Jens Ehn
Post-doctoral researcher (2008-present)
Contact information:
Phone: +33 (0)4 93 76 37 12
Fax: +33 (0)4 93 76 38 73
Education:

Ph.D. “Solar Radiation Interactions with Seasonal Sea Ice” (2003-2008)
Center of Earth Observation Science (CEOS), Department of Environment and Geography, University of Manitoba, Winnipeg, Canada.

M.Sc. “Optical Properties of the Sea Ice and Seawater in Santala Bay: Measurements and Modelling (2000-2001)
Department of Geophysics, University of Helsinki, Finland.

 
 

Research interests:

Ocean-sea ice-atmosphere interactions; Physical and optical properties of the sea ice environment affecting light propagation and energy balance; Inter-disciplinary research linking physical, biological and chemical processes.

Publications:
  • Mundy, C. J., M. Gosselin, J. K. Ehn, Y. Gratton, A. Rossnagel, D. G. Barber, J. Martin, J.-E. Tremblay, M. Palmer, K. Arrigo, B. Else, T. N. Papakyriakou, (2009). Contribution of under-ice primary production to an ice-edge upwelling phytoplankton bloom in the Canadian Beaufort Sea, Geophysical Research Letters, 36, L17601, doi:10.1029/2009GL038837.
  • Barber, D. G., B. J. Hwang, J. K. Ehn, J. Iacozza, R. Galley, J. Hanesiak, T. Papakyriakou, J. V. Lukovich, (2009). The Ocean-Sea Ice-Atmosphere (OSA) Interface in the Southern Beaufort Sea, On thin ice: a synthesis of the Canadian Arctic Shelf Exchange Study (CASES), 216 pp.
  • Galley, R., E. Key, D. G. Barber, B. J. Hwang and J. K. Ehn, (2008). Spatial and temporal variability of sea ice in the southern Beaufort Sea and Amundsen Gulf: 1980-2004, Journal of Geophysical Research, 113, C05S95, doi:10.1029/2007JC004553.
  • Ehn, J. K., T. N. Papakyriakou and D. G. Barber, (2008). Inference of optical properties from radiation profiles within melting sea ice, Journal of Geophysical Research, 113, C09023, doi:10.1029/2007JC00456.
  • Hwang, B. J., J. K. Ehn, and D. G. Barber, (2008). Impact of ice temperature on the microwave emissivity of thin newly formed sea ice during fall freeze-up, Journal of Geophysical Research, 113, C02021, doi:10.1029/2006JC003930.
  • Ehn, J. K., C. J. Mundy, and D. G. Barber, (2008). Bio-optical and structural properties inferred from irradiance measurements within the bottommost layers in an Arctic landfast sea ice cover, Journal of Geophysical Research, 113, C03S03, doi:10.1029/2007JC004194.
  • Bélanger, S., J. Ehn and M. Babin, (2007). Impact of sea ice on the retrieval of water-leaving reflectance, chlorophyll a concentration and inherent optical properties from satellite ocean color data, Remote Sensing of Environment, 111, 51-68, doi:10.1016/j.rse.2007.03.013.
  • Hwang, B. J., J. K. Ehn, D. G. Barber, R. Galley, and T. C. Grenfell, (2007).  Investigations of newly formed sea ice in the Cape Bathurst polynya: 2. Microwave emissions, Journal of Geophysical Research, 112, C05003, doi:10.1029/2006JC003703.
  • Ehn, J. K., B. J. Hwang, R. Galley, and D. G. Barber, (2007). Investigations of newly formed sea ice in the Cape Bathurst polynya: 1. Structural, physical and optical properties, Journal of Geophysical Research, 112, C05002, doi:10.1029/2006JC003702.
  • Mundy, C. J., J. K. Ehn, D. G. Barber, and C. Michel, (2007). Influence of snow cover and algae on the spectral dependence of transmitted irradiance through Arctic landfast first-year sea ice, Journal of Geophysical Research, 112, C03007, doi:10.1029/2006JC003683.
  • Uusikivi, J., J.Ehn and M. A. Granskog, (2006). Direct measurements of turbulent momentum, heat and salt fluxes under landfast ice in the Baltic Sea, Annals of Glaciology, 44.
  • Ehn, J. K., M. A. Granskog, T. Papakyriakou, R. Galley and D. G. Barber, (2006). Surface albedo observations of Hudson Bay landfast sea ice during the spring melt, Annals of Glaciology, 44, 23-29.
  • Hwang, B. J., J. K. Ehn, and D. G. Barber, (2006). Relationships between albedo and microwave emissions over thin newly formed sea ice during fall freeze-up, Geophysical Research Letters, 33, L17503, doi:10.1029/2006GL027300.
  • Rintala, Janne-Markus, Jonna Piiparinen, Jens Ehn, Riitta Autio, and Harri Kuosa, (2006). Changes in phytoplankton biomass and nutrient quantities in sea ice as responses to light/dark manipulations during different phases of the Baltic winter 2003, J. Kuparinen, E. Sandberg-Kilpi and J. Mattila (eds), Baltic Sea: A Lost System or a Future Treasury, Hydrobiologia, 554:11-24, doi:10.1007/s10750-005-1002-y.
  • Bélanger, S., J. Ehn, and M. Babin, (2005). Impact of sea ice on ocean color remote sensing, Proc. SPIE Vol. 5885, Remote Sensing of the Coastal Oceanic Environment; Robert J. Frouin, Marcel Babin, Shubha Sathyendranath (Eds.), p. 68-76.
  • Granskog, M.A., H. Kaartokallio, H. Kuosa, D.N. Thomas, J. Ehn and E. Sonninen, (2005). Scales of horizontal patchiness in chlorophyll a, chemical and physical properties of landfast sea ice in the Gulf of Finland (Baltic Sea), Polar Biology, 28, 276-283.
  • Granskog, M. A., Virkkunen, K., Thomas, D. N., Ehn, J., Kola, H. and Martma, T., (2005). Chemical properties of brackish water ice in the Bothnian Bay, the Baltic Sea, Journal of Glaciology, 50, 292-302.
    Granskog, M. A., Ehn, J. and Niemelä, M., (2005). Characteristics and potential impacts of under-ice river plumes in the seasonally ice-covered Bothnian Bay (Baltic Sea), Journal of Marine Systems, 53, 187-196.
  • Ehn, J., Granskog, M. A., Reinart, A. and Erms, A. (2004). Optical properties of melting landfast sea ice and underlying seawater in Santala Bay, Gulf of Finland, Journal of Geophysical Research, 109(C9), C09003, doi:10.1029/2003JC002042.
  • Granskog, M. A., Leppäranta, M., Kawamura, T., Ehn, J. and Shirasawa, K., (2004). Seasonal development of the properties and composition of landfast sea ice in the Gulf of Finland, the Baltic Sea, Journal of Geophysical Research, 109(C2), C02020, doi:10.1029/2003JC001874.
  • Rasmus, K., J. Ehn, M. Granskog, E. Kärkäs, M. Leppäranta, A. Lindfors, A. Pelkonen, and S. Rasmus, (2002). Optical measurements of sea ice in the Gulf of Finland, Nordic Hydrology, 33 (2/3), 207-226.
  • Kawamura, T., K. Shirasawa, N. Ishikawa, A. Lindfors, K. Rasmus, M. Granskog, J. Ehn, M. Leppäranta, T. Martma and R. Vaikmäe, (2001). Time-series observations of the structure and properties of brackish ice in the Gulf of Finland, Annals of Glaciology, 33 p. 1-4.

    2013

  • Bélanger, S., Cizmeli, S. A., Ehn, J., Matsuoka, A., Doxaran, D., Hooker, S., and Babin, M.(2013). Light absorption and partitioning in Arctic Ocean surface waters: impact of multiyear ice melting, Biogeosciences, 10, 6433-6452, doi:10.5194/bg-10-6433-2013. (Get PDF Reprint)
  • 2012

  • Doxaran, D., Ehn, J., Bélanger, S., Matsuoka, A., Hooker, S., and M. Babin (2012): Optical characterisation of suspended particles in the Mackenzie River plume (Canadian Arctic Ocean) and implications for ocean colour remote sensing, Biogeosciences, 9, 3213-3229, doi:10.5194/bg-9-3213-2012 (Get PDF Reprint)
  • 2007

  • Bélanger, S., Ehn, J. and M. Babin, (2007). Impact of sea ice on the retrieval of water-leaving reflectance, chlorophyll a concentration and inherent optical properties from satellite Ocean Color data. Remote Sensing of Environement, 111, 51–68 (Get PDF Reprint).

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