Mes domaines d’étude sont principalement la géophysique et la télédétection pour le suivi des risques naturels dans un environnement de changement. Je me concentre principalement sur les régions polaires où mes études tentent d’établir les liens complexes entre l’activité humaine, les changements climatiques et les risques naturels qui y sont associés. Je tente de voir l’évolution de ces risques à long terme à l’aide de modèles en intégrant des mesures terrain.

• Formation
• Domaines d’enseignement
• Recherches actuelles
• Publications récentes

• Postdoctorat (géographie physique et télédétection), Université de Sherbrooke, Québec, Canada (2010)
• Ph. D. (géophysique), University of Manitoba, Canada (2007)
• M. Sc. (télédétection), Université de Sherbrooke, Québec, Canada (2003)
• B. Sc. (géographie physique et télédétection), Université de Sherbrooke, Québec, Canada (2001)

• Télédétection optique et radar
• Géomatique et géorisques
• Géomatique et changements climatiques
• La neige

• Les effets des changements climatiques sur le pergélisol, le couvert nival et la toundra, lacs et rivières et géosystèmes dans le but de trouver des solutions et stratégies d’adaptation pour les communautés nordiques.
• La quantification des incertitudes relatives à la détermination de l’équivalent en eau de la neige liées à la végétation et la topographie, et l’exploration du besoin de mesures en continu et en temps réel.
• La promotion et le développement des méthodes innovatrices de mesures du manteau neigeux.

• Holtzman, N., Anderegg, L.D.L., Kraatz, S., Mavrovic, A., Sonnentag, O., Pappas, C., Cosh, M., Langlois, A., Lakhankar, T., Tesser, D., Steiner, N., Colliander, A., Roy, A., Konings, A.G. (2020) L-band vegetation optical depth as an indicator of plant water potential in a temperate deciduous forest stand. Biogeosciences, submitted, bg-2020-373.
• Meloche, J., Royer, A., Langlois, A., Rutter, N. and Sasseville, V. (2020) Passive microwave emission of frozen tundra soils using roughness measurements derived from photogrammetry. International Journal of Digital Earth, Submitted, TJDE-2020-0130.
• Martineau, C., Langlois, A., Johnson, C.-A., Gouttevin, I. and Neave, E. (2019) Improving Peary caribou presence prediction from the MaxEnt model using spatialized snow simulations: a case study over Bathurst Island Complex, Nunavut, Canada. Arctic, Submitted, June 2020.
• Pomerleau P., Royer, A., Langlois, A., Cliche, P., Courtemanche, B., Madore, J.-B., Picard, G. and Lefebvre, E. (2020) Low cost and compact FMCW 24-GHz radar for snowpack and ice thickness measurements. Sensors, 20(14), doi.org/10.3390/s20143909.
• Vargel V., A. Royer, O. St-Jean-Rondeau, G. Picard, A. Roy, V. Sasseville and A. Langlois (2020) Arctic and Subarctic snow microstructure analysis for microwave brightness temperature simulations. Remote Sensing of Environment, 242, 111754.
• Mavrovic A., J.-B. Madore, A. Langlois, A. Royer, A. Roy (2020). Snow liquid water content measurement using an open-ended coaxial probe (OECP). Cold Regions Science and Technology, 171, 102958
• Langlois, A., A. Royer, B. Montpetit, A. Roy and M. Durocher (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 Earth Science, 7:347.
• Roy, A., P. Toose, A. Mavrovic, C. Pappas, A. Royer, C. Derksen, A. Berg, T. Rowlandson, M. El-Amine, W. Helgason, A. Barr, A. Black, A. Langlois and O. Sonnentag (2020) L-Band response to freeze/thaw in a boreal forest stand from ground and tower-based radiometer observations. Remote Sensing of Environment, 237, 111542.
• Levasseur, S., Brown, K., Langlois, A. and McLennan, D. 2020. Measurement of physical properties and stable isotope composition of snow. Atmosphere-Ocean, AO-2020-0027, Submitted.
• Kaluskar, S., Blukacz-Richards, A., Johnson, C.-A., He, Y., Langlois, A., Kim, D.-K. and Arhonditsis, G. 2019. Development of a model ensemble to predict Peary caribou populations in the Canadian Arctic Archipelago. Ecosphere, doi.org/10.1002/ecs2.2976.
• Vargel, C., A. Royer, O. St-Jean rondeau, G. Picard, A. Roy, V. Sasseville and A. Langlois (2019) Arctic and Subarctic snow microstructure analysis for microwave brightness temperature simulations. Remote Sensing of Environment, submitted, RSE-D-19-01117.
• Samarth Kaluskar, Agnes Blukacz-Richards, Cheryl-Ann Johnson, Yuhong He, Alexandre Langlois, Dong-Kyun Kim, George Arhonditsis, 2019. Development of a model ensemble to predict Peary caribou populations in the Canadian Arctic Archipelago. Ecosphere, ECS19-0517.
• Domine, F., G. Picard, S. Morin, M. Barrere, J.-B. Madore and A. Langlois (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, 34-44.
• Kramer, D., Meloche, J., Langlois, A., McLennan, D., Gauthier-Barrette, C., Royer, A. and Cliche, P. 2019. Designing a DIY-UAV for arctic research purposes and proving its capabilities by retrieving snow depth via structure-from-motion, Polar Knowledge : Aqhaliat 2019, Polar Knowledge Canada, In Press, May 2019.
• Prince, M., A. Roy, A. Royer and A. Langlois (2018) Timing and Spatial Variability of Fall Soil Freezing in Boreal Forest and its Effect on SMAP L-band Radiometer Measurements. Remote Sensing of Environment, 231.
• King, J., C. Derksen, P. Toose, A. Langlois, C. Larsen, J. Lemmetyinen, P. Marsh, B. Montpetit, A. Roy, N. Rutter and M. Sturm (2018) The influence of snow microstructure on dual-frequency radar measurements in a tundra environment. Remote Sensing of Environment, 215 : 242-254.
• Lyu, H., K.A. McColl, X. Li, C. Deriksen, A. Berg, T.A. Black, E. Euskirchen, M. Loranty, J. Pulliainen, K. Rautiainen, T. Rowlandson, A. Roy, A. Royer, A. Langlois, J. Stephens, H. Liu and D. Entekhabi (2018) Validation of the SMAP freeze/thaw product using categorical triple collocation. Remote sensing of Environment, 205 : 329-337.
• Dolant, C., A. Langlois, L. Brucker, A. Royer, A.R. Roy, B. Montpetit (2018) Meteorological inventory of rain-on-snow events in the Canadian Arctic Archipelago and satellite detection assessment using passive microwave data. Physical Geography, 39(5): 428-444.
• Dolant, C., B. Montpetit, A. Langlois, L. Brucker, O. Zolina, C.A. Johnson, A. Royer and P. Smith (2018) Assessment of the Barren Ground Caribou Die-off During Winter 2015–2016 Using Passive Microwave Observations. Geophysical Research Letters, 4908-4916.
• Madore, J.-B., A. Langlois and K. Côté (2018) Evaluation of the SNOWPACK model's metamorphism and microstructure in Canada : a case study. Physical Geography, 39:5, 406-427.
• Marchand, N., A. Royer, A., G. Krinner, A. Roy. A. Langlois and C. Vargel (2018) Snow-Covered Soil Temperature Retrieval in Canadian Arctic Permafrost Areas, Using a Land Surface Scheme Informed with Satellite Remote Sensing Data. Remote Sensing, 10(11), 1703.
• Montpetit, B., Royer, A., Roy, A.R., Langlois, A. (2018) In-situ passive microwave emission model parameter ization of sub-arctic frozen organic soils. Remote Sensing of Environment, 205: 112-118.
• Busseau, B.-C., Royer, A., Langlois, A., Barrère, M. And Domine, F. (2017) Analysis of snow-vegetation interactions in the low Arctic – Subarctic transition zone (North Eastern Canada). Physical Geography, 38:2, 159-175.
• Derksen, C.,  X. Xu, R. Scott Dunbar, A. Colliander, Y. Kim, J. Kimball, A. Black, E. Euskirchen, A. Langlois, M. Loranty, P. Marsh, K. Rautiainen, A. Roy and A. Royer (2017). Retrieving landscape freeze/thaw state from Soil Moisture Active Passive (SMAP) radar and radiometer measurements. Remote Sensing of Environment, 194 : 48-62.
• Côté, K., Madore, J.-B., and Langlois, A. (2017). Uncertainties in the SNOWPACK multilayer snow model for a Canadian avalanche context: sensitivity to climatic forcing data. Physical Geography, 38:2, 124-142.
• Dolant, C., Langlois, A., Brucker, L., Royer, A., Roy, A. and Montpetit, B. (2017). Meteorological inventory of rain-on-snow events in the Canadian Arctic Archipelago and satellite detection assessment using passive microwave data. Physical Geography (online).
• Larue F., A. Royer, D. De Sève, A. Langlois, A. Roy and L. Brucker (2017). Validation of GlobSnow-2 snow water equivalent over Eastern Canada. Remote Sensing of Environment, 194 : 264-277.
• Langlois, A., C.-A. Johnson, B. Montpetit, A. Royer, E.A. Blukacz-Richards, E. Neave, C. Dolant, A. Roy, G. Arhonditsis, D.-K. Kime, S. Kaluskar, L. Brucker (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, 189 : 84-95.
• Royer A., A. Roy, B. Montpetit, O. Saint-Jean-Rondeau, G. Picard, L. Brucker, and A. Langlois (2017). Comparison of commonly-used microwave radiative transfer models for snow remote sensing. Remote Sensing of Environment, 190 : 247-259.
• Ouellet, F., Langlois, A., Johnson, C.-A., Richards, A. and Royer, A. (2017). Spatialization of the SNOWPACK Snow Model in the Canadian Arctic for Peary Caribou Winter Grazing conditions Assessment. Physical Geography, 38:2, 143-158.
• Dolant, C., Langlois, A., Montpetit, B., Brucker, L., Roy, A., and Royer, A. (2016) Development of a rain-on-snow detection algorithm using passive microwave radiometry. Hydrological Processes. 30, 18 : 3184–3196
• Papasodoro, C., Royer, A., Langlois, A., Berthier, É. (2016) Potential of RADARSAT-2 stereo radargrammetry for the generation of glacier DEMs. Journal of Glaciology, 62(233): 486-496.
• Roy, A., Royer, A., St-Jean-Rondeau, O., Montpetit, B., Picard, G., Marchand, N., and Langlois, A. (2016) Microwave snow emission modeling uncertainties in boreal and subarctic environments. The Cryosphere, 10 : 623-638.
• Papasodoro, C., Berthier, E., Royer, A., Zdanowic z, C. And Langlois, A. (2015) Area, elevation and mass changes of the two southernmost ice caps of the Canadian Arctic Archipelagobetween 1952 and 2014. The Cryosphere, 9 : 1535-1550.
• Roy A. Royer A., Derksen, C., Brucker, L., Langlois, A., Mialond, A., and Kerr, Y. (2015) Evaluation of Spaceborne L-band Radiometer Measurements for Terrestrial Freeze/Thaw Retrievals in Canada. IEEE selected topics in applied earth observations and remote sensing, 8(9) : 4442-4459.
• Dupont, F., Picard, G., Royer, A., Fily, M., Roy, A., Langlois, A. and Champollion, N. (2014). Modeling the microwave emission of bubbly ice: Applications to blue ice and superimposed ice in the Antarctic and Arctic. IEEE Transactions on Geoscience and Remote Sensing, 52(10), 6639-6651, Oct. 2014 doi: 10.1109/TGRS.2014.2299829
• Langlois, A., Bergeron, J., Brown, R., Royer, A., Harvey, R., Roy, A., Wang, L. and Thériault, N. (2014) Evaluation of CLASS 2.7 and 3.5 simulations of snow properties from the Canadian Regional Climate Model (CRCM4) over Québec, Canada. J. of Hydrometeorology.
• Rutter, N., M. Sandells, C. Derksen, P. Toose, A. Royer, B. Montpetit, A. Langlois, J. Lemmetyinen, and J. Pulliainen (2014). Snow stratigraphic heterogeneity within ground-based passive microwave radiometer footprints : Implications for emission modeling. J. Geophys. Res. Earth Surf., 119.
• Wang, L., MacKay, M., Brown, R., Bartlett, P., Harvey, R., Langlois, A. (2014) Application of satellite data for evaluating the cold climate performance of the Canadian Regional Climate Model over Québec, Canada. Journal of Hydrometeorology, 15(2): 614–630.
• Roy, A.R., Picard, G., Royer, A., Montpetit, B., Dupont, F., Langlois, A., Derksen, C., Champollion, N., 2013. Brightness temperature simulations of the Canadian seasonal snowpack driven by measurements of the snow specific surface area. IEEE Transactions on Geoscience and Remote Sensing, 51(9): 4692-4704.
• Roy, A.R., Royer, A., Montpetit, B., Bartlett, P.A., Langlois, A., 2013. Snow specific surface area simulation using the one-layer snow model in the Canadian LAnd Surface Scheme (CLASS). The Cryosphere, 7: 961-975.
• Derksen, C., Smith, S.L., Sharp, M., Brown, L., Howell, S., Copland, L., Mueller, D.R., Gauthier, Y., Fletcher, C., Tivy, A., Bernier, M., Bourgeois, J., Brown, R., Burn, C., Duguay, C., Kushner, P., Langlois, A., Lewkowicz, A., Royer, A., Walker, A., 2012. Variability and change in the canadian cryosphere. Climatic Change, 115(1): 59-88.
• Roy, A., Royer, A., Montpetit, B., Bartlett, P.A., and Langlois, A. (2013)  Snow specific surface area simulation using the one-layer snow model in the Canadian LAnd Surface Scheme (CLASS). The Cryosphere, 7, 961-975.
• Langlois, A., Royer, A., Derksen, C., Montpetit, B., Dupont, F., Goïta, K. (2012) Coupling the snow thermodynamic model SNOWPACK with the microwave emission model of layered snowpacks for subarctic and arctic snow water equivalent retrievals. Water Resources Research, vol. 48, W12524, December 2012.
• Derksen, C., Smith, S. L., Sharp, M., Brown, L., Howell, S., Copland, L., Muelle, D. R., Gauthier, Y., Fletcher, C., Tivy, A., Bernier, M., Bourgeois, J., Brown, R., Burn, C. R., Duguay, C., Kushner, P., Langlois, A., Lewkowicz, A. G., Royer, A. and Walker, A. (2012) Varianility and change in the canadian cryosphere, Climatic Change.
• Derksen, C., Toose, P., Lemmetyinen, J., Pulliainen, J., Langlois, A., Rutter, N. and Fuller, M.C. (2012) Evaluation of passive microwave brightness temperature simulations and snow water equivalent retrievals through a winter season, Remote Sensing of Environment, 117, 236-248.
• Dupont, F., Royer, A., Langlois, A., Gressent, A., Picard, G., Fily, M., Cliche, P. and Chum, M. (2012), Monitoring the melt season length of the Barnes Ice Cap over the 1979–2010 period using active and passive microwave remote sensing data. Hydrol. Process.
• Dupont, F., Picard, G., Royer, A., Fily, M., Langlois, A., Roy, A., and Champollion, N. (2012) Modeling the microwave emission of bubbly ice; Applications to blue ice and superimposed ice in the Antarctic and Arctic, IEEE Transactions on Geosciences and Remote Sensing, Submitted, TGRS_2012-01104.
• Montpetit B., Royer, A., Roy, A., Langlois, A. and Derksen, C. (2012) Snow microwave emission modeling of ice lenses within the snowpack using the Microwave Emission Model for Layered Snowpacks (MEMLS), Hydrological Processes.
• Montpetit B., Royer A., Langlois A., Cliche P., Roy A., Champollion N., Picard G., Domine F., Obbard R. (2012) New short wave infrared albedo measurements for snow specific surface area retrieval, Journal of Glaciology, vol. 58, no. 211.
• Roy, A., Picard, G., Royer, A., Montpetit, B., Dupont, F., Langlois, A., and Derksen, C. (2012) Snow brightness temperature simulations driven by measurements of the specific surface area of snow grains, IEEE Transactions on Geoscience and Remote Sensing, Accepted, TGRS-2012-00591.
• Roy, A., Royer, A., Wigneron, J.-P., Langlois, A., Bergeron, J., Cliche, P. (2012) A simple parameterization for a boreal forest radiative transfer model at microwave frequencies. Remote Sensing of Environment, 124, doi: 10.1016/j.rse.2012.05.020.
• Rutter, N., Sandells, M., Derksen, C., Royer, A., Lemmetyinen, J., Toose, P., Montpetit, B., Langlois, A., and Pulliainen, J. (2012). Snow stratigraphic heterogeneity within ground-based passive microwave radiometer footprints: implications for emission modelling. Journal of Geophysical Research.

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