by Godin.E

New paper by Godin et al. on near surface dynamics in permafrost wetland following gully erosion

July 29, 2015 in Article, post by Godin.E

After Ward Hunt Island, Melville Island

July 29, 2015 in post by Davesne.G

As they return from Ward Hunt Island, the Geocryolab team of Daniel Fortier, Gautier Davesne and Michel Paquette will split up. While the rest of the team will head back south with the precious samples collected on Ward Hunt, Michel will keep going for a few more weeks, heading west to Melville Island (Figure 1) on a new collaborative project between the Geocryolab and Scott Lamoureux’s Cape Bounty Arctic Watershed Observatory (CBAWO – Queen’s University). Along with Ashely Rudy (PhD candidate), Michel will use the lab’s Ground Penetrating Radar and core sampling drill to identify zones of high ice content, which are causing large disturbances on the slopes. At thaw, the melting of ice-rich layers causes soil liquefaction and slope failures, occuring as active-layer detachments slides. These landslides modify the hydrographic network and sedimentary transport in rivers, and could change the water quality in rivers and in the lakes in the area.

 

 

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Figure 1: Study site at Melville Island in the Arctic archipelago

 

by Godin.E

New contribution from Frédéric Bouchard et al. on greenhouse gases emitted from fresh water ecosystems in the high Arctic

July 27, 2015 in Article, Paper by Godin.E

by Kate G.

Imminent Geocryolab team takeoff to Ward Hunt Island!

July 8, 2015 in post by Kate G.

July 21st 2015, a team from Geocryolab composed of Daniel Fortier (director), Michel Paquette (Ph. D. candidate) and Gautier Davesne (Ph. D. candidate) will fly to Ward Hunt Island (Nunavut) for a 3 weeks session fieldwork.

Since 2011, the Geocryolab conducted studies in this unique site to understand the morphology of the Ward Hunt lake watershed. The focus has been on hill slope morphology and on mass/energy transfer dynamics between the land and the lake (For more details, see the projects of M. Paquette and M. Verpaelst).

The 2015 fieldwork will consist of collecting the final data for M. Paquette’s project and new data for G. Davesne and F. Bouchard (post-doc) respective projects.

The objectives are:

  1.  to make GPR surveys on the slopes and the shores of the lake, especially in the deltaic areas, in order to acquire an imagery of the ground layering and discontinuities;
  2. to collect bathymetric data to develop high resolution 3 D map of the lake-bottom morphology;
  3. to extract lake-sediments cores in the deeper zones of the lake in order to date the sediment sequences using physico-chemical, biological and sedimentary proxies;
  4. to extract ground-sediment cores on the slopes and the shore of the lake in order to analyze the physical and geotechnical properties (grain size, thaw settlement);
  5. to continue the survey of water track for their geomorphological, physical, thermal and geochemical characteristics.
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Ward Hunt Island in July 2012 (Photo: M. Paquette)