Core properties of permafrost cores collected in Ward Hunt Island between 2011 and 2016 ...

• Main Authors: Fortier, Daniel, Paquette, Michel, Vincent, Warwick F
• Format: Dataset
• Language: unknown
• Published: Canadian Cryospheric Information Network 2020
• Subjects: Ice; permafrost; polar desert; Ward Hunt Island
• Online Access: https://dx.doi.org/10.5884/12937; https://www.polardata.ca/pdcsearch/?doi_id=12937

Cores where collected between 2012 and 2015 using a portable earth auger modified to fit a 8.25 to 10.8 cm core barrel. Cores where kept frozen at -20°C in the field and brought back to the Geocryolab (University of Montreal) for analysis. In a cold room, cores where cleaned of the coring mud, photographed, described and subsampled in 5-15 cm core, and then sealed in vacuumed plastic bags. Core size could not be kept consistent as high gravel content prevented us from cutting the cores, which had to be broken using a hammer and chisel. Volumetric ice content was determined using a water displacement method (see Verpaelst et al. 2017 in Arctic Science for details). Cores were then thawed in their vaccuum sealed bag, and aliquots were collected and filtered through 0.22 micron PVDF filters into plastic bottles for ion and isotopic analysis. Water from the cores was also used to measure pH and electrical conductivity (corrected to 25°C). Water isotopic signature was measured at the Environmental Variability and ... : Permafrost cores were collected in order to determine permafrost properties and ice content during an investigation of permafrost properties. The research was conducted during geomorphological surveys of the Ward Hunt Island and were part of a study on mass movement, slope hydrology and water track hydrology and thermal role in the landscape. Cores were initially sampled to determine cryostratigraphic profiles of polar desert soils, in order to provide information on permafrost formation and Quaternary history. Core sampling was also often the bi-product of the installation of thermistors or the sub-sampling for isotopes. These do not include the data from the ADAPT programme, which also collected cores in the vicinity. The isotopic data was used in Paquette et al. 2018 to determine the isotopic and geochemical signature of permafrost ice, indicating when flowing water seeping from the ground was the result of permafrost degradation. ...