Influence of geomorphology and organic matter lability on the variability in greenhouse gas emissions from tundra lakes

The PhD fieldwork spans from summer 2014 to summer 2016, however this project relies on the limnological research conducted continuously on Bylot Island since 2005. Limnological profiles were done with a YSI multiparameter probe (T°, pH, conductivity, oxygen). Discrete water samples were collected for nutrients, major anions and cations, dissolved organic matter (Dissolved organic carbon (DOC) and colored dissolved organic material (cDOM) absorption spectra), total suspended solids following standard methods. Discrete measurements of CO2 flux at the water interface were taken using a floating chamber connected to an IRGA (EGM-4, PP-Systems), CO2 and CH4 fluxes were also estimated using dissolved gas concentration and gas transfer models. Ebullition flux was measured using inverted funnels (inspiration from Wik et al. 2013) to collect bubbles for further analysis (gas chromatography, stable isotopes, 14C dating). Bathymetry of larger lakes was obtained with sonar (Bouchard et al. 2015), while a high precision integrated positioning system (GNSS, Trimble R8) was used for shallow ponds. Lake sediment cores were extracted using gravity (Mini-Glew) and percussion corers. Permafrost cores down to 1 m depth were taken with a portable earth-drill system (Calmels et al. 2005). Cores were analysed for loss of ignition (LOI), water content, bulk density, and carbon and nitrogen contents. Fatty acids were analysed in subset of soil samples. Depending on the stratigraphy, selected core layers were incubated over short-term (weeks) under in-situ or laboratory conditions to evaluate the potential of these different carbon sources to fuel microbial activity. During the experiments O2, CO2, CH4, DOC, and optical DOM properties were followed.

Metadata Access
Creator Laurion, Isabelle; Preskienis, Vilmantas; Billet, Michael; Bouchard, Frederic; Fortier, Daniel; Rautio, Milla
Publisher Canadian Cryospheric Information Network
Contributor Polar Data Catalogue
Publication Year 2016
Rights Research programs, CCIN, or ArcticNet take no liability for the use or transmission of this data
OpenAccess true
Contact isabelle.laurion(at); pdc(at)
Language English
Format Computer file
Discipline Environmental Research
Spatial Coverage (-80.000W, 73.100S, -80.000E, 73.100N)
Temporal Coverage Begin 2014-05-01T00:00:00Z
Temporal Coverage End 2016-08-31T00:00:00Z