Title: Concentration, 13C, and 14C of dissolved and ebullition methane, dissolved inorganic carbon, dissolved organic carbon, particulate organic carbon and ebullition CO2 in rivers and thermokarst lakes
Citation: Gonzalez Moguel, Regina; Douglas, Peter; Garnett, Mark; Bass, Adrian; Keenan, Benjamin; Matveev, Alex; et al. (2021). Concentration, 13C, and 14C of dissolved and ebullition methane, dissolved inorganic carbon, dissolved organic carbon, particulate organic carbon and ebullition CO2 in rivers and thermokarst lakes in Northern Quebec, Canada. figshare. Dataset. https://doi.org/10.6084/m9.figshare.13114433.v2
Study Site: Northern Quebec
Purpose: Greenhouse gas emissions from permafrost organic carbon decomposition in lakes and rivers can accelerate global warming. We used radiocarbon (14C) measurements to determine the predominant sources of dissolved organic carbon (DOC), particulate organic carbon (POC), dissolved inorganic carbon (DIC), and methane (CH4) in five thermokarst lakes and three rivers in an area of widespread permafrost degradation in Northern Quebec to assess contributions from thawing permafrost and other old carbon (fixed before CE 1950) reservoirs. We compared emission pathways (dissolved gas and ebullition), seasons (summer and winter), and surface soil type (mineral and peat soils). Modern carbon (fixed after CE 1950) was the dominant source of DOC, DIC, and CH4 of non-peatland aquatic systems, while POC and sediment carbon were predominantly fixed in the last millennia.
Abstract: The dataset includes concentration, 13C, and 14C measurements of dissolved inorganic carbon (DIC), dissolved organic carbon (DOC), particulate organic carbon (POC), total particulate carbon (TPC), sediment carbon and organic carbon, dissolved and ebullition methane (CH4), and ebullition carbon dioxide (CO2) from five lakes and three rivers in an area of sporadic permafrost degradation in Northern Quebec.
We sampled the three thaw lakes SAS2A, SAS2B, and SAS2C, located in a peatland adjacent to the Sasapimakwananisikw River (SAS2 peatland), in August 2018, August 2019, and February 2019. The other two lakes, KWK1 and KWK12, located in the once-glaciated KWK valley adjacent to the Kwakwatanikapistikw River, were sampled in August 2019 and 2019.
Supplemental Information Summary:
Research:
Further Info: Gonzalez Moguel, Regina & Bass, Adrian & Garnett, Mark & Pilote, Martin & Gwinneth, Benjamin & Matveev, Alex & Douglas, Peter. (2021). Radiocarbon Data Reveal Contrasting Sources for Carbon Fractions in Thermokarst Lakes and Rivers of Eastern Canada (Nunavik, Quebec). Journal of Geophysical Research: Biogeosciences. 126. 10.1029/2020JG005938.
Status: Complete
Keywords:
methane,
carbon dioxide,
hydrology,
climate change,
dissolved organic carbon,
Geographical coordinates: North: 55.96, South: 55.96 East: -76.78 West: -76.78
Bounding Temporal Extent: Start Date: 2018-08-01, End
Date: 2019-08-31
