Alexandre Langlois

Chercheurs•[email protected]•819-821-8000, poste 65690

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Chercheurs

Résumé

Le Prof. Langlois est expert dans le domaine de la télédétection et de l’étude de la cryosphère. Professeur à l’Université de Sherbrooke, il est le co-fondateur du Groupe de Recherche Interdisciplinaire sur les Milieux Polaires (GRIMP) et occupe actuellement la direction du Centre d’Applications et de Recherches en Télédétection (CARTEL). Ses travaux portent sur le développement d’outils de télédétection et de modélisation pour l’étude de la neige, du pergélisol, de la glace et de la végétation dans les environnements arctiques et alpins. Il a publié plus de 79 articles évalués par les pairs et présenté 115 communications scientifiques, dont une vingtaine à titre d’invité. Depuis 2012, il a obtenu plus de 12 M$ en financement de recherche, dont plus de 10 M$ comme chercheur principal. Son rôle de coordination inclut notamment la direction du consortium académique canadien de la mission satellitaire Terrestrial Snow Mass Mission (TSMM), réunissant 14 institutions.

Depuis 2013, il a supervisé ou co-supervisé 53 étudiants et stagiaires postdoctoraux (33 maîtrises, 17 doctorats et 3 postdoctorats).

Son engagement dans la communauté scientifique comprend également l’organisation d’événements (p. ex. président de l’Eastern Snow Conference en 2016, président scientifique de l’Expo-Science en 2015, et responsable du GIS Day en 2024), ainsi que divers rôles au sein de comités et associations. Il a reçu la Médaille de bronze de la Société canadienne de télédétection en 2017 et le Prix institutionnel d’excellence dans l’encadrement des études supérieures de l’Université de Sherbrooke en 2024.

Thème de recherche

Télédétection du couvert nival arctique
Effets des changements climatiques sur les écosystèmes nordiques
Suivi des évènements extrêmes hivernaux dans l’Arctique

Étudiants / Chercheurs postdoctoraux

William Durand (Maîtrise)
Erika Boisvert-Vigneault (Maîtrise)
Elise Groulx-Maurer (Maîtrise)
Antoine Rolland (Maîtrise)
Charlotte Crevier (Maîtrise)
Joëlle Voglimacci-Stéphanopoli (Doctorat)
Francis Meloche (Doctorat)
Estéban Hamel Jomphe (Doctorat)
Paul Billecocq (Doctorat)
Vincent Sasseville (Doctorat)
Daniel Kramer (Doctorat / Professionnel)
Jean Benoit Madore (Doctorat)
Julien Meloche (Post-Doctorat)
Caroline Dolant (Post-Doctorat)

Anciens étudiants

Coralie Gauthier (Maîtrise)
Alex Blanchette (Maîtrise)
Guillaume Couture (Maîtrise)
Jacob Laliberté (Maîtrise)
Simon Levasseur (Maîtrise)
Chloé Martineau (Maîtrise)
Caroline Dolant (Doctorat)
Julien Méloche (Doctorat)
Alexandre Mavrovic (Maîtrise / Co-direction)
Olivier Saint Jean Rondeau (Maîtrise / Co-direction)
Michael Prince (Maîtrise / Co-direction)
Bruno-Charles Busseau (Maîtrise / Co-direction)
Charles Papasodoro (Maîtrise / Co-direction)
Nathalie Thériault (Maîtrise / Co-direction)
Félix Ouellet (Maîtrise)
Kevin Côté (Maîtrise)
Jean-Benoit Madore (Maîtrise)

Publications du chercheur

2626991 Langlois 1 universite-de-sherbrooke-departement-de-geomatique 50 date desc Langlois 470 https://grimp.ca/wp-content/plugins/zotpress/

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Gélinas, A., Filali, B., Langlois, A., Kelly, R., Mavrovic, A., Demontoux, F. et Roy, A. (2025) New Wideband Large Aperture Open-Ended Coaxial Microwave Probe for Soil Dielectric Characterization. IEEE Transactions on Geoscience and Remote Sensing, vol. 63, p. 1‑8.

Meloche, F., Guillet, L., Gauthier, F., Langlois, A. et Gaume, J. (2025) Influence of slab depth spatial variability on skier-triggering probability and avalanche size. Annals of Glaciology, vol. 65, p. e13.

Meloche, F., Gauthier, F. et Langlois, A. (2024) Snow mechanical property variability at the slope scale – implication for snow mechanical modelling. The Cryosphere, vol. 18, n°3, p. 1359‑1380.

Sasseville, V., Langlois, A., Brucker, L. et Johnson, C. A. (2024) Patterns and Trend Analysis of Rain-on-Snow Events using Passive Microwave Satellite Data over the Canadian Arctic Archipelago Since 1987. Journal of Hydrometeorology, vol. 25, n°2, p. 311‑324.

Meloche, J., Royer, A., Roy, A., Langlois, A. et Picard, G. (2024) Improvement of Polar Snow Microwave Brightness Temperature Simulations for Dense Wind Slab and Large Grain. IEEE Transactions on Geoscience and Remote Sensing, vol. 62, p. 1‑10.

Billecocq, P., Langlois, A. et Montpetit, B. (2023) Subgridding high-resolution numerical weather forecast in the Canadian Selkirk mountain range for local snow modeling in a remote sensing perspective. Snow/Mountain Processes.

Kramer, D., Langlois, A., Royer, A., Madore, J.-B., King, J., McLennan, D. et Boisvert-Vigneault, É. (2023) Assessment of Arctic snow stratigraphy and water equivalent using a portable Frequency Modulated Continuous Wave RADAR. Cold Regions Science and Technology, vol. 205, p. 103683.

Meloche, J., Langlois, A., Rutter, N., McLennan, D., Royer, A., Billecocq, P. et Ponomarenko, S. (2022) High‐resolution snow depth prediction using Random Forest algorithm with topographic parameters: A case study in the Greiner watershed, Nunavut. Hydrological Processes, vol. 36, n°3.

Madore, J.-B., Fierz, C. et Langlois, A. (2022) Investigation into percolation and liquid water content in a multi-layered snow model for wet snow instabilities in Glacier National Park, Canada. Frontiers in Earth Science, vol. 10, p. 898980.

Laliberté, J., Langlois, A., Royer, a, Madore, J.-B. et Gauthier, F. (2022) Retrieving dry snow stratigraphy using a versatile low-cost frequency modulated continuous wave (FMCW) K-band radar. Physical Geography, vol. 43, n°3, p. 308‑332.

Gautier, C., Langlois, A., Sasseville, V., Neave, E. et Johnson, C. A. (2022) Remote sensing, snow modelling, survey data and Indigenous Knowledge show how snow and sea-ice conditions affect Peary caribou (Rangifer tarandus pearyi) distribution and inter-island and island–mainland movements. Polar Research, vol. 41.

Voglimacci-Stephanopoli, J., Wendleder, A., Lantuit, H., Langlois, A., Stettner, S., Schmitt, A., Dedieu, J.-P., Roth, A. et Royer, A. (2022) Potential of X-band polarimetric synthetic aperture radar co-polar phase difference for arctic snow depth estimation. The Cryosphere, vol. 16, n°6, p. 2163‑2181.

Martineau, C., Langlois, A., Gouttevin, I., Neave, E. et Johnson, C. A. (2022) Improving Peary Caribou Presence Predictions in MaxEnt Using Spatialized Snow Simulations. ARCTIC, vol. 75, n°1, p. 55‑71.

Meloche, J., Langlois, A., Rutter, N., Royer, A., King, J., Walker, B., Marsh, P. et Wilcox, E. J. (2022) Characterizing tundra snow sub-pixel variability to improve brightness temperature estimation in satellite SWE retrievals. The Cryosphere, vol. 16, n°1, p. 87‑101.

Royer, A., Roy, A., Jutras, S. et Langlois, A. (2021) Review article: Performance assessment of radiation-based field sensors for monitoring the water equivalent of snow cover (SWE). The Cryosphere, vol. 15, n°11, p. 5079‑5098.

Royer, A., Domine, F., Roy, A., Langlois, A., Marchand, N. et Davesne, G. (2021) New northern snowpack classification linked to vegetation cover on a latitudinal mega-transect across northeastern Canada. Écoscience, vol. 28, n°3‑4, p. 225‑242.

Levasseur, S., Brown, K., Langlois, A. et McLennan, D. (2021) Measurement of Snow Physical Properties and Stable Isotope Variations in the Canadian Sub-Arctic and Arctic Snowpack. Atmosphere-Ocean, vol. 59, n°3, p. 137‑151.

Meloche, J., Royer, A., Langlois, A., Rutter, N. et Sasseville, V. (2021) Improvement of microwave emissivity parameterization of frozen Arctic soils using roughness measurements derived from photogrammetry. International Journal of Digital Earth, vol. 14, n°10, p. 1380‑1396.

Royer, A., Picard, G., Vargel, C., Langlois, A., Gouttevin, I. et Dumont, M. (2021) Improved Simulation of Arctic Circumpolar Land Area Snow Properties and Soil Temperatures. Frontiers in Earth Science, vol. 9, p. 685140.

Letcher, T., Vuyovich, C., Langlois, A. et Roy, A. (2021) Understanding Uncertainty of Snow Radiative Transfer Modeling Within a Mixed Deciduous and Evergreen Forest. IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing, vol. 14, p. 8225‑8235.

Holtzman, N. M., Anderegg, L. D. L., Kraatz, S., Mavrovic, A., Sonnentag, O., Pappas, C., Cosh, M. H., Langlois, A., Lakhankar, T., Tesser, D., Steiner, N., Colliander, A., Roy, A. et Konings, A. G. (2021) L-band vegetation optical depth as an indicator of plant water potential in a temperate deciduous forest stand. Biogeosciences, vol. 18, n°2, p. 739‑753.

Vargel, C., Royer, A., St-Jean-Rondeau, O., Picard, G., Roy, A., Sasseville, V. et Langlois, A. (2020) Arctic and subarctic snow microstructure analysis for microwave brightness temperature simulations. Remote Sensing of Environment, vol. 242, p. 111754.

Roy, A., Toose, P., Mavrovic, A., Pappas, C., Royer, A., Derksen, C., Berg, A., Rowlandson, T., El-Amine, M., Barr, A., Black, A., Langlois, A. et Sonnentag, O. (2020) L-Band response to freeze/thaw in a boreal forest stand from ground- and tower-based radiometer observations. Remote Sensing of Environment, vol. 237, p. 111542.

Mavrovic, A., Madore, J.-B., Langlois, A., Royer, A. et Roy, A. (2020) Snow liquid water content measurement using an open-ended coaxial probe (OECP). Cold Regions Science and Technology, vol. 171, p. 102958.

Langlois, A., Royer, A., Montpetit, B., Roy, A. et Durocher, M. (2020) Presenting Snow Grain Size and Shape Distributions in Northern Canada Using a New Photographic Device Allowing 2D and 3D Representation of Snow Grains. Frontiers in Earth Science, vol. 7, p. 347.

Pomerleau, P., Royer, A., Langlois, A., Cliche, P., Courtemanche, B., Madore, J.-B., Picard, G. et Lefebvre, É. (2020) Low Cost and Compact FMCW 24 GHz Radar Applications for Snowpack and Ice Thickness Measurements. Sensors, vol. 20, n°14, p. 3909.

Meloche, J., Royer, A., Langlois, A., Rutter, N. et Sasseville, V. (2020) Passive microwave emission of frozen tundra soils using roughness measurements derived from photogrammetry. International Journal of Digital Earth, n°2020‑ 0130.

Kaluskar, S., Blukacz‐Richards, E. A., Johnson, C. A., He, Y., Langlois, A., Kim, D. et Arhonditsis, G. (2019) Development of a model ensemble to predict Peary caribou populations in the Canadian Arctic Archipelago. Ecosphere, vol. 10, n°12.

Prince, M., Roy, A., Royer, A. et Langlois, A. (2019) Timing and spatial variability of fall soil freezing in boreal forest and its effect on SMAP L-band radiometer measurements. Remote Sensing of Environment, vol. 231, p. 111230.

Domine, F., Picard, G., Morin, S., Barrere, M., Madore, J.-B. et Langlois, A. (2019) Major Issues in Simulating Some Arctic Snowpack Properties Using Current Detailed Snow Physics Models: Consequences for the Thermal Regime and Water Budget of Permafrost. Journal of Advances in Modeling Earth Systems, vol. 11, n°1, p. 34‑44.

Kramer, D., Meloche, J., Langlois, A., McLennan, D., Chapdelaine, B., Gauthier Barrette, C., Royer, A. et Cliche, P. (2019) Designing a Do-It-Yourself Unmanned aerial Vehicle for Arctic research purposes and proving its capabilities by retrieving snow depth via structure-from-motion. Aqhaliat 2019, Polar Knowledge Canada, p. 43‑62.

King, J., Derksen, C., Toose, P., Langlois, A., Larsen, C., Lemmetyinen, J., Marsh, P., Montpetit, B., Roy, A., Rutter, N. et Sturm, M. (2018) The influence of snow microstructure on dual-frequency radar measurements in a tundra environment. Remote Sensing of Environment, vol. 215, p. 242‑254.

Montpetit, B., Royer, A., Roy, A. et Langlois, A. (2018) In-situ passive microwave emission model parameterization of sub-arctic frozen organic soils. Remote Sensing of Environment, vol. 205, p. 112‑118.

Lyu, H., McColl, K. A., Li, X., Derksen, C., Berg, A., Black, T. A., Euskirchen, E., Loranty, M., Pulliainen, J., Rautiainen, K., Rowlandson, T., Roy, A., Royer, A., Langlois, A., Stephens, J., Lu, H. et Entekhabi, D. (2018) Validation of the SMAP freeze/thaw product using categorical triple collocation. Remote Sensing of Environment, vol. 205, p. 329‑337.

Marchand, N., Royer, A., Krinner, G., Roy, A., Langlois, A. et Vargel, C. (2018) Snow-Covered Soil Temperature Retrieval in Canadian Arctic Permafrost Areas, Using a Land Surface Scheme Informed with Satellite Remote Sensing Data. Remote Sensing, vol. 10, n°11, p. 1703.

Dolant, C., Langlois, A., Brucker, L., Royer, A., Roy, A. et Montpetit, B. (2018) Meteorological inventory of rain-on-snow events in the Canadian Arctic Archipelago and satellite detection assessment using passive microwave data. Physical Geography, vol. 39, n°5, p. 428‑444.

Madore, J.-B., Langlois, A. et Côté, K. (2018) Evaluation of the SNOWPACK model’s metamorphism and microstructure in Canada: a case study. Physical Geography, vol. 39, n°5, p. 406‑427.

Dolant, C., Montpetit, B., Langlois, A., Brucker, L., Zolina, O., Johnson, C. A., Royer, A. et Smith, P. (2018) Assessment of the Barren Ground Caribou Die‐off During Winter 2015–2016 Using Passive Microwave Observations. Geophysical Research Letters, vol. 45, n°10, p. 4908‑4916.

Larue, F., Royer, A., De Sève, D., Langlois, A., Roy, A. et Brucker, L. (2017) Validation of GlobSnow-2 snow water equivalent over Eastern Canada. Remote Sensing of Environment, vol. 194, p. 264‑277.

Derksen, C., Xu, X., Scott Dunbar, R., Colliander, A., Kim, Y., Kimball, J. S., Black, T. A., Euskirchen, E., Langlois, A., Loranty, M. M., Marsh, P., Rautiainen, K., Roy, A., Royer, A. et Stephens, J. (2017) Retrieving landscape freeze/thaw state from Soil Moisture Active Passive (SMAP) radar and radiometer measurements. Remote Sensing of Environment, vol. 194, p. 48‑62.

Royer, A., Roy, A., Montpetit, B., Saint-Jean-Rondeau, O., Picard, G., Brucker, L. et Langlois, A. (2017) Comparison of commonly-used microwave radiative transfer models for snow remote sensing. Remote Sensing of Environment, vol. 190, p. 247‑259.

Langlois, A., Johnson, C.-A., Montpetit, B., Royer, A., Blukacz-Richards, E. A., Neave, E., Dolant, C., Roy, A., Arhonditsis, G., Kim, D.-K., Kaluskar, S. et Brucker, L. (2017) Detection of rain-on-snow (ROS) events and ice layer formation using passive microwave radiometry: A context for Peary caribou habitat in the Canadian Arctic. Remote Sensing of Environment, vol. 189, p. 84‑95.

Côté, K., Madore, J.-B. et Langlois, A. (2017) Uncertainties in the SNOWPACK multilayer snow model for a Canadian avalanche context: sensitivity to climatic forcing data. Physical Geography, vol. 38, n°2, p. 124‑142.

Ouellet, F., Langlois, A., Blukacz-Richards, E. A., Johnson, C. A., Royer, A., Neave, E. et Larter, N. C. (2017) Spatialization of the SNOWPACK snow model for the Canadian Arctic to assess Peary caribou winter grazing conditions. Physical Geography, vol. 38, n°2, p. 143‑158.

Busseau, B.-C., Royer, A., Roy, A., Langlois, A. et Domine, F. (2017) Analysis of snow-vegetation interactions in the low Arctic-Subarctic transition zone (northeastern Canada). Physical Geography, vol. 38, n°2, p. 159‑175.

Papasodoro, C., Royer, A., Langlois, A. et Berthier, E. (2016) Potential of RADARSAT-2 stereo radargrammetry for the generation of glacier DEMs. Journal of Glaciology, vol. 62, n°233, p. 486‑496.

Roy, A., Royer, A., St-Jean-Rondeau, O., Montpetit, B., Picard, G., Mavrovic, A., Marchand, N. et Langlois, A. (2016) Microwave snow emission modeling uncertainties in boreal and subarctic environments. The Cryosphere, vol. 10, n°2, p. 623‑638.

Dolant, C., Langlois, A., Montpetit, B., Brucker, L., Roy, A. et Royer, A. (2016) Development of a rain-on-snow detection algorithm using passive microwave radiometry: Snow; Passive Microwave; Rain-on-snow; Extreme Winter Events. Hydrological Processes, vol. 30, n°18, p. 3184‑3196.

Roy, A., Royer, A., Derksen, C., Brucker, L., Langlois, A., Mialon, A. et Kerr, Y. H. (2015) Evaluation of Spaceborne L-Band Radiometer Measurements for Terrestrial Freeze/Thaw Retrievals in Canada. IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing, vol. 8, n°9, p. 4442‑4459.