Articles | Volume 19, issue 17
Research article
31 Aug 2022
Research article |  | 31 Aug 2022

The dominant role of sunlight in degrading winter dissolved organic matter from a thermokarst lake in a subarctic peatland

Flora Mazoyer, Isabelle Laurion, and Milla Rautio

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Cited articles

Adams, H. E., Crump, B. C., and Kling, G. W.: Temperature controls on aquatic bacterial production and community dynamics in arctic lakes and streams, Environ. Microbiol., 12, 1319–1333,, 2010. 
Arlen-Pouliot, Y. and Bhiry, N.: Palaeoecology of a palsa and a filled thermokarst pond in a permafrost peatland, subarctic Québec, Canada, The Holocene, 15, 408–419,, 2005. 
Bégin, P. N. and Vincent, W. F.: Permafrost thaw lakes and ponds as habitats for abundant rotifer populations, Arct. Sci., 3, 354–377,, 2017. 
Berggren, M., Laudon, H., and Jansson, M.: Landscape regulation of bacterial growth efficiency in boreal freshwaters, Global Biogeochem. Cy., 21, GB4002,, 2007. 
Berggren, M., Gudasz, C., Guillemette, F., Hensgens, G., Ye, L., and Karlsson, J.: Systematic microbial production of optically active dissolved organic matter in subarctic lake water, Limnol. Oceanogr., 65, 951–961,, 2020. 
Short summary
Dissolved organic matter collected at the end of winter from a peatland thermokarst lake was highly transformed and degraded by sunlight, leading to bacterial stimulation and CO2 production, but a fraction was also potentially lost by photoflocculation. Over 18 days, 18 % of the incubated dissolved organic matter was lost under sunlight, while dark bacterial degradation was negligible. Sunlight could have a marked effect on carbon cycling in organic-rich thermokarst lakes after ice-off.
Final-revised paper