Sélectionnez une année pour visualiser les publications.

  1. Chen, J.M., Govind, A., Sonnentag, O., Zhang, Y., Barr, A.G., Amiro, B. (2006), Leaf area index measurements at Fluxnet-Canada forest sites. Agricultural and Forest Meteorology, 140, 257-268.
  1. Sonnentag, O., Talbot, J., Chen, J.M., Roulet, T.N. (2007), Using direct and indirect measurements of leaf area index to characterize the shrub canopy of an ombrotrophic peatland. Agricultural and Forest Meteorology, 144, 200-212.
  2. Sonnentag, O., Chen, J.M., Roberts, D.A., Talbot, J., Govind, A., Halligan, K. (2007), Mapping tree and shrub leaf area indices in an ombrotrophic peatland using eld measurements and multiple endmember spectral mixture analysis. Remote Sensing of Environment, 109, 342-360.
  1. Sonnentag, O., Chen, J.M., Roulet, N.T., Ju, W., Govind, A. (2008), Spatially explicit simulation of peatland hydrology and carbon dioxide exchange: Influence of mesoscale topography. Journal of Geophysical Research-Biogeosciences, 113, G02005.
  1. El Maayar, M., Sonnentag, O. (2009), Crop model validation and sensitivity to climate change scenarios. Climate Research, 39, 47-59.
  2. Govind, A., Chen, J.M., Margolis, H., Ju, W., Sonnentag, O., Giasson, M.-A. (2009), A spatially explicit hydroecological-modeling framework (BEPS-TerrainLab v2.0): Model description and test in a boreal ecosystem in Eastern North America. Journal of Hydrology, 367, 200-216.
  1. 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, 1597-1606.
  2. Sulman, B.N., Desai, A., Saliendra, N., Lafleur, P. Flanagan, L.B., Sonnentag, O., Mackay, D.S., Barr, A.G., van der Kamp, G. (2010), CO2fluxes at northern fens and bogs have opposite responses to inter-annual fluctuations in water table. Geophysical Research Letters, 37, L19702.
  3. 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, 1762-1776.
  4. Ryu, Y., Nilson, T., Kobayashi, H., Sonnentag, O., Law, B., 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, 463-472.
  5. Pisek, J., Chen, J.M., Lacaze, R., Sonnentag, O., Alikas, K. (2010), Refining global mapping of clumping index with multi-angular POLDER 3 measurements: topographic correction and evaluation. ISPRS Journal of Photogrammetry and Remote Sensing, 65, 341-345.
  6. Ryu, Y., Sonnentag, O., Nilson, T., Vargas, R., Kobayashi, H., Baldocchi, D.D. (2010), How to quantify tree leaf area index in savannas? A multi-instrument and multi-model approach. Agricultural and Forest Meteorology, 150, 63-76.
  1. Migliavacca, M., Galvagno, M., Cremonese, E., Rossini, M., Meroni, M., Sonnentag, O., et al., (2011), Using digital repeat photography and eddy covariance data to model grassland phenology and photosynthetic CO2 uptake. Agricultural and Forest Meteorology, 151, 1325-1337.
  2. Helbig, M., de Freitas, C.R., Matzarakis, A. (2011): Derivation of a climatic dataset for water balance modelling of Pacific atolls. Meteorologische Zeitschrift, 20, 565-570.
  3. Sonnentag, O., Detto, M., Ryu, Y., Vargas, R., Runkle, B., 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, 916-926.
  4. Teh, Y., Silver, W., Sonnentag, O., Detto, M., Kelly, M.,Baldocchi, D.D. (2011), Large greenhouse gas emissions from a temperate peatland pasture. Ecosystems, 14, 311-325.
  5. 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, 394-410.
  6. Sonnentag, O., Detto, M., Runkle, B., Teh, YA., Silver, W., Kelly, M., Baldocchi, D.D. (2011), Carbon dioxide exchange of a pepperweed (Lepidium latifolium L.) infestation: how do flowering and mowing aect canopy photosynthesis and autotrophic respiration? Journal of Geophysical Research-Biogeosciences, 113, G02005.
  1. Ryu, Y., Verfaillie, J., MacFarlane, C., Kobayashi, H., Sonnentag, O., Vargas, R., Ma, S., Baldocchi, D.D. (2012), A new approach for continuous observation of leaf area index at ecosystem scale using upward-pointing digital cameras. Remote Sensing of Environment, 126, 116-125.
  2. Sonnentag, O., Hufkens, K., Teshera-Sterne, C., Young, A.M., Friedl, M.A., Braswell, B.H., Miliman, T., O’Keefe, J., Richardson, A.D. (2012), Digital repeat photography for phenological research in forest ecosystems. Agricultural and Forest Meteorology, 152, 159-177.
  3. Hufkens, K., Richardson, A.D., Friedl, M.A., Keenan, T.F., Sonnentag, O., Bailey, A., O’Keefe, J. (2012), Ecological impacts of a widespread frost event following early spring leaf-out. Global Change Biology, 18, 2365-2377.
  4. Migliavacca, M., Sonnentag, O., Keenan, T.F., Cescatti, A., O’Keefe, O., Richardson, A.D. (2012), On the uncertainty of phenological responses to climate change, and implications for a terrestrial biosphere model. Biogeosciences, 9, 2063-2083.
  5. Hatala, J.A., Detto, M., Sonnentag, O., Deverel, S.J., Verfaillie, J., Baldocchi, D.D. (2012), Greenhouse gas fluxes from drained and  flooded agricultural peatlands in the Sacramento-San Joaquin Delta. Agricultural, Ecosystems and Environment, 115, 1-18.
  6. Baldocchi, D.D., Detto, M., Sonnentag, O., Verfaillie, J., Teh, Y., Silver, W., Kelly, M. (2012), The challenges of measuring methane  fluxes and concentrations over a peatland pasture. Agricultural and Forest Meteorology, 153, 177-187.
  7. Hufkens, K., Richardson, A.D., Sonnentag, O., Braswell, B.H., Miliman, T., Friedl, M.A. (2012), Linking near-surface and satellite remote sensing measurements of deciduous broadleaf phenology. Remote Sensing of Environment, 117, 30-321.
  1. Kross, A., Seaquist, J.W., Roulet, N.T., Fernandes, R., Sonnentag, O. (2013), Estimating carbon dioxide exchange rates of contrasting northern peatlands using MODIS satellite data. Remote Sensing of Environment, 137, 234-243.
  2. de Freitas, C. R., Helbig, M., Matzarakis, A. (2013): Hydroclimatic assessment of water resources of low Pacific islands: evaluating sensitivity to climatic change and variability. International Journal of Climatology, doi: 10.1002/joc.3731.
  3. Royer, M.-J.S., Herrmann, T.M., Sonnentag, O., Delusca, K., Fortier, D. (2013), Linking Cree hunters’ and scientific observations of changing inland ice and meteorological conditions in the subarctic Eastern James Bay region, Canada. Climatic Change, 199, 719-732.
  4. Peichl, M., Sonnentag, O., Wohlfahrt, G., Baldocchi, D.D., Flanagan, L.B., Kiely, G., Galvagno, M., Gianelle, D., Marcolla, B., Pio, C., Migliavacca, M., Jones, M.B., Saunders, M. (2013), Convergence of potential net ecosystem production across contrasting C3 grasslands. Ecology Letters 16, 502-512.
  5. Vargas, R., Sonnentag, O., Abramowitz, G., Carrara, A., Correia, A., Kobayashi, D., Papale, D., Pearson, J., Pereira, S., Piao, S., Rambal, S., Baldocchi, D.D. (2013), Drought influences the accuracy of simulated ecosystem fluxes: a model-data meta-analysis for Mediterranean oak woodlands. Ecosystems, 16: 749-764.
  6. Pisek, J., Sonnentag, O., Richardson, A.D., Mottus, M. (2013), Is the spherical leaf inclination angle distribution a valid assumption for temperate and boreal tree species? Agricultural and Forest Meteorology, 169, 186-194. Shared lead authorship between J. Pisek and O. Sonnentag.
  7. Richardson, A.D., Keenan, T., 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. Invited review.
  8. Boike, J., Kattenstroth, B., Abramova, K., Bornemann, N., Chetverova, A., Fedorova, I., Fröb, K., Grigoriev, M., Grüber, M., Kutzbach, L., Langer, M., Minke, M., Muster, S., Piel, K., Pfeiffer, E. M., Stoof, G., Westermann, S., Wischnewski, K., Wille, C. and Hubberten, H. W. (2013), Baseline characteristics of climate, permafrost and land cover from a new permafrost observatory in the Lena River Delta, Siberia (1998-2011). Biogeosciences, 10, 2105-2128.
  9. Helbig, M., Boike, J., Langer, M., Schreiber, P., Runkle, B., Kutzbach, L. (2013): Spatial and seasonal variability of polygonal tundra water balance, Lena River Delta, northern Siberia. Hydrogeology Journal, 21, 133-147.
  1. 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.
  2. 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.
  3. Keenan, T.F., Darby, B., Felts, E., Sonnentag, O., Friedl, M.A,, Hufkens, K., O’Keefe, J., Klosterman, S., Munger, J.W., Toomey, M., Richardson, A.D. (2014), Tracking forest phenology and seasonal physiology using digital repeat photography. Ecological Applications, 24, 1478-1489.
  4. Macfarlane, C., Ryu, Y., Odgen, G.N., Sonnentag, O. (2014), Digital camera photography: exposed and in the raw. Agricultural and Forest Meteorology, 197, 244-253.
  5. Klosterman, S.T., Hufkens, K., Gray, J., 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, 4305-4320.
  6. Yi, S., Wischnewski, K., Langer, M., Muster, S. and Boike, J. (2014), Freeze/thaw processes in complex permafrost landscapes of northern Siberia simulated using the TEM ecosystem model: impact of thermokarst ponds and lakes. Geoscientific Model Development7,1671-1689.
  1. Connon, R., Quinton, W., Craig, J., Hanisch, J., Sonnentag, O. (submitted), The hydrology of interconnected bog complexes in discontinuous permafrost regions.
  2. Garon-Labreque, M.-É., Léveillé-Bourret, É., Higgins, K., Sonnentag,O. (submitted), Additions to the Boreal flora of the Northwest Territories with a preliminary vascular flora of Scotty Creek.
  3. Pelletier, L., Strachan, I. B., Roulet, N. T., Garneau, M., Wischnewski, K. (under review), Effect of open water pools on ecosystem scale surface-atmosphere carbon dioxide exchange in a boreal peatland.
  4. Vierling, L., Hilker, T., Gamon, J. et al. incl. Sonnentag, O. (under review), Spectral metabolics: Emerging findings, methodologies, and implications of estimating canopy gas exchange using remote sensing.
  5. Moore, C., Brown, T., Keenan, T. et al. incl. Sonnentag, O. (under review), Combining remote sensing and time-lapse phenocams to study vegetation phenology in Australian ecosystems.
  6. Raabe, K., Pisek, J., Sonnentag, O., Annuk, K. (under review), Variations in leaf inclination angle distribution with height over the growing season and exposition for eight broadleaf tree species.
  7. Brown, T.B., Hultine, K., Steltzer, H. incl. Sonnentag, O. et al. (under review), Using phenocams to monitor our changing Earth: towards a global phenocam network.
  8. Detto, M., Asner, G.P., Mueller-Landau, H.C., Sonnentag, O. (under review), Spatial variability in tropical forest leaf area density from multireturn LiDAR and modeling.
  9. Toomey, M., Friedl, M.A., Frolking, S., Hufkens, K., Klosterman, S., Sonnentag, O., et al., (in press), Greenness indices from digital cameras predict the timing and seasonal dynamics of canopy-scale photosynthesis. Ecological Applications.
  10. Langer, M., Westermann, S., Walter Anthony, K. M., Wischnewski, K. and Boike, J. (2015), Frozen ponds: production and storage of methane during the Arctic winter in a lowland tundra landscape in northern Siberia, Lena River Delta. Biogeosciences, 11, 11061-11094.
  11. Vonk, J. E., Tank, S.E., Bowden, W. B. et al. incl. Helbig, M. (2015): Reviews and Syntheses: Effects of permafrost thaw on arctic aquatic ecosystems. Biogeosciences, 12, 7129-7167.
  1. Helbig, M., Wischnewski, K., Kljun, N., Chasmer, L., Quinton, W. L., Detto, M., Sonnentag, O. (2016): Regional atmospheric cooling and wetting effect of permafrost thaw-induced boreal forest loss. Global Change Biology. DOI: 10.1111/gcb.13348.
  2. Helbig, M., Wischnewski, K., Gosselin, G. H., Biraud, S. C, Bogoev, I., Chan, W. S., Euskirchen, E. S., Glenn, A. J., Sonnentag, O. (in revision): Addressing a systematic bias in carbon dioxide flux measurements with the EC150 and the IRGASON open-path gas analyzers. Agricultural and Forest Meteorology.
  3. Helbig, M., 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, DOI: 10.1002/2015GL067193