Home | Our members | Contact us | Français | |  

Alain Royer

 

Regular member

Department of Applied Geomatics, Université de Sherbrooke

2500, boul. de l'Université
Université de Sherbrooke
Quebec, Canada
J1K 2R1

819.821.8000 #62286
Alain.Royer@usherbrooke.ca

 

http://132.203.57.253:8080/donneesweb/document/image/perso_806.jpg

 


 

Research Themes

  • Development of environmental monitoring methods
  • Extraction of physical parameters of snow cover, vegetation and soil by satellite
  • Physics of remote sensing measurements, fusion of visible, thermal infrared and microwave data
  • Spatial geophysics of northern environments in a changing climate
  • Study of atmospheric aerosols and monitoring of air quality by remote sensing
 
 

CEN Students / Postdoctoral fellows

Kramer, Daniel (Doctorate - Codirector). Temporal and spatial snow characterization using high-resolution modeling, microwave remote sensing and UAVs in the Canadian High Arctic.

Meloche, Julien (Master - Codirector). Mapping arctic snow cover using unmanned aerial vehicle (UAV) and simulations from the thermodynamic multilayer model SNOWPACK.

Sasseville, Vincent (Doctorate - Codirector). Implementation of a habitat quality index for the Peary caribou using snow geophysical properties retrieved from satellite remote sensing and modeling.

Vargel, Céline (Doctorate). Snow parameterization and microwave modelling: investigation of the climate change impact on snow dynamic processes in the Arctic, sub-Arctic and Antarctic environments.

 
 

Recent CEN theses

Larue, Fanny , 2018 (Doctorate). Development of a system to assimilate microwave satellite observations into a snow model for hydrological forecasting.

Mavrovic, Alex , 2018 (Master). Dielectric characterization of vegetation and soil at L-band (1.4 GHz) .

Prince, Michaël , 2018 (Master). Northern regions freeze/thaw cycles analysis with L-band passive microwaves remote sensing .

Saint-Jean Rondeau, Olivier , 2018 (Master). Modeling of microwave emission related to physical and microstructural properties of snow.

Busseau, Bruno-Charles , 2017 (Master). Analysis of snow-vegetation interactions in the low Arctic-Subarctic transition zone (Nunavik).

Marchand, Nicolas , 2017 (Doctorate). Surface ground temperature survey in arctic permafrost regions by using remote sensing data assimilated in the canadian landscape surface scheme (CLASS).

Pomerleau, Patrick , 2017 (Master). Design of an automatic device for characterizing the ice by use of a continuous emission radar.

Ouellet, Félix , 2016 (Master - Codirection). Spatialization of the SNOWPACK Snow Model for the Canadian Arctic to assess Peary caribou winter grazing conditions.

Montpetit, Benoit , 2015 (Doctorate). Microwave emission modeling analysis of soils, snow and ice using the Microwave Emission Model of Layered Snowpacks (MEMLS).

Papasodoro, Charles , 2015 (Master). RADARSAT-2 stereo radargrammetry for the melt monitoring of Barnes and Penny Ice Caps (Baffin Island, Nunavut, Canada).

Thériault, Nathalie , 2015 (Master). Improving snow albedo simulations in arctic and subarctic regions of Quebec by using the surface scheme CLASS.

 
 

Scientific communications

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). Article #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. Article #1451. DOI: 10.3390/rs10091451.

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.

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., 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.

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.

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.

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.

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.

Chokmani, K., Bernier, M., Royer, A., 2013. A merging algorithm for regional snow mapping over Eastern Canada from AVHRR and SSM/I data. Remote Sensing, 5(11): 5463-5487. DOI: 10.3390/rs5115463.

Montpetit, B., Royer, A., Roy, A.R., Langlois, A., Derksen, C., 2013. Snow microwave emission modeling of ice lenses within a snowpack using the Mircowave Emission Model of Layered Snowpacks (MEMLS). IEEE Transactions on Geoscience and Remote Sensing, 51(9): 4705-4717. DOI: 10.1109/TGRS.2013.2250509.

Picard, G., Brucker, L., Roy, A.R., Dupont, F., Fily, M., Royer, A., Harlow, C., 2013. Simulation of the microwave emission of multi-layered snowpacks using the Dense Media Radiative transfer theory: the DMRT-ML model. Geoscientific Model Development, 6(4): 1061-1078. DOI: 10.5194/gmd-6-1061-2013.

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. DOI: 10.1109/TGRS.2012.2235842.

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. DOI: 10.5194/tc-7-961-2013.

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. DOI: 10.1007/s10584-012-0470-0.

Dupont, F., Royer, A., Langlois, A., Gressent, A., Picard, G., Fily, M., Cliche, P., 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. Hydrological Processes, 26(17): 2643–2652. DOI: 10.1002/hyp.9382.

Köhn, J., Royer, A., 2012. Microwave brightness temperature as an indicator of near-surface air temperature over snow in Canadian northern regions. International Journal of Remote Sensing, 33(4): 1126-1138. DOI: 10.1080/01431161.2010.550643.

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 (MEMLS) for subartic and arctic snow water equivalent retrievals. Water Resources Research, 48(12): W12524. DOI: 10.1029/2012WR012133.

Montpetit, B., Royer, A., Langlois, A., Cliche, P., Roy, A.R., Champollion, N., Picard, G., Domine, F., Obbard, R., 2012. New shortwave infrared albedo measurements for snow specific surface area retrieval. Journal of Glaciology, 58(211): 941-952. DOI: 10.3189/2012JoG11J248.

Roy, A.R., 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: 371-383. DOI: 10.1016/j.rse.2012.05.020.

Brucker, L., Royer, A., Picard, G., Langlois, A., Fily, M., 2011. Hourly simulations of the microwave brightness temperature of seasonal snow in Quebec, Canada, using a coupled snow evolution-emission model. Remote Sensing of Environment, 115(8): 1966-1977. DOI: 10.1016/j.rse.2011.03.019.

Langlois, A., Royer, A., Dupont, F., Roy, A.R., Goïta, K., Picard, G., 2011. Improved corrections of forest effects on passive microwave satellite remote sensing of snow over boreal and subarctic regions. IEEE Transactions on Geoscience and Remote Sensing, 49(10): 3824-3837. DOI: 10.1109/TGRS.2011.2138145.

Touré, A.M., Goïta, K., Royer, A., Kim, E.J., Durand, M., Margulis, S.A., Lu, H., 2011. A case study of using a multi-layered thermodynamical snow model for radiance assimilation. IEEE Transactions on Geoscience and Remote Sensing, 49(8): 2828-2837. DOI: 10.1109/TGRS.2011.2118761.

Köhn, J., Royer, A., 2010. AMSR-E data inversion for soil temperature estimation under snow cover. Remote Sensing of Environment, 114(12): 2951-2961. DOI: 10.1016/j.rse.2010.08.002.

Langlois, A., Brucker, L., Köhn, J., Royer, A., Derksen, C., Cliche, P., Picard, G., Fily, M., Willemet, J.-M., 2010. Simulation of snow water equivalent (SWE) using thermodynamic snow models in Québec, Canada. Canadian Journal of Hydrometeorology, 10(6): 1447-1462. DOI: 10.1175/2009JHM1154.1.

Langlois, A., Royer, A., Goïta, K., 2010. Analysis of simulated and space borne passive microwave brightness temperatures using in situ measurements of snow and vegetation properties. Canadian Journal of Remote Sensing, 36(suppl. 1): S135-S148. DOI: 10.5589/m10-016.

Langlois, A., Royer, A., Montpetit, B., Picard, G., Brucker, L., Arnaud, L., Harvey-Collard, P., Fily, M., Goïta, K., 2010. On the relationship between snow grain morphology and in-situ near infrared calibrated reflectance photographs. Cold Regions Science and Technology, 61(1): 34-42. DOI: 10.1016/j.coldregions.2010.01.004.

Roy, A.R., Royer, A., Turcotte, R., 2010. Analyse de l'identification de la fonte de neige printanière avec QuickSCAT dans le sud du Québec, Canada. Journal canadien de télédétection, 36(2): 89-98.

Roy, A.R., Royer, A., Turcotte, R., 2010. Improvement of springtime stream?ow simulations in a boreal environment by incorporating snow-covered area derived from remote sensing data. Journal of Hydrology, 390(1-2): 35-44. DOI: 10.1016/j.jhydrol.2010.06.027.

Royer, A., Goïta, K., Köhn, J., DeSève, D., 2010. Monitoring dry, wet and no-snow conditions from microwave satellite observations. IEEE Transactions on Geoscience and Remote Sensing, 7(4): 670-674. DOI: 10.1109/LGRS.2010.2045733.

Royer, A., Poirier, S., 2010. Surface temperature spatial and temporal variations in Northern America from homogenized satellite SSMR-SSM/I microwave measurements and reanalysis for 1979-2008. Journal of Geophysical Research, 115: D08110. DOI: 10.1029/2009JD012760.

Turcotte, R., Fortier Fillion, T.-C., Lacombe, P., Fortin, V., Roy, A.R., Royer, A., 2010. Simulation hydrologique des derniers jours de la crue de printemps: le problème de la neige manquante. Hydrological Sciences - Journal - des Sciences Hydrologiques, 55(6): 872-882. DOI: 10.1080/02626667.2010.503933.

Vachon, F., Goïta, K., DeSève, D., Royer, A., 2010. Inversion of a snow emission model calibrated with in situ data for snow water equivalent monitoring. IEEE Transactions on Geoscience and Remote Sensing, 48(1): 59-71. DOI: 10.1109/TGRS.2009.2026892.

 
© 2019 All rights reserved | Adapted from an original design by BinaryTheme.com