A5040070666- Cryospheric studies and observations
- Climate change and permafrost
- Geology and Paleoclimatology Research
- Arctic and Antarctic ice dynamics
- Smart Materials for Construction
- Tree-ring climate responses
- Atmospheric chemistry and aerosols
- Indigenous Studies and Ecology
- Animal Ecology and Behavior Studies
- Winter Sports Injuries and Performance
- Ecology and Vegetation Dynamics Studies
Université Laval
2018-2024
Makivik Corporation
2018-2024
Centre National de la Recherche Scientifique
2018-2024
Wilfrid Laurier University
2023-2024
Center for Northern Studies
2018-2024
Takuvik Joint International Laboratory
2021-2023
ABSTRACT Basal depth hoar that forms in Arctic snowpacks often has a low thermal conductivity, strongly contributing to the snowpack insulance and impacting permafrost regime. At Ward Hunt Island (Canadian high Arctic, 83°05′N, 74°07′W) almost no was observed spring 2016 despite favorable conditions. We hypothesize formation impeded by combination of two factors (1) strong winds fall formed hard dense wind slabs where water vapor transport slow (2) soil moisture led rapid ground cooling with...
Reports of fading vole and lemming population cycles persisting low populations in some parts the Arctic have raised concerns about spread these fundamental changes to tundra food web dynamics. By compiling 24 unique time series fluctuations across circumpolar region, we show that virtually all displayed alternating periods cyclic/non-cyclic over past four decades. Cyclic patterns were detected 55% ( n = 649 years pooled sites) with a median periodicity 3.7 years, non-cyclic not more...
Abstract The warming-induced growth of vegetation in the Arctic is responsible for various climate feedbacks. Snow–vegetation interactions are currently thought to increase snow-insulating capacity and thus limit soil winter cooling. Here, we focus on autumn early processes evaluate impact presence erect shrubs small trees temperature freezing. We use snow height thermal conductivity data monitored near Umiujaq, a low-Arctic site northern Quebec, Canada (56°N, 76°W), estimate insulance...
Abstract. Seasonal snow covers Arctic lands 6 to 10 months of the year and is therefore an essential element geosphere biosphere. Yet, even most sophisticated physics models are not able simulate fundamental physical properties snowpacks such as density, thermal conductivity specific surface area. The development improved in progress, but testing requires detailed driving validation data for high herb tundra sites, which presently available. We present years ice-wedge polygonal site Canadian...
Abstract Erect shrubs in the Arctic reduce surface albedo when branches protrude above snow and modify properties, particular specific area (SSA). Important consequences are changes land surface–atmosphere energy exchange increase of melting autumn, possibly inducing reduced soil thermal insulation turn permafrost cooling. Near Umiujaq (56.5°N, 76.5°W) Canadian low where dwarf birches ( Betula glandulosa ) expanding, spectral (400–1080 nm) under diffuse light vertical profiles SSA were...
Abstract. As the vegetation in Arctic changes, tundra ecosystems along southern border of are becoming greener and gradually giving way to boreal ecosystems. This change is affecting local populations, wildlife, energy exchange processes between environmental compartments, carbon cycle. To understand progression implications this vegetation, satellite measurements surface models can be employed. However, situ observational data required validate these models. paper presents from two nearby...
Abstract Arctic shrubs reduce surface albedo in winter when branches protrude above the snow. To calculate of those mixed surfaces, branch area index (BAI) needs to be known. Moreover, an exposed-vegetation function is required determine BAI for protruding only. This study used a structural analysis 30 Betula glandulosa shrubs, sampled near Umiujaq, northern Quebec, (i) establish allometric relationship between shrub height and (ii) specific shrubs. The spectral (400–1080 nm) surfaces was...
Abstract. The warming-induced expansion of shrubs in the Arctic is transforming snowpacks into a mixture snow, impurities and buried branches. Because snow translucent medium which light penetrates up to tens centimetres, branches may alter snowpack radiation budget with important consequences for thermal regime microstructure. To characterize influence on radiative transfer irradiance profiles were measured without near Umiujaq Canadian Low (56.5∘ N, 76.5∘ W) November December 2015. Using...
Abstract. Seasonal snow covers Arctic lands 6 to 10 months of the year and is therefore an essential element geosphere biosphere. Yet, even most sophisticated physics models are not able simulate fundamental physical properties snowpacks such as density, thermal conductivity specific surface area. The development improved in progress but testing requires detailed driving validation data for high herb tundra sites, which presently available. We present years ice-wedge polygonal site Canadian...
Abstract. The warming-induced expansion of shrubs in the Arctic is transforming snowpacks into a mixture snow, impurities and buried branches. Because snow translucent medium which light penetrates up to tens centimeters, branches may alter snowpack radiation budget with important consequences for thermal regime microstructure. To characterize influence on radiative transfer irradiance profiles were measured without near Umiujaq Canadian Low (56.5° N, 76.5° W) November December 2015. Using...
Abstract. As the vegetation in Arctic changes, tundra ecosystems along southern border of are becoming greener and gradually giving way to boreal ecosystems. This change is affecting local populations, wildlife, energy exchange processes between environmental compartments, carbon cycle. To understand progression implications this vegetation, satellite measurements surface models can be employed. However, situ observational data required validate these models. paper presents from two nearby...
<p>With climate warming shrubs can grow on high-Arctic tundra. This impacts many terms of the energy budget, resulting in a modification permafrost thermal regime. The summer surface albedo is decreased. winter decreased because protrude above snow. Winter conductive fluxes through snow are reduced trap snow, increasing depth. Shrubs also favor both melt fall and spring depth hoar formation winter, these factors affect conductivity. Soil properties may be affected increased...