Alain Royer
Regular member
Department of Applied Geomatics
University of Sherbrooke


Daniel Kramer (Ph.D. student)

Julien Meloche (Postdoctoral fellow)

Vincent Sasseville (Ph.D. student)

Recent Theses and Dissertations

Julien Meloche (Doctorate - 2021)
Improvement of Arctic snow and soil characterization to improve the snow water equivalent prediction in microwave remote sensing

Céline Vargel (Doctorate - 2020)
Characterization of the arctic snow cover, climate monitoring and microwave remote sensing

Scientific Communications

Laliberté, J., Langlois, A., Royer, A., Madore, J.-B., Gauthier, F., 2022. Retrieving dry snow stratigraphy using a versatile low-cost frequency modulated continuous wave (FMCW) K-band radar. Physical Geography, 43(3): 308-332. DOI: 10.1080/02723646.2021.2008104.

Meloche, J., Langlois, A., Rutter, N., McLennan, D., Royer, A., Billecocq, P., Ponomarenko, S., 2022. High-resolution snow depth prediction using Random Forest algorithm with topographic parameters: A case study in the Greiner watershed, Nunavut. Hydrobiologia, 36(3), e14546. DOI: 10.1002/hyp.14546.

Meloche, J., Langlois, A., Rutter, N., Royer, A., King, J., Walker, B., Philip, M., Wilcox, E., 2022. Characterizing tundra snow sub-pixel variability to improve brightness temperature estimation in satellite SWE retrievals. The Cryosphere, 16(1): 87-101. DOI: 10.5194/tc-16-87-2022.

Voglimacci, J., Wendleder, A., Lantuit, H., Langlois, A., Stettner,., Schmitt, A., Roth, A., Dedieu, J.-P., Royer, A., 2022. Potential of X-band polarimetric SAR co-polar phase difference for arctic snow depth estimation. The Cryosphere, 16(6): 2163-2181. DOI: 10.5194/tc-2021-314.

Mavrovic, A., Pardo Lara, R., Berg, A., Demontoux, F., Royer, A., Roy, A.R., 2021. Soil dielectric characterization during freeze–thaw transitions using L-band coaxial and soil moisture probes. Hydrology and Earth System Sciences, 25: 1117-1131. DOI: 10.5194/hess-25-1117-2021.

Meloche, J., Royer, A., Langlois, A., Rutter, N., Sasseville, V., 2021. Improvement of microwave emissivity parameterization of frozen Arctic soils using roughness measurements derived from photogrammetry. International Journal of Digital Earth, 14(10: Remote Sensing Experiments for Earth System Science): 1380-1396. DOI: 10.1080/17538947.2020.1836049.

Royer, A., Domine, F., Roy, A.R., Langlois, A., Marchand, N., Davesne, G., 2021. New northern snowpack classification linked to vegetation cover on a latitudinal mega-transect across northeastern Canada. Écoscience, 28(3-4): 225-242. DOI: 10.1080/11956860.2021.1898775.

Royer, A., Picard, G., Vargel, C., Langlois, A., Gouttevin, I., Dumont, M., 2021. Improved simulation of arctic circumpolar land area snow properties and soil temperatures. Frontiers in Earth Science, 9, 685140. DOI: 10.3389/feart.2021.685140.

Royer, A., Roy, A.R., Jutras, S., Langlois, A., 2021. Review article: Performance assessment of radiation-based field sensors for monitoring the water equivalent of snow cover (SWE). The Cryosphere, 15: 5079-5098. DOI: 10.5194/tc-15-5079-2021.

Langlois, A., Royer, A., Montpetit, B., Roy, A.R., 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, 7, 347. DOI: 10.3389/feart.2019.00347.

Mavrovic, A., Madore, J.-B., Langlois, A., Royer, A., Roy, A.R., 2020. Snow liquid water content measurement using an open-ended coaxial probe (OECP). Cold Regions Science and Technology, 171, 102958. DOI: 10.1016/j.coldregions.2019.102958.

Pomerleau, P., Royer, A., Langlois, A., Cliche, P., Courtemanche, B., Madore, J.-B., Picard, G., Lefebvre, É., 2020. Low cost and compact FMCW 24 GHz radar applications for snowpack and ice thickness measurements. Sensors, 20(14), 3909. DOI: 10.3390/s20143909 .

Roy, A.R., Toose, P., Mavrovic, A., Pappas, C., Royer, A., Derksen, C., Berg, A., Rowlandson, T., El-Amine, M., Barr, A., Black, A., Langlois, A., 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, 273, 111542. DOI: 10.1016/j.rse.2019.111542.

Royer, A., 2020. Crise économique, CO2 et climat: Gare à l'effet pendule. Le Climatoscope, Septembre 2020(2): 21-26.

Vargel, C., Royer, A., Saint-Jean Rondeau, O., Picard, G., Roy, A.R., Sasseville, V., Langlois, A., 2020. Arctic and subarctic snow microstructure analysis for microwave brightness temperature simulations. Remote Sensing of Environment, 242, 11754. DOI: 10.1016/j.rse.2020.111754.

Prince, M., Roy, A.R., Royer, A., 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, 231, 111230. DOI: 10.1016/j.rse.2019.111230.

Royer, A., 2019. Alerte dans les hautes latitudes nord: l’Arctique réagit au réchauffement climatique. Le Climatoscope, Septembre 2019(1): 25-28.

Rutter, N., Sandells, M.S., Derksen, C., King, J., Toose, P., Wake, L., Watts, T., Essery, R., Roy, A.R., Royer, A., Marsh, P., Larsen, C., Sturm, M., 2019. Effect of snow microstructure variability on Ku-band radar snow water equivalent retrievals. The Cryosphere, 13(11): 3045–3059. DOI: 10.5194/tc-13-3045-2019.

Dolant, C., Langlois, A., Brucker, L., Royer, A., Roy, A.R., 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, 39(5): 428-444. DOI: 10.1080/02723646.2017.1400339.

Dolant, C., Montpetit, B., Langlois, A., Brucker, L., Zolina, O., Johnson, C., Royer, A., Smith, P., 2018. Assessment of the Barren Ground caribou die‐off during winter 2015–2016 using passive microwave observations. Geophysical Research Letters, 45(10): 4908-4916. DOI: 10.1029/2017GL076752.

Larue, F., Royer, A., DeSève, D., Roy, A.R., Cosme, E., 2018. Assimilation of passive microwave AMSR-2 satellite observations in a snowpack evolution model over northeastern Canada. Hydrology and Earth System Sciences, 22(11): 5711-5734. DOI: 10.5194/hess-22-5711-2018.

Larue, F., Royer, A., DeSève, D., Roy, A.R., Picard, G., Vionnet, V., Cosme, E., 2018. Simulation and assimilation of passive microwave data using a snowpack model coupled to a calibrated radiative transfer model over North‐Eastern Canada. Water Resources Research, 54(7): 4823-4848. DOI: 10.1029/2017WR022132.

Lyu, H., McColl, K.A., Li, X., Derksen, C., Berg, A., Black, T.A., Euskirchen, E., Loranty, M.M., Pulliainen, J., Rautiainen, K., Rowlandson, T., Roy, A.R., Royer, A., Langlois, A., Stephens, J., Lu, H., Entekhabi, D., 2018. Validation of the SMAP freeze/thaw product using categorical triple collocation. Remote Sensing of Environment, 205: 329-337. DOI: 10.1016/j.rse.2017.12.007.

Marchand, N., Royer, A., Krinner, G., Roy, A.R., Langlois, A., 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, 10(11), 1703. DOI: 10.3390/rs10111703.

Mavrovic, A., Roy, A.R., Royer, A., Filali, B., Boone, F., Pappas, C., Sonnentag, O., 2018. Dielectric characterization of vegetation at L band using an open-ended coaxial probe. Geoscientific Instrumentation, Methods and Data Systems, 7(3): 195-208. DOI: 10.5194/gi-7-195-2018.

Montpetit, B., Royer, A., Roy, A.R., Langlois, A., 2018. In-situ passive microwave emission model parameterization of sub-arctic frozen organic soils. Remote Sensing of Environment, 205: 112-118. DOI: 10.1016/j.rse.2017.10.033.

Prince, M., Roy, A.R., Brucker, L., Royer, A., Kim, Y., Zhao, T., 2018. Northern Hemisphere surface freeze–thaw product from Aquarius L-band radiometers. Earth System Science Data, 10(4): 2055-2067. DOI: 10.5194/essd-10-2055-2018.

Roy, A.R., Leduc-Leballeur, M., Picard, G., Royer, A., Toose, P., Dersken, C., Lemmetyinen, J., Berg, A., Rowlandson, T., Schwank, M., 2018. Modelling the L-band snow-covered surface emission in a winter canadian prairie environment. Remote Sensing, 10, 1451. DOI: 10.3390/rs10091451.

Royer, A., 2018. La neige racontée du ciel: Impacts du réchauffement climatique. Muséum de Grenoble. Grenoble.

Royer, A., 2018. L’éau et la glace. Festival des technologies vertes, Parc de l'Impérial. Annecy.

Royer, A., 2018. L'observation satellite peut-elle améliorer les modèles d'évolution du couvert nival? l'Institut des Géosciences de l’Environnement, Bâtiment Glaciologie. Grenoble.

Royer, A., 2018. Télédétection micro-onde de la cryosphère au Canada. Centre d’Études Spatiales de la Biosphère. Toulouse.

Blanchard, Y., Royer, A., O'Neill, N., Turner, D.D., Eloranta, E.W., 2017. Thin ice clouds in the Arctic: cloud optical depth and particle size retrieved from ground-based thermal infrared radiometry. Atmospheric Measurement Techniques, 10: 2129-2147. DOI: 10.5194/amt-10-2129-2017.

Busseau, B.-C., Royer, A., Roy, A.R., Langlois, A., Domine, F., 2017. Analysis of snow-vegetation interactions in the low Arctic-Subarctic transition zone (northeastern Canada). Physical Geography, 38(2): 159-175. DOI: 10.1080/02723646.2017.1283477.

Derksen, C., Xu, X., Dunbar, R.S., Colliander, A., Kim, Y., Kimball, J.S., Black, T.A., Euskirchen, E., Langlois, A., Loranty, M.M., Marsh, P., Rautiainen, K., Roy, A.R., Royer, A., Stephens, J., 2017. Retrieving landscape freeze/thaw state from Soil Moisture Active Passive (SMAP) radar and radiometer measurements. Remote Sensing of Environment, 194: 48-62. DOI: 10.1016/j.rse.2017.03.007.

Langlois, A., Johnson, C.-A., Montpetit, B., Royer, A., Blukacz-Richards, E.A., Neave, E., Dolant, C., Roy, A.R., Arhonditsis, G., Kim, D.-K., Kaluskar, S., 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, 189: 84-95. DOI: 10.1016/j.rse.2016.11.006.

Larue, F., Royer, A., DeSève, D., Langlois, A., Roy, A.R., Brucker, L., 2017. Validation of GlobSnow-2 snow water equivalent over Eastern Canada. Remote Sensing of Environment, 194: 264-277. DOI: 10.1016/j.rse.2017.03.027.

Ouellet, F., Langlois, A., Blukacz-Richards, E.A., Johnson, C., Royer, A., Neave, E., Larter, N.C., 2017. Spatialization of the SNOWPACK snow model for the Canadian Arctic to assess Peary caribou winter grazing conditions. Physical Geography, 38(2): 143-158. DOI: 10.1080/02723646.2016.1274200.

Roy, A.R., Toose, P., Derksen, C., Rowlandson, T., Berg, A.A., Lemmetyinen, J., Royer, A., Tetlock, E., Helgason, W., Sonnentag, O., 2017. Spatial variability of L-band brightness temperature during freeze/thaw events over a prairie environment. Remote Sensing, 9(9): 894. DOI: 10.3390/rs9090894.

Roy, A.R., Toose, P., Williamson, M., Rowlandson, T., Derksen, C., Royer, A., Berg, A.A., Lemmetyinen, J., Arnold, L., 2017. Response of L-Band brightness temperatures to freeze/thaw and snow dynamics in a prairie environment from ground-based radiometer measurements. Remote Sensing of Environment, 191: 67-80. DOI: 10.1016/j.rse.2017.01.017.

Royer, A., Roy, A.R., Montpetit, B., Saint-Jean Rondeau, O., Picard, G., Brucker, L., Langlois, A., 2017. Comparison of commonly-used microwave radiative transfer models for snow remote sensing. Remote Sensing of Environment, 190: 247-259. DOI: 10.1016/j.rse.2016.12.020.

Toose, P., Roy, A.R., Solheim, F., Derksen, C., Watts, T., Royer, A., Walker, A., 2017. Radio-frequency interference mitigating hyperspectral L-band radiometer. Geoscientific Instrumentation, Methods and Data Systems, 6(1): 39-51. DOI: 10.5194/gi-6-39-2017.

Wigneron, J.-P., Jackson, T.J., O'Neill, P., De Lannoy, G., de Rosnay, P., Walker, J.P., Ferrazzoli, P., Mironov, V., Bircher, S., Grant, J.P., Kurum, M., Schwank, M., Munoz-Sabater, J., Das, N., Royer, A., Al-Yaari, A., Al Bitar, A., Fernandez-Moran, R., Lawrence, H., Mialon, A., Parrens, M., Richaume, P., Delwart, S., Kerr, Y., 2017. Modelling the passive microwave signature from land surfaces: A review of recent results and application to the L-band SMOS & SMAP soil moisture retrieval algorithms. Remote Sensing of Environment, 192: 238-262. DOI: 10.1016/j.rse.2017.01.024.

Dolant, C., Langlois, A., Montpetit, B., Brucker, L., Roy, A.R., Royer, A., 2016. Development of a rain-on-snow detection algorithm using passive microwave radiometry. Hydrological Processes, 30(18): 3184-3196. DOI: 10.1002/hyp.10828.

Langlois, A., Royer, A., 2016. Le couvert nival arctique en changement: une odyssée de la modélisation à la télédétection. Colloque du CEN 2016, Université du Québec à Trois-Rivières. Trois-Rivières, Québec, Canada.

Larue, F., Royer, A., DeSève, D., Langlois, A., Roy, A.R., Saint-Jean Rondeau, O., 2016. Assimilation des observations satellitaires micro-onde passives AMSR-2 dans un modèle de neige. Colloque du CEN 2016, Université du Québec à Trois-Rivières. Trois-Rivières, Québec, Canada.

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. DOI: 10.1017/jog.2016.44.

Roy, A.R., Royer, A., Derksen, C., Toose, P., Brucker, L., Mialon, A., Langlois, A., Kerr, Y., 2016. L’utilisation de la radiométrique micro-onde satellitaire pour le suivi du gel/dégel des surfaces nordiques. Colloque du CEN 2016, Université du Québec à Trois-Rivières. Trois-Rivières, Québec, Canada.

Roy, A.R., Royer, A., St-Jean-Rondeau, O., Montpetit, B., Picard, G., Mavrovic, A., Marchand, N., Langlois, A., 2016. Microwave snow emission modeling uncertainties in boreal and subarctic environments. The Cryosphere, 10(2): 623-638. DOI: 10.5194/tc-10-623-2016.

Saint-Jean Rondeau, O., Royer, A., Roy, A.R., Langlois, A., Madore, J.-B., 2016. Paramétrisation de la microstructure du manteau neigeux pour la radiométrie micro-onde. Colloque du CEN 2016, Université du Québec à Trois-Rivières. Trois-Rivières, Québec, Canada.

André, C., Ottlé, C., Royer, A., Maignan, F., 2015. Land surface temperature retrieval over circumpolar Arctic using SSM/I–SSMIS and MODIS data. Remote Sensing of Environment, 162: 1-10. DOI: 10.1016/j.rse.2015.01.028.

Courtemanche, B., Montpetit, B., Royer, A., Roy, A.R., 2015. Creation of a lambertian microwave surface for retrieving the downwelling contribution in ground-based radiometric measurements. IEEE Transactions on Geoscience and Remote Sensing, 12(3): 462-466. DOI: 10.1109/LGRS.2014.2346138.

Marchand, N., Roy, A.R., Larue, F., Dolant, C., St-Jean, O., Montpetit, B., Langlois, A., Royer, A., 2015. Suivi du couvert nival et du gel au sol par télédétection micro-onde. Colloque du CEN 2015. Québec, Québec, Canada.

Montpetit, B., Royer, A., Wigneron, J.-P., Chanzy, A., Mialon, A., 2015. Evaluation of multi-frequency bare soil microwave reflectivity models. Remote Sensing of Environment, 162: 186-195. DOI: 10.1016/j.rse.2015.02.015.

Ouellet, F., Langlois, A., Royer, A., Johnson, C.A., Richards, A., 2015. Spatialisation du modèle de couvert nival SNOWPACK dans le Nord canadien pour l’étude de l’accès à la nourriture du caribou de Peary. Colloque du CEN 2015. Québec, Québec, Canada.

Papasodoro, C., Berthier, É., Royer, A., Zdanowicz, C., Langlois, A., 2015. Area, elevation and mass changes of the two southernmost ice caps of the Canadian Arctic Archipelago between 1952 and 2014. The Cryosphere, 9: 1535-1550. DOI: 10.5194/tc-9-1535-2015.

Papasodoro, C., Royer, A., Langlois, A., Berthier, É., 2015. Stéréo-radargrammétrie RADARSAT-2 et stéréo-optique pléiades pour le suivi de la fonte des calottes glaciaires de l’Île de Baffin, NU. Colloque du CEN 2015. Québec, Québec, Canada.

Roy, A.R., Royer, A., Derksen, C., Brucker, L., Langlois, A., Mialon, A., 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, 8(9): 4442-4459. DOI: 10.1109/JSTARS.2015.2476358.

Bergeron, J., Royer, A., Turcotte, R., Roy, A.R., 2014. Snow cover estimation using blended MODIS and AMSR-E data for improved watershed-scale spring streamflow simulation in Quebec, Canada. Hydrological Processes, 28: 4626-4639. DOI: 10.1002/hyp.10123.

Dupont, F., Picard, G., Royer, A., Fily, M., Roy, A.R., Langlois, A., 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. DOI: 10.1109/TGRS.2014.2299829.

Langlois, A., Bergeron, J., Brown, R., Royer, A., Harvey, R., Roy, A.R., Wang, L., 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. Journal of Hydrology, 15(4): 1325-1343. DOI: 10.1175/JHM-D-13-055.1.

Picard, G., Royer, A., Arnaud, L., Fily, M., 2014. Influence of meter-scale wind-formed features on the variability of the microwave brightness temperature around Dome C in Antarctica. The Cryosphere, 8: 1105-1119. DOI: 10.5194/tc-8-1105-2014.

Roy, A.R., Royer, A., Hall, R.J., 2014. Relationship between forest microwave transmissivity and structural parameters for the canadian boreal forest. IEEE Transactions on Geoscience and Remote Sensing, 11(10): 1802-1806. DOI: 10.1109/LGRS.2014.2309941.

Rutter, N., Sandells, M., Derksen, C., Toose, P., Royer, A., Montpetit, B., Langlois, A., Lemmetyinen, J., Pulliainen, J., 2014. Snow stratigraphic heterogeneity within ground-based passive microwave radiometer footprints: Implications for emission modeling. Journal of Geophysical Research, 119(3): 550–565. DOI: 10.1002/2013JF003017.

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