Associate Professor (Physical Oceanography)
Centre for Earth Observation Science
Department of Environment and Geography
Clayton H. Riddell Faculty of Environment, Earth and Resources
580 Wallace Building, The University of Manitoba
125 Dysart Road, Winnipeg, Manitoba R3T 2N2
Office phone: +1(204) 480-1493
M.Sc., University of Helsinki (2001) — Physical Oceanography
Ph.D., University of Manitoba (2008) — Physical Geography
Postdoctoral Fellow, Laboratoire d’Océanographie de Villefranche, CNRS (2008-2010) — Marine Optics
Postdoctoral Fellow, Scripps Institution of Oceangraphy, UCSD (2010-2011) — Marine Optics
GEOG 2930 Introduction to Oceanography
GEOG 4670 / GEOG 7010 Physical Oceanography of High Latitude Oceans (Short title – Polar Oceanography)
GEOG 4670 / GEOG 7010 Introduction to Hydrologic Optics (Short title - Hydrologic Optics)
I am a physical oceanographer focusing on the study of how sea ice influences physical and biological processes in the Arctic and subArctic seas. I use a combination of field observations, satellite remote sensing and modeling to investigate: (1) the temporal trends, spatial patterns and variability of sea ice covers; (2) the processes and feedbacks controlling air-ice-ocean interactions and seasonal evolution of sea ice; (3) how terrestrial runoff interacts with sea ice in coastal and shelf waters; and (4) sunlight propagation and interactions with materials (such as sediment, algae, CDOM) in estuarine, marine, and sea ice environments.
Recent and Significant Publications
Matthes, L. C., C. J. Mundy, S. L.-Girard, M. Babin, G. Verin, J. K. Ehn, Spatial heterogeneity as a key variable influencing spring-summer progression in UVR and PAR transmission through Arctic sea ice, Frontiers in Marine Science, section Global Change and the Future Ocean, 2020.
Eastwood, R. A., R. W. Macdonald, J. K. Ehn, J. Heath, L. Arragutainaq, P. G. Myers, D. G. Barber, Z. A. Kuzyk, Role of river runoff and sea ice brine rejection in controlling stratification throughout winter in southeast Hudson Bay, Estuaries and Coasts, 43, 756-786, 2020.
Matthes, L., J. K. Ehn, S. L.-Girard, N. M. Pogorzelec, M. Babin, and C. J. Mundy, Average cosine coefficient and spectral distribution of the light field under sea ice: Implications for primary production, Elementa: Science of the Anthropocene, 7(1), p.25, 2019.
Ehn, J. K., R. A. Reynolds, D. Stramski, D. Doxaran, and M. Babin, Patterns of suspended particulate matter across the continental margin in the Canadian Beaufort Sea during summer, Biogeosciences, 16, 1583-1605, 2019.
Diaz, A., J. K. Ehn, J. C. Landy, B. G. T. Else, K. Campbell, and T. N. Papakyriakou, The energetics of extensive melt water flooding of level Arctic sea ice, Journal of Geophysical Research: Oceans, 123, 8730-8748, 2018.