Stephanie Coulombe

Stephanie Coulombe
Université de Montréal | UdeM · Department of Geography

PhD

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19
Publications
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Publications

Publications (19)
Article
Full-text available
In formerly glaciated permafrost regions, extensive areas are still underlain by a considerable amount of glacier ice buried by glacigenic sediments. It is expected that large parts of glacier ice buried in the permafrost will melt in the near future, although the intensity and timing will depend on local terrain conditions and the magnitude and ra...
Article
Full-text available
Soils of circumpolar regions store large amounts of carbon (C) and are a crucial part of the global C cycle. Yet, little is known about the distribution of soil C stocks among geomorphological terrain units of glacial valleys in the Arctic. Soil C and nitrogen (N) content for the top 100 cm of the dominant vegetated geomorphological terrain units (...
Poster
Full-text available
La région Arctique est particulièrement fragilisée par les changements climatiques, où le réchauffement est deux à trois fois plus élevées qu’ailleurs sur la planète. On note une diminution massive de l’étendue et de l’épaisseur de la glace de mer, ce qui prolonge la période d’eau libre de glace et qui expose les côtes aux évènements de tempêtes pr...
Preprint
Full-text available
In formerly glaciated permafrost regions, extensive areas are still underlain by a considerable amount of glacier ice buried by glacigenic sediments. Although the extent and volume of undisturbed relict glacier ice are unknown, these ice bodies are predicted to melt with climate warming but their impact on landscape evolution remains poorly studied...
Article
Full-text available
Climate change is destabilizing permafrost landscapes, affecting infrastructure, ecosystems and human livelihoods. The rate of permafrost thaw is controlled by surface and subsurface properties and processes, all of which are potentially linked with each other. Yet, no standardized protocol exists for measuring permafrost thaw and related processes...
Article
Full-text available
Over the past decades, observations of buried glacier ice exposed in coastal bluffs and headwalls of retrogressive thaw slumps of the Arctic have indicated that considerable amounts of late Pleistocene glacier ice survived the deglaciation and are still preserved in permafrost. In exposures, relict glacier ice and intrasedimental ice often coexist...
Article
Full-text available
The Laurentide Ice Sheet (LIS) occupied a large part of North-America during the late Pleistocene. Determining the proper surface geometry and elevation of the LIS is of central importance to estimate global changes in sea-level and atmospheric circulation patterns during the late Pleistocene and Holocene. Despite largely disappearing from the land...
Article
Full-text available
Over the past decades, observations of buried glacier ice exposed in coastal bluffs and headwalls of retrogressive thaw slumps of the Arctic indicate that considerable amounts of Pleistocene glacier ice survived the deglaciation and are still preserved in permafrost. In exposures, relict glacier ice and intrasedimental ice often coexist and look al...
Presentation
Full-text available
Permafrost can contain massive ground ice of different origin. Identifying the origin and nature of massive ice is a challenge for permafrost science since the different types of massive ice remain difficult to distinguish on the sole basis of field observations. This paper uses different approaches to accurately characterize a massive ground-ice e...
Article
Full-text available
Permafrost can contain massive ground ice of different origin. Identifying the origin and nature of massive ice is a challenge for permafrost science since the different types of massive ice remain difficult to distinguish on the sole basis of field observations. This paper uses different approaches to accurately characterize a massive ground-ice e...
Poster
Full-text available
Study site: Qarlikturvik valley, Bylot Island, Nunavut 1. Georadar. We use this georadar to investigate permafrost and its structure. The good thing is we don’t have to dig or core; it’s a non-destructive tool that uses electromagnetic signal! Who knows when we could discover a buried secret? We even use it on frozen ponds to understand their morph...
Article
Full-text available
Thermo-erosion gullies in continuous permafrost regions where ice-wedge polygons are widespread contribute and change the drainage of periglacial landscapes. Gullying processes are causing long-term impacts to the Arctic landscape such as drainage network restructuring, permafrost erosion, sediment transport. Between 2009 and 2013, 35 gullies were...
Poster
Full-text available
Les changements climatiques affectent les géosystèmes périglaciaires de façon plus accentuée que partout ailleurs sur la planète. La hausse de températures de l’air sera, selon les modèles de circulation générale, plus rapide que dans les autres zones bioclimatiques extra-circumpolaires. En raison de la glace dans le sol appelée à fondre lors du dé...
Poster
Full-text available
La dégradation du pergélisol par thermo-érosion et ravinement dans un environnement de polygones à coins de glace est un phénomène géomorphologique rapide qui engendre d’importantes modifications du paysage. Les ravins de thermo-érosion changent la connectivité hydrologique au sein du bassin versant et altèrent de façon permanente les flux de matiè...
Poster
Full-text available
This poster presents some of the on-going Geocryolab’s studies on ground ice and permafrost erosion on Bylot Island, Nunavut, Canada.
Poster
Full-text available
In ice-rich permafrost areas, different genetic ground-ice types can be distinguished such as massive ice. According to the Permafrost Subcommittee (1988), massive ice typically has a gravimetric ice content of at least 250%, with a minimal thickness of 1 meter. Massive-ice exposures were found in the Qarlikturvik valley at the southwest end of Byl...
Article
Full-text available
Thermal degradation of permafrost under road infrastructure regularly results in thaw settlement and severe structural damages. The present study discusses the results obtained by the implementation of a mitigation technique at a test section along the Alaska Highway near the Alaska-Yukon border (Beaver Creek). The objective of this study was to te...
Article
Full-text available
Bylot Island is located north of Baffin Island (73°N, 80°W) and is extensively covered by an ice cap and its outlet glaciers flowing towards the arctic lowland of the Lancaster formation. During summers of 2009 and 2011 several active-layer detachment slides exposed large massive ice bodies and other types of debris-rich ice that were interpreted a...

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Project (1)
Project
This was my Ph. D. project 2009-2016 at Université de Montréal. Source : http://geocryolab.ca/ice/en/team-2/ph-d-students/etienne-godin/ Water from snowmelt runoff seeping repeatedly in open contraction cracks in ice wedges can lead to the initiation of thermo-erosion gullies. Few hundred gullies have been identified in the region of glacier C-79. My research focuses on the process of thermal erosion of ice wedges, which leads to the rapid degradation of permafrost and the impact of gullies on the local drainage in wetlands. My study site is located in the valley of glacier C-79 on Bylot Island, Canada. The objectives are to: 1) quantify the convective heat exchange between water act and permafrost; 2) characterize the geomorphology of thermo-erosion gullies from their initiation up to their stabilization; 3) determine the hydrographic changes induced by the development of thermo-erosion gullies in permafrost; 4) model the physical process of thermal erosion in different geomorphological contexts for the development of gullies. The ubiquity of ice wedges, the sensitivity of northern ecosystems and economic development in the High Arctic makes it necessary to increase knowledge about the risks to infrastructure and the environment in connection with the gully permafrost.