Research topics

My fields of study are mainly geophysics and remote sensing for monitoring natural hazards in a changing environment. My main focus is on the polar regions where my studies attempt to establish the complex links between human activity, climate change and associated natural hazards. I try to see the evolution of these risks in the long term using models by integrating field measurements.


Email

Alexandre.Langlois2@USherbrooke.ca  

Research program 

The main goal of the research program is to better characterize the impact of climate change in northern regions in a geohazard context. The recent craze for the North’s natural resources is creating an unprecedented increase in the need for energy, infrastructure, development, transportation, resource development and services, all of which are highly sensitive to climate change. With melting intimately linked to rising temperatures, there is a pressing need for the development of adaptation approaches in resource and infrastructure management to protect northern ecosystems and ensure the economic, social and cultural well-being of northern peoples. The program has 3 main axes: Characterization of the current impact of climate change in northern regions and the issues with the highest level of geohazard. Characterize geohazards in a context of predicting climate change under specific CO2 increase scenarios. Develop adaptation and planning strategies in accordance with objective 2. using geographic information systems, GIS. Keywords – Cryosphere and climate change; Land and ocean studies; Socio-economic issues and sustainable development; Atmospheric and ocean dynamics; Snow and sea ice; Multi-scale remote sensing (in-situ/airborne/satellite); Geohazard; Modelling and geographic information system (GIS); Project management; Arctic environmental issues.

Current projects 

1. Evaluation and improvement of the representation of snow cover in the Canadian Regional Climate models CRCM4 and CRCM5 over northern Québec The main objective of the proposed project is to evaluate and improve the representation of snow cover within the Canadian Regional Climate Model MRCC4 and MRCC5 in northern Quebec. Research activities include an assessment of the characterization of important snow cover processes in MRCC4 and MRCC5 in northern Quebec using new in-situ and remote sensing databases, the development of improved snow cover treatment, and a local climate sensitivity analysis in response to various snow-related processes. Team: Environment Canada, Ouranos, Université de Sherbrooke

2. Sila-illusaq The purpose of this project is therefore to study the interactions between snow, vegetation, permafrost and climate at subarctic and Arctic sites in order to quantitatively understand and predict (1) the future thermal regime of permafrost and (2) future GHG emissions from molten permafrost. Team: Takuvik, GAME, LGGE, CEN-UL, INRS-ÉTÉ, UQTR, Université de Sherbrooke, McGill University

3. Suivi de la fonte des calottes glaciaires du Nord par télédétection This project is part of the Natural Resources Canada’s Carto-Nord project to complete topographic coverage of Canada’s North at a scale of 1:50,000, led by the Centre for Topographic Information in Sherbrooke (CIT), in collaboration with the Canada Centre for Remote Sensing. Team: CIT, Université de Sherbrooke, University of Ottawa, Geological Survey of Canada, Parks Canada, CPSP, Canada Centre for Remote Sensing

4. France-Québec collaboration This project is the continuation of a collaboration that has been ongoing for several years between the Université de Sherbrooke and the Laboratoire de Glaciologie et Géophysique de l’Environnement de Grenoble, France. The main goal is to promote and develop innovative methods for measuring snow cover. Team: Université de Sherbrooke, Laboratoire de Glaciologie et Géophysique de l’Environnement (LGGE)-CNRS-Université Joseph Fourier (Grenoble, France), Centre d’Étude de la Neige (Grenoble, France)

5. Monitoring of extreme winter weather events in the Arctic This project focuses on the development of methods for monitoring extreme climate events in the Arctic using in-situ and satellite measurements. In particular, the development of microwave methods is used to monitor rain-on-snow, heat waves and extreme precipitation. Team: Environment Canada, LGGE, CEN-UL, Université de Sherbrooke

6. Monitoring and modelling of winter snowmelt in the Arctic The main goal of the project is to better understand the impact of these winter melt events on the properties of the air-soil-ice interface in order to develop semi-empirical methods for satellite detection of winter melt and to model the snow cover under such conditions. Efforts will focus on two fronts: 1) tundra in Nunavik and 2) the Barnes Ice Cap in Baffin Island, Nunavut. Team: Clark University, UQTR, LGGE, Université de Sherbrooke

7. Improving avalanche risk prediction: measurements and modelling The purpose of this project is to improve the risk modeling from the SNOWPACK model using field measurements. State-of-the-art instruments developed over the past 5 years provide essential information for the realization of the project. Team: Parks Canada, University of Calgary, SLF-Davos, Centre d’avalanche de la Haute Gaspésie, Université de Sherbrooke

8. Assessment of food access conditions of the Caribou Peary in the Canadian Arctic Archipelago by modelling Climate change is causing significant changes in snow conditions, affecting food access conditions for some species, including the Caribou Peary. The project therefore aims to model the state of past, present and future snow cover to determine the spatial and temporal evolution of food access conditions. Team: Environment Canada, Université de Sherbrooke


Publications

  • 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.
  • 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.
  • Busseau, B.-C., Royer, A., Langlois, A., Barrère, M. And Domine, F. (2015) Analysis of the Interactions between Snow and Vegetation over low Arctic – Subarctic transition (North Eastern Canada). Physical Geography, 38:2, 159-175.
  • 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.
  • Dolant, C., Langlois, A., Montpetit, B., Brucker, L., Roy, A., and Royer, A. (2015) Development of a rain-on-snow detection algorithm using passive microwave radiometry. Hydrological Processes. 30, 18 : 3184–3196
  • 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, doi: http://dx.doi.org/10.1175/JHM-D-13-055.1
  • 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, doi:10.1002/2013JF003017.
  • 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, doi:10.5194/tc-7-961-2013
  • 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, DOI: 10.1007/s10584-012-0470-0.
  • 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. doi: 10.1002/hyp.9382
  • 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, doi: 10.3189/2012JoG11j248.
  • 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.
  • Ching, Y.,Langlois, A. and Barber, D.G. (2011) On the metamorphic processes controlling snow evolution over Arctic first-year sea ice in spring. Part I: Intercomparison of Observations, Submitted to Journal of Geophysical Research, December 2011
  • Dupont, F., Royer, A., Langlois, A., Gressent, A., Picard, G., Fily, M., Cliche, P. And Chum, M. (2011) Monitoring of Barnes ice cap seasonal melt duration over the last 30 years using active and passive microwave remote sensing data, Hydrological Processes, Submitted, August 2011.
  • Derksen, C., Toose, P., Lemmetyinen, J., Pulliainen, J., Langlois, A. And Rutter, N. (2011) Evaluation of passive microwave brightness temperature simulations and snow water equivalent retrievals through a winter season, Remote Sensing of Environment, Submitted, April 2011.
  • Langlois, A., Royer, A., Dupont, F., Roy, A., Goïta, K.and 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, no. 10, 3824-3837.
  • Brucker, L., Royer, A., Picard, G., Langlois, A. and Fily, M. (2011) Hourly simulations of seasonal snow microwave brightness temperature using coupled snow evolution-emission models in Québec, Canada. Remote Sensing of Environment, 115, 115, pp. 1966-1977.
  • Scharien, R.K., Geldsetzer, T., Barber, D.G., Yackel, J.J., and Langlois, A. (2010) Physical, dielectric, and C-band microwave scattering properties of first-year sea ice during advanced melt, Journal of Geophysical Research, Vol. 115, C12026, doi: 10.1029/2010JC006257
  • Langlois, A., Royer, A., Montpetit, B., Picard, G., Brucker, L., Arnaud L., Harvey-Collard, P., Fily, M. and Goïta, K. (2010) On the relationship between snow grain morphology and in-situ near infrared calibrated reflectance photographs. Cold Regions Science and Technology, 61, pp. 34-42. doi:10.1016/j.coldregions.2010.01.004
  • Langlois, A., Royer, A and Goïta, K. (2010) Analysis of simulated and spaceborne passive microwave brightness temperatures using in-situ measurements of snow and vegetation properties, Canadian IPY Special Issue of Canadian Journal of Remote Sensing, Vol. 36, No. 1, pp. 135-148.
  • Langlois, A., Brucker, L., Kohn, J., Royer, A., Derksen, C., Cliche, P., Picard, G., Fily, M. and Willemet, J.M. (2009) Regional Retrieval of Snow Water Equivalent (SWE) using Thermodynamic Snow Models in Québec, Canada. Journal of Hydrometeorology, Vol. 10, No. 6, 1447-1463.
  • Geldsetzer, T., Langlois, A. and Yackel, J. (2009) Dielectric properties of brine-wetted snow on first-year sea ice. Cold Regions Science and Technology, 58, 47-56.
  • Isleifson, D., Langlois, A., Barber, D.G. and Shafai, L. (2009) C-Band Scatterometer Measurement of Multiyear Sea Ice before fall freeze-up in the Canadian Arctic. IEEE Transactions on Geoscience and Remote Sensing. 47(6), 1651-1661.
  • Langlois, A., Brucker, L., Kohn, J., Royer, A., Derksen, C., Cliche, P., Picard, G., Willemet, J.M., and Fily, M. (2009). Simulation of Snow Water Equivalent (SWE) using Thermodynamic Snow Models in Québec, Canada. Journal of Hydrometeorology, 10(6), 1447-1462 DOI: 10.1175/2009JHM1154.1
  • Langlois, A., Fisico, T., Barber, D.G. and Papakyriakou, T.N. (2008) The response of snow thermophysical processes to the passage of a polar low-pressure system and its impact on in-situ passive microwave data: A case study. Journal of Geophysical Research, 113, C03S04, doi:10.1029/2007JC004197.
  • Langlois, A., Scharien, R., Geldsetzer T., Iacozza J., Barber D.G. and Yackel J. (2008) Estimation of Snow Water Equivalent over First-Year Sea Ice using AMSR-E and Surface Observations. Remote Sensing of Environment, 112, 3656-3667.
  • Langlois, A. and Barber, D.G. (2008) Advances in seasonal snow water equivalent (SWE) retrieval using in-situ passive microwave measurements over first-year sea ice. International Journal of Remote Sensing, 29, 16, 4781-4802.
  • Galley, R.J., Trachtenberg, M., Langlois, A., Barber D.G. and Shafai, L. (2008) Observations of geophysical and dielectric properties and ground penetrating radar signatures for discrimination of snow, sea ice and freshwater ice thickness. Cold Regions Science and Technology, 57, 29-38.
  • Langlois, A. and Barber, D.G. (2007) Passive Microwave Remote Sensing of Seasonal Snow Covered Sea Ice. Progress in Physical Geography, 31(6), 539-573, doi: 10.1177/0309133307087082.
  • Langlois, A., Barber, D.G., and Hwang, B.J. (2007) Development of a snow water equivalent algorithm using passive microwave data over first-year sea ice. Remote Sensing of Environment, vol. 106/1, p.75-88, doi:10.1016/j.rse.2006.07.018.
  • Langlois, A., Mundy, C.J., Barber, D.G. (2007) Overwintering Evolution of Geophysical and Electrical Properties of Snow Cover over First-Year Sea Ice. Hydrological Processes, vol. 21, 6, p. 705-716, doi: 10.1002/hyp.6407.