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Nordicana
D136 / DOI :
10.5885/45909CE-7A737542A70C4382
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Data from a photochemical and biological degradation experiment carried out on dissolved organic matter from thermokarstic ponds representing a gradient of erosion and terrestrial inputs, Bylot Island, Nunavut, Canada.
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Flora Mazoyer1,2,
Milla Rautio 3,2,
Isabelle Laurion1,2
1Laboratoire LimnoNord, Centre Eau Terre Environnement, Institut National de la Recherche Scientifique, Québec, Québec, Canada
2Centre d'Études Nordiques, Université Laval, Québec, Québec, Canada
3Département des sciences fondamentales, Université du Québec à Chicoutimi, Chicoutimi, Québec, Canada
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Abstract
These data originate from a dissolved organic matter (DOM) degradation experiment carried out at Bylot Island (Qarlikturvik Valley, 73°09’N, 79°58’W), in the eastern Canadian Arctic. The site is a thick peaty terrain underlain with continuous syngenetic permafrost and structured in ice-wedge polygons. It is covered with thousands of shallow ponds forming a typical polygonal tundra landscape. Water was sampled from 6 thermokarst ponds and a 14-day incubation was carried out between 3rd and 16th July 2017 at the water surface. Water was filtered and distributed into bottles exposed to sunlight or covered from it to generate treatments and evaluate the efficiency of DOM photodegradation and biodegradation. Dissolved organic carbon, along with optical variables characterizing the chromophoric fraction of DOM (a320, SUVA254, fluorescent PARAFAC components…) and microbial abundance, were measured at the beginning and end of the incubation. The originality of the study is that ponds were selected to obtain a gradient of terrestrial inputs from surrounding eroding permafrost soil, including two erosive ice-wedge trough ponds, two stable ice-wedge trough ponds and two coalescent polygon ponds.
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Mazoyer, F., Rautio, M., Laurion, I. 2024. Data from a photochemical and biological degradation experiment carried out on dissolved organic matter from thermokarstic ponds representing a gradient of erosion and terrestrial inputs, Bylot Island, Nunavut, Canada., v. 1.0 (2017-2017). Nordicana D136, doi: 10.5885/45909CE-7A737542A70C4382.
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Mazoyer, F., Rautio, M., Laurion, I. (2024). Browning may promote photodegradation of dissolved organic matter: experimental evidence from Arctic thermokarst ponds, Limnology and Oceanography (submitted) |
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We are grateful to Parks Canada, the Centre for Northern Studies (CEN) and Gilles Gauthier for providing logistic and infrastructure support during this project, and to Thomas Pacoureau for assistance in the field. We would like to thank Jérôme Comte for access to his flow cytometer and his precious advice on cytometry, and Audrey-Anne Boutin for carrying out some of the analyses. This research was funded by a seeding grant from CEN’s Hudsonie21 program, along with Natural Sciences and Engineering Research Council of Canada's discovery and northern supplement grants to Isabelle Laurion and Milla Rautio. We declare no conflict of interest.
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You can request for data from previous versions at nordicana@cen.ulaval.ca.
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Version 1.0
(2017-2017) - Updated July 25, 2024
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Site |
Latitude |
Longitude |
Altitude (m) |
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| More info
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Bylot Island
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73.15 |
-79.983 |
6 |
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