Alain Royer – CARTEL

Research topics[ap_divider color= »#CCCCCC » style= »solid » thickness= »1px » width= »100% » mar_top= »20px » mar_bot= »20px »]My field of work is oriented towards the study and monitoring of our environment, including the use of remote sensing tools. In addition, I am interested in global climate change and indirectly in the physical phenomena that occur in the atmosphere. I am also developing methods for estimating, by remote sensing, the water equivalent of snow in a hydroelectric production context.

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Email[ap_divider color= »#CCCCCC » style= »solid » thickness= »1px » width= »100% » mar_top= »20px » mar_bot= »20px »]Alain.Royer@USherbrooke.ca [ap_spacing spacing_height= »15px »]

Current projects[ap_divider color= »#CCCCCC » style= »solid » thickness= »1px » width= »100% » mar_top= »20px » mar_bot= »20px »]Satellite monitoring and estimation of snow cover, snow water supply and ground temperatures Thermal and microwave infrared data fusion Development of methods for monitoring the northern environment in the context of climate change Forest fire detection Atmospheric aerosol study and air quality monitoring by remote sensing [ap_spacing spacing_height= »15px »]

Publications (selected articles) [ap_divider color= »#CCCCCC » style= »solid » thickness= »1px » width= »100% » mar_top= »20px » mar_bot= »20px »]

Voglimacci-Stephanopoli, J., Wendleder, A., Lantuit, H., Langlois, A., Stettner, S., Schmitt, A., … & Royer, A. (2022). Potential of X-band polarimetric synthetic aperture radar co-polar phase difference for arctic snow depth estimation. The Cryosphere, 16(6), 2163-2181.
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), 1380-1396.
Royer, A., Roy, A., Jutras, S., & Langlois, A. (2021). Performance assessment of radiation-based field sensors for monitoring the water equivalent of snow cover (SWE). The Cryosphere, 15(11), 5079-5098.
Meloche, J., Langlois, A., Rutter, N., Royer, A., King, J., & Walker, B. (2021). Characterizing Tundra snow sub-pixel variability to improve brightness temperature estimation in satellite SWE retrievals. The Cryosphere Discussions, 1-22.
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, 515.
Royer, A., Domine, F., Roy, A., Langlois, A., Marchand, N., & Davesne, G. (2021). New northern snowpack classification linked to vegetation cover on a latitudinal mega-transect across northeastern Canada. Écoscience, 1-18.
Mavrovic, A., Pardo Lara, R., Berg, A., Demontoux, F., Royer, A., & Roy, A. (2021). Soil dielectric characterization during freeze–thaw transitions using L-band coaxial and soil moisture probes. Hydrology and Earth System Sciences, 25(3), 1117-1131.
Royer A. (2020) Crises économiques, CO₂ et Climat : gare à l’effet pendule. Le Climatoscope, Université de Sherbrooke, 2, 21-26.
Pomerleau P., A. Royer, A. Langlois, P. Cliche, B. Courtemanche, J.-B. Madore, G. Picard and E. Lefebvre (2020). Low cost and compact FMCW 24 GHz radar applications for snowpack and ice thickness measurements. Sensors (MDPI), 20(14), 3909.
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, 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.
Meloche, J., Royer, A., Langlois, A., Rutter, N., & Sasseville, V. (2020). Improvement of microwave emissivity parameterization of frozen Arctic soils using roughness measurements derived from photogrammetry. International Journal of Digital Earth, 1-17.
Mavrovic, A., Pardo Lara, R., Berg, A., Demontoux, F., Royer, A., & Roy, A. (2020). Soil dielectric characterization at L-band microwave frequencies during freeze-thaw transitions. Hydrology and Earth System Sciences Discussions, 1-22.
Rutter, N., Sandells, M. J., Derksen, C., King, J., Toose, P., Wake, L., Watts, T., Essery, R., Roy, A., Royer, A., Marsh, P., Larsen, C. and M. Sturm (2019). Effect of snow microstructure variability on Ku-band radar snow water equivalent retrievals. The Cryosphere, 13, 3045–3059.
Royer A. (2019). Alerte dans les hautes latitudes nord : l’Arctique réagit au réchauffement climatique. Le Climatoscope, 1, 25-28.
Prince, M., Roy, A., 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.
Prince, M., Roy, A., Brucker, L., Royer, A., Kim, Y., and Zhao, T. (2018) Northern Hemisphere surface freeze–thaw product from Aquarius L-band radiometers. Earth System Science Data, 10, 2055-2067.
Larue, F., Royer, A., De Sève, D., Roy, A., and 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, 5711-5734.
Marchand, N., Royer, A., Krinner, G., Roy, A., Langlois, A. 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.
Larue F., A. Royer, D. DeSève, A. Roy, G. Picard, V. Vionnet (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 : 4823-4848. (PDF)
Mavrovic A., A. Roy, A. Royer, B. Filali, F. Boone, C. Pappas and O. Sonnentag (2018). Dielectric characterization of vegetation in L-band using an open-ended coaxial probe. Geoscientific Instrumentation, Methods and Data Systems, 7 : 195-208.
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 Letter, 45. (PDF)
Lyu H, K. A. McColl, X. Li, C. Derksen, A. Berg, T. A. Black, E. Euskirchen, M. Loranty, J. Pulliainen, K. Rautiainen,
T. Rowlandson, A. Roy, A. Royer, A. Langlois, J. Stephens, Hui Lu and D. Entekhabi (2018). Validation of the SMAP freeze/thaw product using categorical triple collocation. Remote Sensing of Environment, 205 : 329-337. (PDF)
Montpetit B., A. Royer, A. Roy and A. Langlois (2018). In-situ passive microwave parameterization of sub-arctic frozen organic soils. Remote Sensing of Environment, 205 : 112–118. (PDF)
Dolant C., A. Langlois, L. Brucker, A. Royer, A. Roy and B. Montpetit (2017). Meteorological inventory of Rain-On-Snow events in the Canadian Arctic Archipelago and satellite detection assessment using passive microwave data. Physical Geography, 5, 39 : 428-444.
Blanchard Y., A. Royer, N. O’Neill, D. Turner and E. Eloranta (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.
Roy, A., P. Toose, C. Derksen, T. Rowlandson, A. Berg, J. Lemmetyinen,A. Royer, E. Tetlock, W. Helgason and O. Sonnentag (2017). Spatial Variability of L-Band Brightness Temperature during Freeze/Thaw Events over a Prairie Environment. Remote Sensing, 9 : 894.
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.
Derksen C., X. Xu, R.S. Dunbar, A. Colliander, Y. Kim, J. Kimball, A. Black, E. Euskirchen, A. Langlois, M. Loranty, P. Marsh, K. Rautiainen, A. Roy, A. Royer and J. Stephens (2017). Retrieving landscape freeze/thaw state from Soil Moisture Active Passive (SMAP) radar and radiometer measurements. Remote Sensing of Environment, 194 : 48–62.
Wigneron J.P., T.J. Jackson, P. O’Neill, G.J. De Lannoy, P. de Rosnay, J.P. Walker, P. Ferrazzoli, V. Mironov, S. Bircher, J.P. Grant, M. Kurum, M. Schwank, J. Munoz-Sabater, N. Das, A. Royer, A. Al-Yaari, A. Al Bitar, R. Fernandez-Moran, H. Lawrence, A. Mialon, M. Parrens, P. Richaume, S. Delwart and Y. Kerr (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, Invited Review Paper, 192 : 238–262.
Busseau B.C., A. Royer, A. Langlois and F. Domine (2017). Analysis of snow-vegetation interactions in the Low Arctic – Subarctic transition zone (north-eastern Canada). Physical Geography, DOI: 10.1080/02723646.2017.1283477
Roy A., P. Toose, M. Williamson, T. Rowlandson, C. Derksen, A. Royer, A. Berg, J. Lemmetyinen and L. Arnold (2017). Response of L-Band brightness temperatures to freeze/thaw and snow dynamics in a prairie environment from ground-based radiometer measurements. Rem. Sens. of Enviro., 191 : 67-80.
Toose P., A. Roy, F. Solheim, C. Derksen, T. Watts, A. Royer and A. Walker (2017). Radio-frequency interference mitigating hyperspectral L-band radiometer. Geosci. Instrum. Method. Data Syst., 6 : 39–51. doi:10.5194/gi-6-39-2017.
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.
Roy A., A. Royer, O. St-Jean-Rondeau, B. Montpetit, G. Picard, A. Mavrovic, N. Marchand, and A. Langlois (2016) Microwave snow emission modeling uncertaintiesin boreal and subarctic environments. The Cryosphere, 10 : 623-638.
Papasodoro C., A. Royer, A. Langlois and E. Berthier (2016) Potential of RADARSAT-2 stereo radargrammetryfor the generation of glacier digital elevation models. J. of Glaciology, 62(233) : 486-496.