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

File Identifier: 12725_iso.xml

Metadata Language: eng; CAN

: utf8

Resource Type: Dataset

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Individual Name: Polar Data Catalogue

Organisation Name: Canadian Cryospheric Information Network

Role: Point Of Contact

Contact Info:

Voice: (519) 888-4567 x32689

Street Address: 200 University Avenue West, University of Waterloo

City: Waterloo

Province/State: Ontario

Postal Code/ZIP: N2L 3G1

Country: Canada

E-Mail Address: pdc@uwaterloo.ca

Metadata Date: 2016-12-20

Metadata Standard Name: North American Profile of ISO 19115:2003

Metadata Standard Version: 2009-01-01

Abstract: 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.

Purpose: Aquatic environments can be considered as ecological hot-spots in barren high-arctic tundra landscapes. Permafrost instability caused by climate change leads to increased transportation of organic-rich matter to these biologically active ecosystems, potentially influencing the global carbon budget. The objectives of this study are to: 1- Measure ebullitive and diffusive CH4 and CO2 fluxes from tundra lakes, varying in shape and size; 2- Describe the properties of organic-rich soils presently or potentially accessible to the aquatic microbiota, and evaluate their lability; 3- Determine to what extent the morphology of water bodies, the properties of the water column, and the flux of organic carbon from surrounding soils are controlling lake emissions of CH4 and CO2.

Language: eng; CAN

Citation:

Contact Info:

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

Date:

Date: 2016-12-20

Date Type: Publication Date

Individual Name: Laurion, Isabelle

Role: Principal Investigator

Individual Name: Preskienis, Vilmantas

Role:

Individual Name: Billet, Michael

Role:

Individual Name: Bouchard, Frederic

Role:

Individual Name: Fortier, Daniel

Role:

Individual Name: Rautio, Milla

Role:

Point Of Contact:

Individual Name: Polar Data Catalogue

Organisation Name: Canadian Cryospheric Information Network

Role: Point Of Contact

Contact Info:

Voice: (519) 888-4567 x32689

Street Address: 200 University Avenue West, University of Waterloo

City: Waterloo

Province/State: Ontario

Postal Code/ZIP: N2L 3G1

Country: Canada

E-Mail Address: pdc@uwaterloo.ca

Online Resource: polardata.ca

Topic Category: Environment and Conservation

Keyword Collection:

Keyword: Bylot Island

Keyword: Carbon dioxide

Keyword: Carbon fluxes

Keyword: Carbon, nitrogen and sulfur analysis (CNS)

Keyword: Climate change

Keyword: Colored dissolved organic material (CDOM)

Keyword: CTD (Conductivity, Temperature, Depth)

Keyword: Dissolved organic carbon (DOC)

Keyword: Erosion

Keyword: Fatty acids

Keyword: Geomorphology

Keyword: GIS

Keyword: Ground penetrating radar

Keyword: Ice wedges

Keyword: Lake

Keyword: Lake ice

Keyword: Lake sediments

Keyword: Loss on ignition (LOI)

Keyword: Methane

Keyword: Multidisciplinary

Keyword: Organic matter

Keyword: Oxygen

Keyword: Peat

Keyword: pH

Keyword: Ponds

Keyword: Thermokarst

Associated Thesaurus: Polar Data Catalogue Thesaurus (Canada)

Keyword: Qarlikturvik Valley, Bylot Island, Nunavut, Canada

Spatial Extent:

West Bounding Longitude: -80

East Bounding Longitude: -80

North Bounding Latitude: 73.1

South Bounding Latitude: 73.1

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Access Constraints: Other Restrictions

Use Constraints: Other Restrictions

Other Constraints: Terms of Use of the Polar Data Catalogue: https://www.polardata.ca/pdcinput/public/termsofuse

Distribution Format:

Format Name: Digital file

Format Version: 1.0

Distributor:

Distributor Contact:

Individual Name: Polar Data Catalogue

Organisation Name: Canadian Cryospheric Information Network

Role: Distributor

Contact Info:

Voice: (519) 888-4567 x32689

Street Address: 200 University Avenue West, University of Waterloo

City: Waterloo

Province/State: Ontario

Postal Code/ZIP: N2L 3G1

Country: Canada

E-Mail Address: pdc@uwaterloo.ca