Mark W. Shephard

Current research and/or projects

Main efforts include utilizing satellite remote sensing to further advance the air quality research and applications (i.e. air quality monitoring, air quality model evaluations, cumulative effects of deposition, and emission of pollutants). 


Professional activities / interests



Education and awards

Environment Canada Geoff Howell Citation of Excellence for Innovation Award, 2017

American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE) : 2014 Crosby Field Award, 2015

Atmospheric and Environmental Research Employee of the Year Award, 2008

NASA Goddard Space Flight Center Award, 2005

M.Sc. Atmospheric and Oceanic Science, McGill University, 1999

Diploma in Meteorology, McGill University, 1996

B.Sc. (Hons) Major: Physics, Minor: Mathematics, University of Guelph, 1995

Key publications

Shephard M. W., E. Dammers, K. E. Cady-Pereira, S. K. Kharol, J. Thompson, Y. Gainariu-Matz, J. Zhang, C. A. McLinden, A. Kovachik, M. Moran, S. Bittman, C. Sioris, D. Griffin, M. J. Alvarado, C. Lonsdale, V. Savic-Jovcic, and Q. Zheng, Ammonia measurements from space with the Cross-track Infrared Sounder (CrIS): characteristics and applications, Atmos. Chem. Phys., 20, 2277–2302,, 2020.

Adams, C. C. A. McLinden, M. W. Shephard, N. Dickson, E. Dammers, J. Chen, P. Makar, K. E. Cady-Pereira, N. Tam, S. K. Kharol, L. N. Lamsal, and N. A. Krotkov.  Satellite-derived emissions of carbon monoxide, ammonia, and nitrogen dioxide from the 2016 Horse River wildfire in the Fort McMurray area, Atmos. Chem. Phys., 19, 2577-2599,, 2019.

Dammers, E., C. McLinden, D. Griffin, M. W. Shephard, S. Van Der Graaf, E. Lutsch, M. Schaap, Y. Gainairu-Matz, V. E. Fioletov, M. Van Damme, S. Whitburn, L. Clarisse, K. E. Cady-Pereira,  C. Clerbaux, P. F. Coheur, and J. Willem Erisman, NH3 emissions from large point sources derived from CrIS and IASI satellite observations, Atmos. Chem. Phys., 19, 12261–12293,, 2019.


Kharol, S. K., M. W. Shephard, C. A. McLinden, L. Zhang, C. E. Sioris, J. M. O’Brien,  R. Vet, K. E. Cady-Pereira, E. Hare, J. Siemons, and N. A. Krotkov,  Dry deposition of reactive nitrogen from satellite observations of ammonia and nitrogen dioxide over North America, Geophysical Research. Letters, 45, 1157-1166,, 2018.


Shephard, M.W. and K.E. Cady-Pereira, Cross-track Infrared Sounder (CrIS) Satellite Observations of Tropospheric Ammonia,  Atmos. Meas. Tech., 8, 1323–1336, doi:10.5194/amt-8-1323-2015, 2015.


Shephard, M.W, C. A. McLinden, K. E. Cady-Pereira, M. Luo, S. G. Moussa, A. Leithead, J. Liggio, R. M. Staebler, A. Akingunola, P. Makar, P. Lehr, J. Zhang, D. K. Henze, D. B. Millet, J. O. Bash, L. Zhu, K. C. Wells, S. L. Capps, S. Chaliyakunnel, M. Gordon, K. Hayden, J. R. Brook, M. Wolde, and S.-M. Li, Tropospheric Emission Spectrometer (TES) satellite validations observations of ammonia, methanol, formic acid, and carbon monoxide over the Canadian oil sands: validation and model evaluation, Atmos. Meas. Tech., 8, 5189–5211, doi:10.5194/amt-8-5189-2015, 2015


Shephard M.W., E. Mekis, R.J. Morris, Y. Feng, X. Zhang, K. Kilcup, and R. Fleetwood, Trends in Canadian Short Duration Extreme Precipitation: Including an IDF Perspective, submitted to Atmosphere-Ocean, 2014.

Shephard M.W., R. Morris, W. R. Burrows, and L. Welsh, A High-ResolutionCanadian Lightning Climatology, Atmosphere-Ocean, 51:1, 50-59, doi:10.1080/07055900.2012.755946, 2013.

Shephard M.W., K. E. Cady-Pereira, M. Luo, D. K. Henze, R. W. Pinder, et. al., TES Ammonia Retrieval Strategy and Global Observations of the Spatial and Seasonal Variability of Ammonia, Atmos. Chem. Phys., 11, 10743-10763, doi:10.5194/acp-11-10743-2011, 2011.

Shephard M.W., S.A. Clough, V.H. Payne, W. L. Smith, S. Kireev, and K. E. Cady-Pereira, Performance of the line-by-line radiative transfer model (LBLRTM) for temperature and species retrievals: IASI case studies from JAIVEx, Atmos. Chem. Phys., 9, 7397-7417, 2009.

Shephard M.W., H. M. Worden, K. E. Cady-Pereira, et. al., Tropospheric Emission Spectrometer Spectral Radiance Comparisons, J Geophys Res., 113, D15S05, doi:10.1029/2007JD008856, 2008.

Beer, R., M. W. Shephard, S. S. Kulawik, S. A. Clough, A. Eldering, K. W. Bowman, et. al., First satellite observations of lower tropospheric ammonia & methanol, Geophysical Res. Letters, 35, L09801, doi:10.1029/2008GL033642, 2008.

Iacono M. J., J. S. Delamere, E. J. Mlawer, M. W. Shephard, S. A. Clough, and W. Collins, Radiative forcing by long-lived greenhouse gases: Calculations with the AER radiative transfer models, J. Geophys. Res., 113, D13103, doi:10.1029/2008JD009944, 2008.

Clough S.A., Shephard M.W., Worden J., Brown P.D., Worden H.M., Luo M., Rodgers C.D., et. al., Forward Model and Jacobians for Tropospheric Emission Spectrometer Retrievals. IEEE Trans. Geosci. Remote Sens., 44, 1308-1323, 2006.

Bowman K, C.D. Rodgers, S. Sund-Kulawik, J. Worden, E. Sarkissian, G. Osterman, T. Steck, M. Luo, A. Eldering, M.W. Shephard, H. Worden, S.A. Clough, P.D. Brown, C.P. Rinsland, M. Lampe, M. Gunson, R. Beer, Tropospheric Emission Spectrometer: Retrieval Method and Error Analysis. IEEE Trans. Geosci. Remote Sens., 44, 1352-1358, 2006.

Clough S.A, Shephard M.W, Mlawer E.J, Delamere J.S, Iacono M.J, Cady-Pereira K.E, Boukabara S, Brown P.D. Atmospheric Radiative Transfer Modeling: a Summary of the AER Codes. J Quant Spectrosc Radiat Transfer, 91, 233-244, 2005.

Shephard M.W. and E.J. Kennelly. Effect of Band-to-Band Coregistration on Fire Retrievals. IEEE Trans. Geosci. Remote Sens., 41, pp. 2648-2661, 2003.

Research facility

4905 Dufferin Street
Toronto, ON M3H 5T4


American Geophysical Union

American Meteorological Society

Canadian Meteorological and Oceanographic Society

Canadian Remote Sensing Society

European Geophysical Union