Oliver Sonnentag

Membre régulier
Biogéosciences atmosphériques en hautes latitudes

Professeur agrégé et Chaire de recherche du Canada en biogéosciences atmosphériques en hautes latitudes
Département de Géographie
Université de Montréal
C.P. 6128 Succ. Centre Ville
Montréal (Québec) Canada, H3C 3J7

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FORMATION

• 2008 PhD degree, University of Toronto, Department of Geography and Program in Planning, Toronto, Ontario, Canada
• 2003 MSc GIS degree, University of Salzburg, Department of Geoinformatics/UNIGIS, Salzburg, Austria
• 2001 Dipl. geol. degree, Karlsruhe Institute of Technology, Department of Applied Geology, Karlsruhe, Germany

THÈMES DE RECHERCHE

Mes principaux intérêts scientifiques portent sur la compréhension des altérations dans les interactions entre la biosphère et l'atmosphère en réponse aux changements environnementaux mondiaux, utilisant des mesures par exemple : des mesures de covariance des turbulences), la télédétection (satellite et près de la surface) et les techniques de modélisation. Je suis également intéressé par la mesure locale et la cartographie (régionale, mondiale) des paramètres biophysiques pour étudier les changements dans la structure, le fonctionnement et la phénologie des écosystèmes terrestres.

DISTINCTIONS REÇUES

• 2022 - Membre du Collège de nouveaux chercheurs et créateurs en arts et en science de la Société royale du Canada, qui comprend les meilleurs leaders en milieu de carrière du Canada.

PUBLICATIONS

Books

Book chapters

Edited books, special journal editions and proceedings

Peer-reviewed articles

1. Zona, D., Lafleur, P.M., Hufkens, K., Gioli, B., Bailey, B., Burba, G., Euskirchen, E.S., Watts, J.D., Arndt, K.A., Farina, M. et al. (2023) Pan-Arctic soil moisture control on tundra carbon sequestration and plant productivity. Global Change Biology, 29:1267-1281
2. Virkkala, A.-M., Natali, S.M., Rogers, B.M., Watts, J.D., Savage, K., Connon, S.J., Mauritz, M., Schuur, E.A.G., Peter, D., Minions, C. et al. (2022) The ABCflux database: Arctic-boreal CO2flux observations and ancillary information aggregated to monthly time steps across terrestrial ecosystems. Earth System Science Data, 14(1):179-208
3. Oehri, J., Schaepman-Strub, G., Kim, J.-S., Grysko, R., Kropp, H., Grunberg, I., Zemlianskii, V., Sonnentag, O., Euskirchen, E.S., Reji Chacko, M. et al. (2022) Vegetation type is an important predictor of the arctic summer land surface energy budget. Nature Communications, 13:6379
4. Zolkos, S., Tank, S., Kokelj, S., Striegl, R., Shakil, S., Voigt, C., Sonnentag, O., Quinton, W., Schuur, E., Zona, D. et al. (2022) Permafrost landscape history shapes fluvial chemistry, ecosystem carbon balance, and potential trajectories of future change. Global Biogeochemical Cycles, 36
5. Martin, M.R., Kumar, P., Sonnentag, O., Marsh, P. (2022) Thermodynamic basis for the demarcation of Arctic and alpine treelines. Scientific Reports, 12:12565
6. El-Amine, M., Roy, A., Koebsch, F., Baltzer, J.L., Barr, A., Black, A., Ikawa, H., Iwata, H., Kobayashi, H., Ueyama, M. et al. (2022) What explains the year-to-year variation in growing season timing of boreal black spruce forests? Agricultural and Forest Meteorology, 324:109113
7. Yuan, K., Zhu, Q., Li, F., Riley, W.J., Torn, M., Chu, H., McNicol, G., Chen, M., Knox, S., Delwiche, K. et al. (2022) Causality guided machine learning model on wetland CH4 emissions across global wetlands. Agricultural and Forest Meteorology, 324:109115
8. Dimitrov, D.D., Lafleur, P., Sonnentag, O., Talbot, J., Quinton, W.L. (2022) Hydrology of peat estimated from near-surface water contents. Hydrological Sciences Journal, 67:1702-1721
9. Foster, A.C., Wang, J.A., Frost, G.V., Davidson, S.J., Hoy, E., Turner, K.W., Sonnentag, O., Epstein, H., Berner, L.T., Armstrong, A.H. et al. (2022) Disturbances in North American boreal forest and Arctic tundra: impacts, interactions, and responses. Environmental Research Letters, 17:113001
10. Dutch, V.R., Rutter, N., Wake, L., Sandells, M., Derksen, C., Walker, B., Hould Gosselin, G., Sonnentag, O., Essery, R., Kelly, R. et al. (2022) Impact of measured and simulated tundra snowpack properties on heat transfer. The Cryosphere, 16:4201-4222
11. Cheng, R., Magney, T.S., Orcutt, E.L., Pierrat, Z., Kohler, P., Bowling, D.R., Bret-Harte, M.S., Euskirchen, E.S., Jung, M., Kobayashi, H. et al. (2022) Evaluating photosynthetic activity across Arctic-Boreal land cover types using solar-induced fluorescence. Environmental Research Letters, 17:115009
12. Nehemy, M.F., Maillet, J., Perron, N., Pappas, C., Sonnentag, O., Baltzer, J.L., Laroque, C.P., McDonnell, J.J. (2022) Snowmelt Water Use at Transpiration Onset: Phenology, Isotope Tracing, and Tree Water Transit Time. Water Resources Research, 58:e2022WR032344
13. Mousavi, S.M., Dinan, N.M., Ansarifard, S., Sonnentag, O. (2022) Analyzing spatio-temporal patterns in atmospheric carbon dioxide concentration across Iran from 2003 to 2020. Atmospheric Environment: X, 14:100163
14. Stimmler, P., Gockede, M., Natali, S.M., Sonnentag, O., Gilfedder, B.S., Perron, N., Schaller, J. (2022) The importance of calcium and amorphous silica for arctic soil CO2 production. Frontiers in Environmental Science, 10
15. Curasi, S.R., Fetcher, N., Hewitt, R.E., Lafleur, P.M., Loranty, M.M., Mack, M.C., May, J.L., Myers-Smith, I.H., Natali, S.M., Oberbauer, S.F. et al. (2022) Range shifts in a foundation sedge potentially induce large Arctic ecosystem carbon losses and gains. Environmental Research Letters, 17:045024
16. Chu, H., Luo, X., Ouyang, Z., Chan, W.S., Dengel, S., Biraud, S.C., Torn, M.S., Metzger, S., Kumar, J., Arain, M.A. et al. (2021) Representativeness of Eddy-Covariance flux footprints for areas surrounding AmeriFlux sites. Agricultural and Forest Meteorology, 301-302
17. Loisel, J., Gallego-Sala, A.V., Amesbury, M.J., Magnan, G., Anshari, G., Beilman, D.W., Benavides, J.C., Blewett, J., Camill, P., Charman, D.J. et al. (2021) Author Correction: Expert assessment of future vulnerability of the global peatland carbon sink (Nature Climate Change, (2021), 11, 1, (70-77), 10.1038/s41558-020-00944-0). Nature Climate Change, 11(4):362
18. Holtzman, N.M., Anderegg, L.D.L., Kraatz, S., Mavrovic, A., Sonnentag, O., Pappas, C., Cosh, M.H., Langlois, A., Lakhankar, T., Tesser, D. et al. (2021) L-band vegetation optical depth as an indicator of plant water potential in a temperate deciduous forest stand. Biogeosciences, 18(2):739-753
19. Kropp, H., Loranty, M.M., Natali, S.M., Kholodov, A.L., Rocha, A.V., Myers-Smith, I., Abbot, B.W., Abermann, J., Blanc-Betes, E., Blok, D. et al. (2021) Shallow soils are warmer under trees and tall shrubs across Arctic and Boreal ecosystems. Environmental Research Letters, 16(1)
20. Loisel, J., Gallego-Sala, A.V., Amesbury, M.J., Magnan, G., Anshari, G., Beilman, D.W., Benavides, J.C., Blewett, J., Camill, P., Charman, D.J. et al. (2021) Expert assessment of future vulnerability of the global peatland carbon sink. Nature Climate Change, 11(1):70-77
21. Chang, K.-Y., Riley, W.J., Knox, S.H., Jackson, R.B., McNicol, G., Poulter, B., Aurela, M., Baldocchi, D., Bansal, S., Bohrer, G. et al. (2021) Substantial hysteresis in emergent temperature sensitivity of global wetland CH4 emissions. Nature Communications, 12(1)
22. Knox, S.H., Bansal, S., McNicol, G., Schafer, K., Sturtevant, C., Ueyama, M., Valach, A.C., Baldocchi, D., Delwiche, K., Desai, A.R. et al. (2021) Identifying dominant environmental predictors of freshwater wetland methane fluxes across diurnal to seasonal time scales. Global Change Biology, 27(15):3582-3604
23. Pierrat, Z., Nehemy, M.F., Roy, A., Magney, T., Parazoo, N.C., Laroque, C., Pappas, C., Sonnentag, O., Grossmann, K., Bowling, D.R. et al. (2021) Tower-Based Remote Sensing Reveals Mechanisms Behind a Two-phased Spring Transition in a Mixed-Species Boreal Forest. Journal of Geophysical Research: Biogeosciences, 126(5)
24. Irvin, J., Zhou, S., McNicol, G., Lu, F., Liu, V., Fluet-Chouinard, E., Ouyang, Z., Knox, S.H., Lucas-Moffat, A., Trotta, C. et al. (2021) Gap-filling eddy covariance methane fluxes: Comparison of machine learning model predictions and uncertainties at FLUXNET-CH4 wetlands. Agricultural and Forest Meteorology, 308-309
25. Virkkala, A.-M., Aalto, J., Rogers, B.M., Tagesson, T., Treat, C.C., Natali, S.M., Watts, J.D., Potter, S., Lehtonen, A., Mauritz, M. et al. (2021) Statistical upscaling of ecosystem CO2 fluxes across the terrestrial tundra and boreal domain: Regional patterns and uncertainties. Global Change Biology, 27(17):4040-4059
26. Watts, J.D., Natali, S.M., Minions, C., Risk, D., Arndt, K., Zona, D., Euskirchen, E.S., Rocha, A.V., Sonnentag, O., Helbig, M. et al. (2021) Soil respiration strongly offsets carbon uptake in Alaska and Northwest Canada. Environmental Research Letters, 16(8)
27. Delwiche, K.B., Knox, S.H., Malhotra, A., Fluet-Chouinard, E., McNicol, G., Feron, S., Ouyang, Z., Papale, D., Trotta, C., Canfora, E. et al. (2021) FLUXNET-CH4: A global, multi-ecosystem dataset and analysis of methane seasonality from freshwater wetlands. Earth System Science Data, 13(7):3607-3689
28. Olefeldt, D., Hovemyr, M., Kuhn, M.A., Bastviken, D., Bohn, T.J., Connolly, J., Crill, P., Euskirchen, E.S., Finkelstein, S.A., Genet, H. et al. (2021) The boreal-arctic wetland and lake dataset (BAWLD). Earth System Science Data, 13(11):5127-5149
29. Connon, R.F., Chasmer, L., Haughton, E., Helbig, M., Hopkinson, C., Sonnentag, O., Quinton, W.L. (2021) The implications of permafrost thaw and land cover change on snow water equivalent accumulation, melt and runoff in discontinuous permafrost peatlands. Hydrological Processes, 35(9)
30. Wu, C., Wang, J., Ciais, P., Penuelas, J., Zhang, X., Sonnentag, O., Tian, F., Wang, X., Wang, H., Liu, R. et al. (2021) Widespread decline in winds delayed autumn foliar senescence over high latitudes. Proceedings of the National Academy of Sciences of the United States of America, 118(16)
31. Roy, A., Toose, P., Mavrovic, A., Pappas, C., Royer, A., Derksen, C., Berg, A., Rowlandson, T., El-Amine, M., Barr, A. et al. (2020) L-Band response to freeze/thaw in a boreal forest stand from ground- and tower-based radiometer observations. Remote Sensing of Environment, 237
32. Liu, Y., Wu, C., Sonnentag, O., Desai, A.R., Wang, J. (2020) Using the red chromatic coordinate to characterize the phenology of forest canopy photosynthesis. Agricultural and Forest Meteorology, 285-286
33. Wang, J.A., Sulla-Menashe, D., Woodcock, C.E., Sonnentag, O., Keeling, R.F., Friedl, M.A. (2020) Extensive land cover change across Arctic–Boreal Northwestern North America from disturbance and climate forcing. Global Change Biology, 26(2):807-822
34. Liu, Z., Kimball, J.S., Parazoo, N.C., Ballantyne, A.P., Wang, W.J., Madani, N., Pan, C.G., Watts, J.D., Reichle, R.H., Sonnentag, O. et al. (2020) Increased high-latitude photosynthetic carbon gain offset by respiration carbon loss during an anomalous warm winter to spring transition. Global Change Biology, 26(2):682-696
35. Koebsch, F., Sonnentag, O., Jarveoja, J., Peltoniemi, M., Alekseychik, P., Aurela, M., Arslan, A.N., Dinsmore, K., Gianelle, D., Helfter, C. et al. (2020) Refining the role of phenology in regulating gross ecosystem productivity across European peatlands. Global Change Biology, 26(2):876-887
36. Baltzer, J.L., Sonnentag, O. (2020) No beating around the bush: the impact of projected high-latitude vegetation transitions on soil and ecosystem respiration. New Phytologist, 227(6):1591-1593
37. Helbig, M., Waddington, J.M., Alekseychik, P., Amiro, B.D., Aurela, M., Barr, A.G., Black, T.A., Blanken, P.D., Carey, S.K., Chen, J. et al. (2020) Increasing contribution of peatlands to boreal evapotranspiration in a warming climate. Nature Climate Change, 10(6):555-560
38. Holtzman, N., Anderegg, L. D. L., Kraatz, S., Mavrovic, A., Sonnentag, O., Pappas, C., Cosh, M. H., Langlois, A., Lakhankar, T., Tesser, D. et al. (2020) L-band vegetation optical depth as an indicator of plant water potential in a temperate deciduous forest stand. Biogeosciences Discussions, 2020:1-26
39. Voigt, C., Marushchak, M.E., Abbott, B.W., Biasi, C., Elberling, B., Siciliano, S.D., Sonnentag, O., Stewart, K.J., Yang, Y., Martikainen, P.J. (2020) Nitrous oxide emissions from permafrost-affected soils. Nature Reviews Earth & Environment, 1(8):420-434
40. Pappas, C., Maillet, J., Rakowski, S., Baltzer, J.L., Barr, A.G., Black, T.A., Fatichi, S., Laroque, C.P., Matheny, A.M., Roy, A. et al. (2020) Aboveground tree growth is a minor and decoupled fraction of boreal forest carbon input. Agricultural and Forest Meteorology, 290
41. Helbig, M., Waddington, J.M., Alekseychik, P., Amiro, B., Aurela, M., Barr, A.G., Black, T.A., Carey, S.K., Chen, J., Chi, J. et al. (2020) The biophysical climate mitigation potential of boreal peatlands during the growing season. Environmental Research Letters, 15(10)
42. Stralberg, D., Arseneault, D., Baltzer, J.L., Barber, Q.E., Bayne, E.M., Boulanger, Y., Brown, C.D., Cooke, H.A., Devito, K., Edwards, J. et al. (2020) Climate-change refugia in boreal North America: what, where, and for how long? Frontiers in Ecology and the Environment, 18(5, SI):261-270
43. Natali, S.M., Watts, J.D., Rogers, B.M., Potter, S., Ludwig, S.M., Selbmann, A.-K., Sullivan, P.F., Abbott, B.W., Arndt, K.A., Birch, L. et al. (2019) Author Correction: Large loss of CO2 in winter observed across the northern permafrost region (Nature Climate Change, (2019), 9, 11, (852-857), 10.1038/s41558-019-0592-8). Nature Climate Change, 9(12):1005
44. Wilcox, E.J., Keim, D., de Jong, T., Walker, B., Sonnentag, O., Sniderhan, A.E., Mann, P., Marsh, P. (2019) Tundra shrub expansion may amplify permafrost thaw by advancing snowmelt timing. Arctic Science, 5(4):202-217
45. Natali, S.M., Watts, J.D., Rogers, B.M., Potter, S., Ludwig, S.M., Selbmann, A.-K., Sullivan, P.F., Abbott, B.W., Arndt, K.A., Birch, L. et al. (2019) Large loss of CO2 in winter observed across the northern permafrost region. Nature Climate Change, 9(11):852-857
46. Stone, L.E., Fang, X., Haynes, K.M., Helbig, M., Pomeroy, J.W., Sonnentag, O., Quinton, W.L. (2019) Modelling the effects of permafrost loss on discharge from a wetland-dominated, discontinuous permafrost basin. Hydrological Processes, 33(20):2607-2626
47. Peltola, O., Vesala, T., Gao, Y., Raty, O., Alekseychik, P., Aurela, M., Chojnicki, B., Desai, A.R., Dolman, A.J., Euskirchen, E.S. et al. (2019) Monthly gridded data product of northern wetland methane emissions based on upscaling eddy covariance observations. Earth System Science Data, 11(3):1263-1289
48. Quinton, W., Berg, A., Braverman, M., Carpino, O., Chasmer, L., Connon, R., Craig, J., Devoie, E., Hayashi, M., Haynes, K. et al. (2019) A synthesis of three decades of hydrological research at Scotty Creek, NWT, Canada. Hydrology and Earth System Sciences, 23(4):2015-2039
49. Eitel, J.U.H., Maguire, A.J., Boelman, N., Vierling, L.A., Griffin, K.L., Jensen, J., Magney, T.S., Mahoney, P.J., Meddens, A.J.H., Silva, C. et al. (2019) Proximal remote sensing of tree physiology at northern treeline: Do late-season changes in the photochemical reflectance index (PRI) respond to climate or photoperiod? Remote Sensing of Environment, 221:340-350
50. Gielen, B., Acosta, M., Altimir, N., Buchmann, N., Cescatti, A., Ceschia, E., Fleck, S., Hortnagl, L., Klumpp, K., Kolari, P. et al. (2018) Ancillary vegetation measurements at ICOS ecosystem stations. International Agrophysics, 32(4):645-664
51. Franz, D., Acosta, M., Altimir, N., Arriga, N., Arrouays, D., Aubinet, M., Aurela, M., Ayres, E., Lopez-Ballesteros, A., Barbaste, M. et al. (2018) Towards long-Term standardised carbon and greenhouse gas observations for monitoring Europe's terrestrial ecosystems: A review. International Agrophysics, 32(4):439-455
52. Loranty, M.M., Abbott, B.W., Blok, D., Douglas, T.A., Epstein, H.E., Forbes, B.C., Jones, B.M., Kholodov, A.L., Kropp, H., Malhotra, A. et al. (2018) Reviews and syntheses: Changing ecosystem influences on soil thermal regimes in northern high-latitude permafrost regions. Biogeosciences, 15(17):5287-5313
53. Pappas, C., Matheny, A.M., Baltzer, J.L., Barr, A.G., Black, T.A., Bohrer, G., Detto, M., Maillet, J., Roy, A., Sonnentag, O. et al. (2018) Boreal tree hydrodynamics: Asynchronous, diverging, yet complementary. Tree Physiology, 38(7):953-964
54. Peters, R.L., Fonti, P., Frank, D.C., Poyatos, R., Pappas, C., Kahmen, A., Carraro, V., Prendin, A.L., Schneider, L., Baltzer, J.L. et al. (2018) Quantification of uncertainties in conifer sap flow measured with the thermal dissipation method. New Phytologist, 219(4):1283-1299
55. Peichl, M., Gazovič, 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(1)
56. Pisek, J., Buddenbaum, H., Camacho, F., Hill, J., Jensen, J.L.R., Lange, H., Liu, Z., Piayda, A., Qu, Y., Roupsard, O. et al. (2018) Data synergy between leaf area index and clumping index Earth Observation products using photon recollision probability theory. Remote Sensing of Environment, 215:1-6
57. Mavrovic, A., Roy, A., 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
58. Fisher, J.B., Hayes, D.J., Schwalm, C.R., Huntzinger, D.N., Stofferahn, E., Schaefer, K., Luo, Y., Wullschleger, S.D., Goetz, S.J., Miller, C.E. et al. (2018) Missing pieces to modeling the Arctic-Boreal puzzle. Environmental Research Letters, 13(2):020202
59. Filippa, G., Cremonese, E., Migliavacca, M., Galvagno, M., Sonnentag, O., Humphreys, E., Hufkens, K., Ryu, Y., Verfaillie, J., Morra di Cella, U. et al. (2018) NDVI derived from near-infrared-enabled digital cameras: Applicability across different plant functional types. Agricultural and Forest Meteorology, 249:275-285
60. Warren, R.K., Pappas, C., Helbig, M., 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
61. Rapinski, M., Payette, F., Sonnentag, O., Herrmann, T.M., Royer, M.-J.S., Cuerrier, A., Siegwart Collier, L., Hermanutz, L., Guanish, G., Elders of Kawawachikamach et al. (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
62. Helbig, M., 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
63. Helbig, M., 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)
64. 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. Holocene, 27(9):1391-1405
65. Roy, A., 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)
66. Helbig, M., 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
67. Helbig, M., Pappas, C., Sonnentag, O. (2016) Permafrost thaw and wildfire: Equally important drivers of boreal tree cover changes in the Taiga Plains, Canada. Geophysical Research Letters, 43(4):1598-1606
68. Helbig, M., 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
69. Helbig, M., 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. et al. (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
70. Moore, C.E., Brown, T., Keenan, T.F., Duursma, R.A., Van Dijk, A.I.J.M., Beringer, J., Culvenor, D., Evans, B., Huete, A., Hutley, L.B. et al. (2016) Reviews and syntheses: Australian vegetation phenology: New insights from satellite remote sensing and digital repeat photography. Biogeosciences, 13(17):5085-5102
71. Brown, T.B., Hultine, K.R., Steltzer, H., Denny, E.G., Denslow, M.W., Granados, J., Henderson, S., Moore, D., Nagai, S., Sanclements, M. et al. (2016) Using phenocams to monitor our changing earth: Toward a global phenocam network. Frontiers in Ecology and the Environment, 14(2):84-93
72. Hwang, Y., Ryu, 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
73. 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(15):4577-4594
74. Garon-Labrecque, M.-E., Leveille-Bourret, E., 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
75. Toomey, M., Friedl, M.A., Frolking, S., Hufkens, K., Klosterman, S., Sonnentag, O., Baldocchi, D.D., Bernacchi, C.J., Biraud, S.C., Bohrer, G. et al. (2015) Greenness indices from digital cameras predict the timing and seasonal dynamics of canopy-scale photosynthesis. Ecological Applications, 25(1):99-115
76. 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
77. 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
78. 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
79. 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
80. Keenan, T.F., Darby, B., Felts, E., Sonnentag, O., Friedl, M.A., Hufkens, K., O'Keefe, J., Klosterman, S., Munger, J.W., Toomey, M. et al. (2014) Tracking forest phenology and seasonal physiology using digital repeat photography: A critical assessment. Ecological Applications, 24(6):1478-1489
81. Klosterman, S.T., Hufkens, K., Gray, J.M., Melaas, E., Sonnentag, O., Lavine, I., Mitchell, L., Norman, R., Friedl, M.A., Richardson, A.D. (2014) Evaluating remote sensing of deciduous forest phenology at multiple spatial scales using PhenoCam imagery. Biogeosciences, 11(16):4305-4320
82. Peichl, M., Sonnentag, O., Nilsson, M.B. (2014) Bringing Color into the Picture: Using Digital Repeat Photography to Investigate Phenology Controls of the Carbon Dioxide Exchange in a Boreal Mire. Ecosystems, 18(1):115-131
83. Macfarlane, C., Ryu, Y., Ogden, G.N., Sonnentag, O. (2014) Digital canopy photography: Exposed and in the raw. Agricultural and Forest Meteorology, 197:244-253
84. Peichl, M., Sonnentag, O., Wohlfahrt, G., Flanagan, L.B., Baldocchi, D.D., Kiely, G., Galvagno, M., Gianelle, D., Marcolla, B., Pio, C. et al. (2013) Convergence of potential net ecosystem production among contrasting C3 grasslands. Ecology Letters, 16(4):502-512
85. Pisek, J., Sonnentag, O., Richardson, A.D., Mottus, M. (2013) Is the spherical leaf inclination angle distribution a valid assumption for temperate and boreal broadleaf tree species? Agricultural and Forest Meteorology, 169:186-194
86. Richardson, A.D., Keenan, T.F., Migliavacca, M., Ryu, Y., Sonnentag, O., Toomey, M. (2013) Climate change, phenology, and phenological control of vegetation feedbacks to the climate system. Agricultural and Forest Meteorology, 169:156-173
87. 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. Climatic Change, 119(3-4):719-732
88. 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
89. Vargas, R., Sonnentag, O., Abramowitz, G., Carrara, A., Chen, J.M., Ciais, P., Correia, A., Keenan, T.F., Kobayashi, H., Ourcival, J.-M. et al. (2013) Drought Influences the Accuracy of Simulated Ecosystem Fluxes: A Model-Data Meta-analysis for Mediterranean Oak Woodlands. Ecosystems, 16(5):749-764
90. Ryu, Y., Verfaillie, J., Macfarlane, C., Kobayashi, H., Sonnentag, O., Vargas, R., Ma, S., Baldocchi, D.D. (2012) Continuous observation of tree leaf area index at ecosystem scale using upward-pointing digital cameras. Remote Sensing of Environment, 126:116-125
91. Hufkens, K., Friedl, M.A., Keenan, T.F., Sonnentag, O., Bailey, A., O'Keefe, J., Richardson, A.D. (2012) Ecological impacts of a widespread frost event following early spring leaf-out. Global Change Biology, 18(7):2365-2377
92. Migliavacca, M., Sonnentag, O., Keenan, T.F., Cescatti, A., O'Keefe, J., Richardson, A.D. (2012) On the uncertainty of phenological responses to climate change, and implications for a terrestrial biosphere model. Biogeosciences, 9(6):2063-2083
93. Hatala, J.A., Detto, M., Sonnentag, O., Deverel, S.J., Verfaillie, J., Baldocchi, D.D. (2012) Greenhouse gas (CO 2, CH 4, H 2O) fluxes from drained and flooded agricultural peatlands in the Sacramento-San Joaquin Delta. Agriculture, Ecosystems and Environment, 150:1-18
94. Hufkens, K., Friedl, M., Sonnentag, O., Braswell, B.H., Milliman, T., Richardson, A.D. (2012) Linking near-surface and satellite remote sensing measurements of deciduous broadleaf forest phenology. Remote Sensing of Environment, 117:307-321
95. Baldocchi, D., Detto, M., Sonnentag, O., Verfaillie, J., Teh, Y.A., Silver, W., Kelly, N.M. (2012) The challenges of measuring methane fluxes and concentrations over a peatland pasture. Agricultural and Forest Meteorology, 153:177-187
96. Sonnentag, O., Hufkens, K., Teshera-Sterne, C., Young, A.M., Friedl, M., Braswell, B.H., Milliman, T., O'Keefe, J., Richardson, A.D. (2012) Digital repeat photography for phenological research in forest ecosystems. Agricultural and Forest Meteorology, 152(1):159-177
97. Sonnentag, O., Detto, M., Runkle, B.R.K., Teh, Y.A., Silver, W.L., Kelly, M., Baldocchi, D.D. (2011) Carbon dioxide exchange of a pepperweed (Lepidium latifolium L.) infestation: How do flowering and mowing affect canopy photosynthesis and autotrophic respiration? Journal of Geophysical Research: Biogeosciences, 116(1)
98. Teh, Y.A., Silver, W.L., Sonnentag, O., Detto, M., Kelly, M., Baldocchi, D.D. (2011) Large Greenhouse Gas Emissions from a Temperate Peatland Pasture. Ecosystems, 14(2):311-325
99. Migliavacca, M., Galvagno, M., Cremonese, E., Rossini, M., Meroni, M., Sonnentag, O., Cogliati, S., Manca, G., Diotri, F., Busetto, L. et al. (2011) Using digital repeat photography and eddy covariance data to model grassland phenology and photosynthetic CO2 uptake. Agricultural and Forest Meteorology, 151(10):1325-1337
100. Sonnentag, O., Detto, M., Vargas, R., Ryu, Y., Runkle, B.R.K., Kelly, M., Baldocchi, D.D. (2011) Tracking the structural and functional development of a perennial pepperweed (Lepidium latifolium L.) infestation using a multi-year archive of webcam imagery and eddy covariance measurements. Agricultural and Forest Meteorology, 151(7):916-926
101. Govind, A., Chen, J.M., Mcdonnell, J., Kumari, J., Sonnentag, O. (2011) Effects of lateral hydrological processes on photosynthesis and evapotranspiration in a boreal ecosystem. Ecohydrology, 4(3):394-410
102. Sulman, B.N., Desai, A.R., Saliendra, N.Z., Lafleur, P.M., Flanagan, L.B., Sonnentag, O., MacKay, D.S., Barr, A.G., Van Der Kamp, G. (2010) CO2 fluxes at northern fens and bogs have opposite responses to inter-annual fluctuations in water table. Geophysical Research Letters, 37(19)
103. Pisek, J., Chen, J.M., Lacaze, R., Sonnentag, O., Alikas, K. (2010) Expanding global mapping of the foliage clumping index with multi-angular POLDER three measurements: Evaluation and topographic compensation. ISPRS Journal of Photogrammetry and Remote Sensing, 65(4):341-346
104. Sonnentag, O., van der Kamp, G., Barr, A.G., Chen, J.M. (2010) On the relationship between water table depth and water vapor and carbon dioxide fluxes in a minerotrophic fen. Global Change Biology, 16(6):1762-1776
105. Ryu, Y., Nilson, T., Kobayashi, H., Sonnentag, O., Law, B.E., Baldocchi, D.D. (2010) On the correct estimation of effective leaf area index: Does it reveal information on clumping effects? Agricultural and Forest Meteorology, 150(3):463-472
106. Ryu, Y., Sonnentag, O., Nilson, T., Vargas, R., Kobayashi, H., Wenk, R., Baldocchi, D.D. (2010) How to quantify tree leaf area index in an open savanna ecosystem: A multi-instrument and multi-model approach. Agricultural and Forest Meteorology, 150(1):63-76
107. Ryu, Y., Baldocchi, D.D., Verfaillie, J., Ma, S., Falk, M., Ruiz-Mercado, I., Hehn, T., Sonnentag, O. (2010) Testing the performance of a novel spectral reflectance sensor, built with light emitting diodes (LEDs), to monitor ecosystem metabolism, structure and function. Agricultural and Forest Meteorology, 150(12):1597-1606
108. Govind, A., Chen, J.M., Margolis, H., Ju, W., Sonnentag, O., Giasson, M.-A. (2009) A spatially explicit hydro-ecological modeling framework (BEPS-TerrainLab V2.0): Model description and test in a boreal ecosystem in Eastern North America. Journal of Hydrology, 367(3-4):200-216
109. Govind, A., Chen, J.M., Margolis, H.A., Ju, W., Sonnentag, O., Giasson, M.-A. (2009) A spatially explicit hydro-ecological modeling framework (BEPS-TerrainLab V2.0): Model description and test in a boreal ecosystem in Eastern North America. Journal of Hydrology, 367(3-4):200-216
110. Sonnentag, O., Chen, J.M., Roberts, D.A., Talbot, J., Halligan, K.Q., Govind, A. (2008) Corrigendum to "Mapping tree and shrub leaf area indices in an ombrotrophic peatland through multiple endmember spectral unmixing" [Remote Sensing of Environment, 109: 342-360] (DOI:10.1016/j.rse.2007.01.010). Remote Sensing of Environment, 112(7):3295
111. Sonnentag, O., Chen, J.M., Roulet, N.T., Ju, W., Govind, A. (2008) Spatially explicit simulation of peatland hydrology and carbon dioxide exchage: Influence of mesoscale topography. Journal of Geophysical Research: Biogeosciences, 113(2)
112. Sonnentag, O., Chen, J.M., Roberts, D.A., Talbot, J., Halligan, K.Q., Govind, A. (2007) Mapping tree and shrub leaf area indices in an ombrotrophic peatland through multiple endmember spectral unmixing. Remote Sensing of Environment, 109(3):342-360
113. Sonnentag, O., Talbot, J., Chen, J.M., Roulet, N.T. (2007) Using direct and indirect measurements of leaf area index to characterize the shrub canopy in an ombrotrophic peatland. Agricultural and Forest Meteorology, 144(3-4):200-212
114. Chen, J.M., Govind, A., Sonnentag, O., Zhang, Y., Barr, A., Amiro, B. (2006) Leaf area index measurements at Fluxnet-Canada forest sites. Agricultural and Forest Meteorology, 140(1-4):257-268

Articles published in proceedings

1. Roy, A., Toose, P., Mavrovic, A., Pappas, C., Berg, A., Rowlandson, T., Derksen, C., Royer, A., El-Amine, M., Helgason, W. et al. (2018) Use of L-band ground-based radiometers for freeze/thaw retrieval in a boreal forest site. In International Geoscience and Remote Sensing Symposium (IGARSS). Pages 9042-9044
2. Pisek, J., Buddenbaum, H., Camacho, F., Hill, J., Jensen, J.L.R., Lange, H., Liu, Z., Piayda, A., Qu, Y., Roupsard, O. et al. (2018) Application of photon recollision probability theory for compatibility check between foliage clumping and leaf area index products obtained from earth observation data. In International Geoscience and Remote Sensing Symposium (IGARSS). Pages 5918-5920
3. Roy, A., Royer, A., Derksen, C., Langlois, A., Sonnentag, O. (2016) Monitoring boreal and arctic freeze/thaw with the first year of SMAP brightness temperatures. In 14th Specialist Meeting on Microwave Radiometry and Remote Sensing of the Environment, MicroRad 2016 - Proceedings. Pages 82-84
4. Roy, A., Toose, P., Derksen, C., Royer, A., Mavrovic, A., Berg, A.A., Arnold, L., Willamson, M., Rowlandson, T., Lemmetyinen, J. et al. (2016) Analysis of L-Band brightness temperatures response to freeze/thaw in two prairie environments from surface-based radiometer measurements. In International Geoscience and Remote Sensing Symposium (IGARSS). Pages 1667-1670

Scientific reports, manuals and others

1. Op de Beeck, M., Gielen, B., Merbold, L., Sonnentag, O. (2016) Ancillary vegetation measurements in grasslands. Technical report, Integrated Carbon Observation System Ecosystem Thematic Centre, Helsinki, Finland.

Theses, dissertations and essays

Supervised theses, dissertations and essays

1. El-Amine, M. (2020) Contrôles environnementaux de la variabilité interannuelle de la reprise et de la fin de la photosynthèse au sein de la forêt boréale nord-américaine. Master's thesis, Université de Montréal
2. Helbig, M. (2017) Thawing permafrost and land-atmosphere interactions of boreal forest-wetland landscapes in northwestern Canada. PhD thesis, Université de Montréal
3. Higgins, K.L. (2015) Effet de la végétation sur la variabilité de la profondeur de dégel à petite échelle dans un paysage de tourbières en forêt boréale dans les Territoires du Nord-Ouest. Master's thesis, Université de Montréal
4. Payette, F. (2015) Échanges d’énergie et d’eau des écosystèmes nordiques dans un contexte de changement climatique. Master's thesis, Université de Montréal

Non peer-reviewed articles

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