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Oliver Sonnentag


Membre régulier

Département de géographie, Université de Montréal

Université de Montréal 520, chemin de la Côte-Ste-Catherine
Université de Montréal
Québec, Canada
H2V 2B8





Étudiants / Chercheurs postdoctoraux au CEN

Hurkuck, Miriam (Post-Doctorat). Un méso-réseau des tours de covariance des turbulences à travers des Territoires du Nord-Ouest pour évaluer des flux de carbone, d’eau et d’énergie en haute latitude sous des pressions croissantes.

Pappas, Christoforos (Post-Doctorat). Traits fonctionnels des plantes et leurs variabilités le long d’un gradient latitudinal climatique et de pergélisol dans l’écozone de la forêt boréale canadienne.

Qu, Bo (Doctorat). Assimilation de données satellitaires micro-ondes passives dans un modèle écosystémique pour l’amélioration des estimations de productivité de la forêt boréale au Canada.


Thèses et mémoires récents

Helbig, Manuel J., 2017 (Doctorat). Le dégel du pergélisol et les interactions entre végétation-atmosphère dans les paysages boréaux du nord-ouest du Canada.


Communications scientifiques

Filippa, G., Cremonese, E., Migliavacca, M., Galvagno, M., Sonnentag, O., Humphreys, E., Hufkens, K., Ryu, Y., Vervaillie, J., Morra di Cella, U., Richardson, A.D., 2018. NDVI derived from near-infrared-enabled digital cameras: Applicability across different plant functional types. Agricultural and Forest Meteorology, 249: 275-285. DOI: 10.1016/j.agrformet.2017.11.003.

Fisher, J.B., Hayes, D.J., Schwalm, C.R., Huntzinger, D.N., Stofferahn, E., Schaefer, K., Luo, Y., Wullschleger, S.D., Goetz, S., Miller, C.E., Griffith, P., Chadburn, S., Chatterjee, A., Ciais, P., Douglas, T.A., Genet, H., Ito, A., Neigh, S.R., Poulter, B., Rogers, B.M., Sonnentag, O., Tian, H., Wang, W., Xue, Y., Yang, Z.-L., Zeng, N., Zhang, Z., 2018. Missing pieces to modeling the Arctic-Boreal puzzle. Environmental Research Letters, 13(2): 020202. DOI: 10.1088/1748-9326/aa9d9a.

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.

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.

Peichl, M., Gažovič, M., Vermeij, I., de Goede, E., Sonnentag, O., Limpens, J., Nilsson, M.B., 2018. Peatland vegetation composition and phenology drive the seasonal trajectory of maximum gross primary production. Scientific Reports, 8. Article #8012. DOI: 10.1038/s41598-018-26147-4.

Peters, R.L., Fonti, P., Frank, D.C., Poyatos, R., Pappas, C., Kahmen, A., Carraro, V., Prendin, A.L., Schneider, L., Baltzer, J.L., Baron-Gafford, G.A., Dietrich, L., Heinrich, I., Minor, R.L., Sonnentag, O., Matheny, A.M., Wightman, M.G., Steppe, K., 2018. Quantification of uncertainties in conifer sap flow measured with the thermal dissipation method. New Phytologist, 219(4): 1283-1299. DOI: 10.1111/nph.15241.

Rapinski, M., Payette, F., Sonnentag, O., Herrmann, T.M., Royer, M.-J.S., Siegwart Collier, L., Hermanutz, L., Guanish, G., Elders of Kawawachikamach,., Elders of Kangiqsualujjuaq,., Elders of Nain,., 2018. Listening to Inuit and Naskapi peoples in the eastern Canadian Subarctic: a quantitative comparison of local observations with gridded climate data. Regional Environmental Change, 18(1): 189-203. DOI: 10.1007/s10113-017-1188-3.

Warren, R.K., Pappas, C., Helbig, M.J., Chasmer, L.E., Berg, A.A., Baltzer, J.L., Quinton, W.L., Sonnentag, O., 2018. Minor contribution of overstorey transpiration to landscape evapotranspiration in boreal permafrost peatlands. Ecohydrology, 11(5): e1975. DOI: 10.1002/eco.1975.

Helbig, M.J., Chasmer, L.E., Desai, A.R., Kljun, N., Quinton, W.L., Sonnentag, O., 2017. Direct and indirect climate change effects on carbon dioxide fluxes in a thawing boreal forest–wetland landscape. Global Change Biology, 23(8): 3231–3248. DOI: 10.1111/gcb.13638.

Helbig, M.J., Chasmer, L.E., Kljun, N., Quinton, W.L., Treat, C.C., Sonnentag, O., 2017. The positive net radiative greenhouse gas forcing of increasing methane emissions from a thawing boreal forest-wetland landscape. Global Change Biology, 23(6): 2413-2427. DOI: 10.1111/gcb.13520.

Helbig, M.J., Quinton, W.L., Sonnentag, O., 2017. Warmer spring conditions increase annual methane emissions from a boreal peat landscape with sporadic permafrost. Environmental Research Letters, 12(11): 115009. DOI: 10.1088/1748-9326/aa8c85.

Pelletier, N., Talbot, J., Olefeldt, D., Turetsky, M., Blodau, C., Sonnentag, O., Quinton, W.L., 2017. Influence of Holocene permafrost aggradation and thaw on the paleoecology and carbon storage of a peatland complex in northwestern Canada. The Holocene, 27(9): 1391-1405. DOI: 10.1177/0959683617693899.

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.

Brown, T.B., Hultine, K.R., Steltzer, H., Denny, E.G., Denslow, M.W., Granados, J., Henderson, S., Moore, D., Nagai, S., SanClements, M., Sánchez-Azofeifa, A., Sonnentag, O., Tazik, D., Richardson, A.D., 2016. Using phenocams to monitor our changing Earth: toward a global phenocam network. Frontiers in Ecology and the Environment, 14(2): 84-93. DOI: 10.1002/fee.1222.

Helbig, M.J., Pappas, C., Sonnentag, O., 2016. Permafrost thaw and wildfire: equally important drivers of boreal tree cover changes across the Taiga Plains, Canada. Geophysical Research Letters, 43(4): 1598-1606. DOI: 10.1002/2015GL067193.

Helbig, M.J., Wischnewski, K., Gosselin, G.H., Biraud, S.C., Bogoev, I., Chan, W.S., Euskirchen, E.S., Glenn, A.J., Marsh, P.M., Quinton, W.L., Sonnentag, O., 2016. Addressing a systematic bias in carbon dioxide flux measurements with the EC150 and the IRGASON open-path gas analyzers. Agricultural and Forest Meteorology, 228-229: 349-359. DOI: 10.1016/j.agrformet.2016.07.018.

Helbig, M.J., Wischnewski, K., Kljun, N., Chasmer, L.E., Quinton, W.L., Detto, M., Sonnentag, O., 2016. Regional atmospheric cooling and wetting effect of permafrost thaw-induced boreal forest loss. Global Change Biology, 22(12): 4048-4066. DOI: 10.1111/gcb.13348.

Hwang, Y., Ryua, Y., Kimm, H., Jiang, C., Lang, M., Macfarlane, C., Sonnentag, O., 2016. Correction for light scattering combined with sub-pixel classification improves estimation of gap fraction from digital cover photography. Agricultural and Forest Meteorology, 222: 32-44. DOI: 10.1016/j.agrformet.2016.03.008.

Moore, C.E., Brown, T.B., Keenan, T.F., Duursma, R.A., van Dijk, A.I.J.M., Beringer, J., Culvenor, D., Evans, B., Huete, A., Hutley, L.B., Maier, S., Restrepo-Coupe, N., Sonnentag, O., Specht, A., Taylor, J.R., van Gorsel, E., Liddell, M.J., 2016. Reviews and syntheses: Australian vegetation phenology: new insights from satellite remote sensing and digital repeat photography. Biogeosciences, 13: 5085-5102. DOI: 10.5194/bg-13-5085-2016.

Connon, R.F., Quinton, W.L., Craig, J.R., Hanisch, J., Sonnentag, O., 2015. The hydrology of interconnected bog complexes in discontinuous permafrost terrains. Hydrological Processes, 29(18): 3831-3847. DOI: 10.1002/hyp.10604.

Detto, M., Asner, G.P., Muller-Landau, H.C., Sonnentag, O., 2015. Spatial variability in tropical forest leaf area density from multireturn lidar and modeling. Journal of Geophysical Research - Biogeosciences, 120(2): 294-309. DOI: 10.1002/2014JG002774.

Garon-Labrecque, M.-È., Léveillé-Bourret, É., Higgins, K., Sonnentag, O., 2015. Additions to the boreal flora of the Northwest Territories with a preliminary vascular flora of Scotty Creek. The Canadian Field-Naturalist, 129(4): 349-367. DOI: 10.22621/cfn.v129i4.1757.

Matthes, J.H., Knox, S.H., Sturtevant, C., Sonnentag, O., Verfaillie, J., Baldocchi, D., 2015. Predicting landscape-scale CO2 flux at a pasture and rice paddy with long-term hyperspectral canopy reflectance measurements. Biogeosciences, 12: 4577-4594. DOI: 10.5194/bg-12-4577-2015.

Peichl, M., Sonnentag, O., Nilsson, M.B., 2015. Bringing color into the picture: using digital repeat photography to investigate phenology controls of the carbon dioxide exchange in a boreal mire. Ecosystems, 18: 115-131. DOI: 10.1007/s10021-014-9815-z.

Raabe, K., Pisek, J., Sonnentag, O., Annuk, K., 2015. Variations of leaf inclination angle distribution with height over the growing season and light exposure for eight broadleaf tree species. Agricultural and Forest Meteorology, 214-215: 2-11. DOI: 10.1016/j.agrformet.2015.07.008.

Toomey, M., Friedl, M.A., Frolking, S., Hufkens, K., Klosterman, S., Sonnentag, O., Baldocchi, D., Bernacchi, C., Biraud, S.C., Bohrer, G., Brzostek, E., Burns, S.P., Coursolle, C., Hollinger, D., Margolis, H., McCaughey, H., Monson, R.K., Munger, W.J., Pallardy, S., Phillips, R.P., Torn, M.S., Wharton, S., Zeri, M., Richardson, A.D., 2015. Greenness indices from digital cameras predict the timing and seasonal dynamics of canopy-scale photosynthesis. Ecological Applications, 25(1): 99-115. DOI: 10.1890/14-0005.1.

Talbot, J., Roulet, N.T., Sonnentag, O., Moore, T.R., 2014. Increases in aboveground biomass and leaf area 85 years after drainage in a bog. Botany, 92(10): 713-721. DOI: 10.1139/cjb-2013-0319.

Kross, A., Seaquist, J.W., Roulet, N.T., Fernandes, R., Sonnentag, O., 2013. Estimating carbon dioxide exchange rates at contrasting northern peatlands using MODIS satellite data. Remote Sensing of Environment, 137: 234-243. DOI: 10.1016/j.rse.2013.06.014.

Royer, M.-J.S., Herrmann, T.M., Sonnentag, O., Fortier, D., Delusca, K., Cuciurean, R., 2013. Linking Cree hunters' and scientific observations of changing inland ice and meteorological conditions in the subarctic eastern James Bay region, Canada. Climate Change, 119(3): 719-732. DOI: 10.1007/s10584-013-0773-9.

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