Icings near the Tibbitt to Contwoyto Winter Road, Great Slave Uplands, Northwest Territories

Abstract

This thesis could not have been accomplished without the support of a myriad of individuals. First my supervisor, Chris Burn, for meeting with me regularly, keeping me on track, and helping me see that I have something to say. Meetings that never felt timeconstrained and often included a cup of tea and a couple of chocolate-covered digestives were deeply appreciated. My colleagues at the Geological Survey of Canada (GSC) were instrumental. My colleague and committee member, Stephen Wolfe, supported this endeavour from its earliest beginnings right through to the end. His enthusiasm for the topic and questions to make me think kept this project alive. My immediate colleagues (in alphabetical order),

Evaluating the impact of snow fencing on snow conditions and ground temperatures along the Dempster Highway, Yukon, Canada

“…Where Ta, Ts, and to 4 June 2019. The freezing season, FS, marked by solid black vertical lines, denotes the period from the first day of autumn when the daily mean air temperature fell and remained below 0 °C for three consecutive days, to the first day in spring when the daily mean air temperature rose and remained above 0 °C for three consecutive days (Sladen 2017). March 2018-19, respectively.…”

“…Daily mean air temperatures (Ta) from the Rock River weather station were used to determine the start and end of the air freezing season (FSa). The FSa began the first day of autumn when Ta fell and remained below 0 °C for three consecutive days (unless it was followed by a warming period of equal or greater length, in which case the freezing season would restart) and ended on the last day in spring with three or more days with Ta above 0 °C (Sladen 2017). Similarly, the ground freezing season (FS10) began when the daily mean ground surface temperature (T10) fell below 0 °C unless it was directly followed by a warming period of equal or greater length, in which case the freezing season would restart.…”

“…The study period, indicated by dashed vertical lines, denotes the period in which ground temperatures were recorded, 27 August 2018 to 4 June 2019. The freezing season, FS, marked by solid black vertical lines, denotes the period from the first day of autumn when the daily mean air temperature fell and remained below 0 °C for three consecutive days, to the first day in spring when the daily mean air temperature rose and remained above 0 °C for three consecutive days (Sladen 2017). Thawing events, marked by black circles, indicate when daily mean air temperature exceeded 0 °C after the freezing season had begun.…”