Dissolved organic matter properties and associated light and temperature conditions in degradation experiments with water from tundra ponds on Bylot Island, Nunavut, Canada.

Permafrost thawing mobilizes large quantities of organic carbon that was sequestered in Arctic regions over the last glacial cycle. Processes involved in the oxidation and mineralization of this carbon need to be further assessed to estimate the fraction to be released into the atmosphere as greenhouse gases. This archive contains data from an experiment assessing the short term (12 days) degradation of dissolved organic matter (DOM) collected from four tundra ponds sampled early July on Bylot Island, Nunavut, Canada. Four treatments were applied in situ: 1- Control (C) obtained by filtering water onto 0.2 µm filters incubated in the dark; 2- Sunlight (S) obtained using the same filtered water but incubated under natural sunlight conditions; 3- Bacteria (B) obtained on unfiltered water incubated in the dark; 4- Sunlight and Bacteria (SB) obtained on unfiltered water incubated under natural light conditions. DOM was characterized by absorption scans, matrices of fluorescence (with PARAFAC extraction), and DOC quantification. Bacterial abundance was also followed. Associated environmental data are also included in this archive, specifically thermal profiles during sunny and cloudy days in two ponds, and light (PAR), air temperature and bottle temperatures during the incubations.

Data and Resources

Dataset extent

Map data © OpenStreetMap contributors
Source http://www.cen.ulaval.ca/nordicanad/dpage.aspx?doi=10.5885/45618CE-5D1A86D1850841CD
Version 1.0
Citation Laurion I., Massicotte P., Mazoyer F., Negandhi K., Mladenov N. 2020. Dissolved organic matter properties and associated light and temperature conditions in degradation experiments with water from tundra ponds on Bylot Island, Nunavut, Canada., v. 1.0 (2010-2010). Nordicana D56, doi: 10.5885/45618CE-5D1A86D1850841CD.
Authors
  • Author Name: Isabelle Laurion
  • Author Name: Philippe Massicotte
  • Author Name: Flora Mazoyer
  • Author Name: Karita Negandhi
  • Author Name: Natalie Mladenov
Temporal coverage
  • Temporal coverage start: 2010-07-01  Temporal coverage end: 2010-07-31
Spatial coverage { "coordinates": [ -79.981, 73.158 ], "type": "Point" }
Station cen-whapmagoostui-kuujuarapik-research-station
Variable measured
  • Variable name: Meteorological data and water temperature  Variable description: Data on visible light (PAR) and air temperature during the incubation of water for the experimental decay of dissolved organic matter, and the experimental water temperature in incubation bottles under the sun or in the dark.  Variable unit: unitless
  • Variable name: Temporal dynamic of dissolved organic matter  Variable description: Temporal dynamic of dissolved organic matter and bacterial abundance during the incubation of water from 4 ponds over 12 days. Data include in this order: the spectral absorption (expressed by the absorption coefficient at 320 nm and the spectral slope at 285 nm), the bacterial abundance, the concentration in dissolved organic carbon (DOC), the SUVA index (A254/DOC), the total fluorescence (sum of the fluorescence peaks by the 5 components extracted with PARAFAC, Ftot), the peaks of individual fluorescence components (C1 to C5), and the fluorescence index BIX.  Variable unit: unitless
  • Variable name: Thermal profiles in ponds  Variable description: Thermal profiles of polygonal pond BYL1 (green) and trough pond BYL38 (orange) on a sunny and calm day (18 July) and on a cloudy and windy day (20 July) at 16:00. Stratification is particularly marked in trough ponds on sunny days.  Variable unit: Degree Celsius  Variable URL: http://www.cen.ulaval.ca/nordicanad/infounitedonnees.aspx?id=589331
Measurement Technique
    Date published 2020-03-16
    Date modified 2020-03-16
    Status Public
    Publisher
    • Publisher name: Nordicana D  Publisher URL: http://www.cen.ulaval.ca/nordicanad/en_index.aspx
    Provider
    • Provider name: Centre d'études Nordiques (CEN)  Provider URL: http://www.cen.ulaval.ca/
    License http://www.cen.ulaval.ca/nordicanad/en_modalite.aspx