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Alexandre R. Roy


Regular member

Department of Environmental Sciences, UQTR

Léon-Provancher Building
3351, boul. des Forges
Quebec, Canada
G9A 5H7

819.376.5011 extension 3680



Research Themes

  • Cold regions microwave remote sesning
  • Data assimilation
  • Field Campaigns
  • Hydrological and biogeophysical modeling
  • Northern regions climate change

CEN Students / Postdoctoral fellows

Crevier, Charlotte (Master - Codirector). Detection and monitoring of Arctic soil freeze/thaw cycles using C-Band radar data.

Mavrovic, Alex (Doctorate). Carbon fluxes monitoring of arctic regions using multi-frequency microwave remote sensing.


Recent CEN theses

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


Scientific communications

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.

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.

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.

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.

Wang, P., Zhao, T., Shi, J., Hu, T., Roy, A.R., Qiu, Y., Lu, H., 2019. Parameterization of the freeze/thaw discriminant function algorithm using dense in-situ observation network data. International Journal of Digital Earth, 12(8: The Arctic and High Altitude Mountain Cold Regions: Sustainable Earth Observations and Climate Change): 980-994. DOI: 10.1080/17538947.2018.1452300.

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.

King, J., Derkson, C., Toose, P., Langlois, A., Larsen, C., Lemmetyinen, J., Marsh, P., Montpetit, B., Roy, A.R., Rutter, N., Sturm, M., 2018. The influence of snow microstructure on dual-frequency radar measurements in a tundra environment. Remote Sensing of Environment, 215: 242-254. DOI: 10.1016/j.rse.2018.05.028.

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.

Pappas, C., Matheny, A.M., Baltzer, J.L., Barr, A.G., Black, T.A., Gil, B., Detto, M., Maillet, J., Roy, A.R., Sonnentag, O., Stephens, J., 2018. Boreal tree hydrodynamics: asynchronous, diverging, yet complementary. Tree Physiology, 38(7): 953-964. DOI: 10.1093/treephys/tpy043.

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.

Rowlandson, T.L., Berg, A.A., Roy, A.R., Kim, E., Pardo Lara, R., Powers, J., Lewis, K., Houser, P., McDonald, K., Toose, P., Wu, A., De Marco, E., Derkson, C., Entin, J., Colliander, A., Xu, X., Mavrovic, A., 2018. Capturing agricultural soil freeze/thaw state through remote sensing and ground observations: A soil freeze/thaw validation campaign. Remote Sensing of Environment, 211: 59-70. DOI: 10.1016/j.rse.2018.04.003.

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.

Williamson, M., Rowlandson, T.L., Berg, A.A., Roy, A.R., Toose, P., Derksen, C., Arnold, L., Tetlock, E., 2018. L-band radiometry freeze/ thaw validation using air temperature and ground measurements. Remote Sensing Letters, 9(4): 403-410. DOI: 10.1080/2150704X.2017.1422872.

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.

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.

Saberi, N., Kelly, R., Toose, P., Roy, A.R., Dersken, C., 2017. Modeling the observed microwave emission from shallow multi-layer tundra snow using DMRT-ML. Remote Sensing, 9(12), 1327. DOI: 10.3390/rs9121327.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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