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Increasing dominance of terrigenous organic matter in circumpolar freshwaters due to permafrost thaw

Wauthy, Maxime and Rautio, Milla and Christoffersen, Kirsten S and Forsström, Laura and Laurion, Isabelle and Mariash, Heather L. and Peura, Sari and Vincent, Warwick F. (2018). Increasing dominance of terrigenous organic matter in circumpolar freshwaters due to permafrost thaw. Limnology and Oceanography Letters. 3 , 186-198
[Journal article]

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Official URL: http://doi.org/10.1002/lol2.10063

Abstract

Climate change and permafrost thaw are unlocking the vast storage of organic carbon held in northern frozen soils. Here, we evaluated the effects of thawing ice‐rich permafrost on dissolved organic matter (DOM) in freshwaters by optical analysis of 253 ponds across the circumpolar North. For a subset of waters in subarctic Quebec, we also quantified the contribution of terrestrial sources to the DOM pool by stable isotopes. The optical measurements showed a higher proportion of terrestrial carbon and a lower algal contribution to DOM in waters affected by thawing permafrost. DOM composition was largely dominated (mean of 93%) by terrestrial substances at sites influenced by thawing permafrost, while the terrestrial influence was much less in waterbodies located on bedrock (36%) or with tundra soils unaffected by thermokarst processes (42%) in the catchment. Our results demonstrate a strong terrestrial imprint on freshwater ecosystems in degrading ice‐rich permafrost catchments, and the likely shift toward increasing dominance of land‐derived organic carbon in waters with ongoing permafrost thaw.

Authors/Creators:Wauthy, Maxime and Rautio, Milla and Christoffersen, Kirsten S and Forsström, Laura and Laurion, Isabelle and Mariash, Heather L. and Peura, Sari and Vincent, Warwick F.
Title:Increasing dominance of terrigenous organic matter in circumpolar freshwaters due to permafrost thaw
Year of publishing :2018
Volume:3
Page range:186-198
Number of Pages:13
Publisher:Association for the Sciences of Limnology and Oceanography, Wiley Periodicals, Inc.
ISSN:2378-2242
Language:English
Publication Type:Journal article
Refereed:Yes
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
(A) Swedish standard research categories 2011 > 1 Natural sciences > 105 Earth and Related Environmental Sciences > Other Earth and Related Environmental Sciences
Keywords:freshwater, permafrost thaw, organic carbon, dissolved organic matter (DOM), greenhouse gases
URN:NBN:urn:nbn:se:slu:epsilon-p-99524
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-p-99524
Additional ID:
Type of IDID
DOI10.1002/lol2.10063
ID Code:16086
Faculty:NJ - Fakulteten för naturresurser och jordbruksvetenskap
Department:(NL, NJ) > Dept. of Forest Mycology and Plant Pathology
(S) > Dept. of Forest Mycology and Plant Pathology
Deposited By: SLUpub Connector
Deposited On:13 May 2019 07:54
Metadata Last Modified:17 Aug 2020 21:03

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