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Pipes or chimneys? For carbon cycling in small boreal lakes, precipitation matters most

de Wit, Heleen A. and Couture, Raoul-Marie and Jackson-Blake, Leah and Futter, Martyn and Valinia, Salar and Austnes, Kari and Guerrero, Jose-Luis and Lin, Yan (2018). Pipes or chimneys? For carbon cycling in small boreal lakes, precipitation matters most. Limnology and Oceanography Letters. 3 , 275-284
[Research article]

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Abstract

Are small lakes passive pipes transporting terrigenous organic carbon (dissolved organic carbon [DOC]), or chimneys for CO2 release in the landscape? Using a unique combination of 30-yr measurements, sediment dating and modeling of a small humic lake and its catchment in southeast Norway, we calculated lateral DOC fluxes and in-lake retention. Concentrations and fluxes rose significantly, driven by declining sulfur deposition and increased precipitation. In-lake retention (% of inputs) declined because of higher discharge and lower residence times. DOC removal rates were not sensitive to residence time. Modeled in-lake DOC removal was driven primarily by microbial metabolism and, secondarily, by flocculation, suggesting that the likely fate of lake-retained DOC is CO2 evasion to the atmosphere. Precipitation was the overriding landscape control on DOC fluxes and retention. In a wetter climate, small northern lakes will, on balance, function more as pipes than chimneys, with increasing lateral DOC fluxes but little change in CO2 production.

Authors/Creators:de Wit, Heleen A. and Couture, Raoul-Marie and Jackson-Blake, Leah and Futter, Martyn and Valinia, Salar and Austnes, Kari and Guerrero, Jose-Luis and Lin, Yan
Title:Pipes or chimneys? For carbon cycling in small boreal lakes, precipitation matters most
Series Name/Journal:Limnology and Oceanography Letters
Year of publishing :2018
Volume:3
Page range:275-284
Number of Pages:10
Publisher:WILEY
ISSN:2378-2242
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 > Oceanography, Hydrology, Water Resources
URN:NBN:urn:nbn:se:slu:epsilon-p-112423
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-p-112423
Additional ID:
Type of IDID
DOI10.1002/lol2.10077
Web of Science (WoS)000456696200022
ID Code:24567
Faculty:NJ - Fakulteten för naturresurser och jordbruksvetenskap
Department:(NL, NJ) > Dept. of Aquatic Sciences and Assessment
Deposited By: SLUpub Connector
Deposited On:18 Jun 2021 12:43
Metadata Last Modified:18 Jun 2021 12:51

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