English
Publication Type:Research article
Article category:Scientific peer reviewed
Version:Published version
Copyright:Creative Commons: Attribution 4.0
Full Text Status:Public
Subjects:(A) Swedish standard research categories 2011 > 1 Natural sciences > 105 Earth and Related Environmental Sciences > Climate Research
(A) Swedish standard research categories 2011 > 1 Natural sciences > 105 Earth and Related Environmental Sciences > Oceanography, Hydrology, Water Resources
URN:NBN:urn:nbn:se:slu:epsilon-p-114968
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-p-114968
Additional ID:
Type of IDID
DOI10.1038/s41467-021-27059-0
Web of Science (WoS)000722866700079
ID Code:26939
Faculty:S - Faculty of Forest Sciences
NJ - Fakulteten för naturresurser och jordbruksvetenskap
Department:(S) > Dept. of Forest Ecology and Management
(NL, NJ) > Dept. of Aquatic Sciences and Assessment
Deposited By: SLUpub Connector
Deposited On:08 Feb 2022 15:25
Metadata Last Modified:08 Feb 2022 15:31

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