Limnology and carbon flux dynamic in subarctic thaw ponds (Kuujjuarapik, Nunavik)

Limnological profiles are done with a YSI multiparameter probe (T°, pH, conductivity, oxygen). Discrete water samples are collected for nutrients, major anions and cations, dissolved inorganic (DIC) and organic carbon (DOC), pCO2 and pCH4 (headspace method), total suspended solids (TSS) and particulate organic carbon (POC), following standard methods. Bacterial and primary production were measured in 2008 in plankton and microbial mats using standard and modified methods (Scott et al. 2006, Buesing and Gesnner 2003; Mueller et al. 2006, Rautio et al. 2004; Knap et al. 1996). Phytoplankton is preserved in glutharaldehyde and paraformaldehyde; rotifer in Lugol and bacteria in glutharaldehyde and PMSF. Chlorophyll-a and major pigments were determined in 2007 using HPLC (Zapata et al. 2000). Diversity of picoeukaryotes, Bacteria and Archaea are analyzed with clone libraries and DGGE. Larger phytoplankton cells were identified under the microscope in 10 ponds in 2007. Discrete measurements of surface water CO2 flux are done using a floating chamber connected to an IRGA (EGM-4, PP-Systems). Continuous measurements of dissolved gases (CO2, CH4 and O2) in 3 ponds were done during 6 days in July 2008. GHG fluxes are also estimated using dissolved gas concentration and gas transfer models. Photodegradation rates of dissolved organic matter were estimated in short term experiments (2008+2009), following CDOM optical properties (absorption and fluorescence). Quickbird image taken in 2006

Metadata Access
Creator Isabelle Laurion; Paul-Georges Rossi; Christiane Dupont; Julie Breton; Leira Retamal
Publisher Canadian Cryospheric Information Network
Contributor Polar Data Catalogue
Publication Year 2015
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 (-77.800W, 55.300S, -77.800E, 55.300N)
Temporal Coverage Begin 2005-06-16T00:00:00Z
Temporal Coverage End 9999-12-31T00:00:00Z