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

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Wauthy , M , Rautio , M , Christoffersen , K S , Forsström , L , Laurion , I , Mariash , H L , Peura , S & Vincent , W F 2018 , ' Increasing dominance of terrigenous organic matter in circumpolar freshwaters due to permafrost thaw ' , Limnology and oceanography letters , vol. 3 , no. 3 , pp. 186-198 . https://doi.org/10.1002/lol2.10063

Title: Increasing dominance of terrigenous organic matter in circumpolar freshwaters due to permafrost thaw
Author: Wauthy, Maxime; Rautio, Milla; Christoffersen, Kirsten S.; Forsström, Laura; Laurion, Isabelle; Mariash, Heather L.; Peura, Sari; Vincent, Warwick F.
Contributor organization: Environmental Sciences
Faculty of Biological and Environmental Sciences
Date: 2018
Language: eng
Number of pages: 13
Belongs to series: Limnology and oceanography letters
ISSN: 2378-2242
DOI: https://doi.org/10.1002/lol2.10063
URI: http://hdl.handle.net/10138/238987
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.
Subject: 1172 Environmental sciences
Peer reviewed: Yes
Rights: cc_by
Usage restriction: openAccess
Self-archived version: publishedVersion


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