Contact Thomas A. Clair:

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Adjunct Professor, Department of Biology, Mount Allison University

Research Associate, Faculty of Forestry, University of New Brunswick

Adjunct Professor, Department of Earth Sciences, Dalhousie University


Ph.D. McMaster University (1990)

M.Sc. University of Ottawa (1976)

B.Sc. Mount Allison University (1973)


Thomas A. Clair

Research Scientist - Effects of atmospheric stressors on aquatic ecosystems

Water Science and Technology Directorate (Dartmouth, NS)

CURRENT S&T / RESEARCH - Reducing risks to Canadians, their health and their environment from air pollutants and greenhouse gas emissions

  • Designing research programs to study the interactions of atmospheric stressors such as acidification, metals and UVB with freshwater and wetland ecosystems
  • Aquatic geochemistry interactions and modeling
  • Understanding the role of dissolved organic carbon (DOC) in the chemistry of freshwaters as well as the effect of landscape factors in determining the chemistry of drainage waters
  • Mitigation and restoration of aquatic ecosystems from acidification


Environment Canada Representative and North American co-chair of the Working Group on Effects of the UN Economic Community of Europe Long-range transport of air pollutants (Geneva)

Canadian co-chair of Ecosystem effects chapter to NARSTO air pollution workgroup report, Washington, DC, Oct 2006 - present

Government of Canada Lead, UNECE Task Force on Reactive Nitrogen - ongoing from 2008

Member, American Society for Limnology and Oceanography; Past member of Finance Committee; Canadian Society of Limnology; American Geophysical Union; Reviewer for numerous scientific journals


Clair, T.A., I. F. Dennis , R. Vet,- H. Laudon. 2008. Long-term trends in catchment organic carbon and nitrogen exports from three acidified catchments in Nova Scotia. Canada. Biogeochemistry. 87: 83-97.

Clair, T. A., I.F. Dennis, D.A. Scruton and M. Gilliss. 2007. Acidification of freshwaters in Atlantic Canada: a review of data and the published literature. Environmental Reviews. 15: 153-167.

Clair, T.A., J. Aherne, I.F. Dennis, M. Gilliss, S. Couture, D. McNicol, R. Weeber, P.J. Dillon, W. Keller, D.S. Jeffries, S. Page, K. Timoffee and B.J. Cosby. 2007. Past and future changes to acidified eastern Canadian lakes: a geochemical modeling approach. Applied Geochem. 22:1189-1195.

Clair, T.A. and A. Hindar. 2005. Liming to mitigate the effects of acid rain on freshwaters: a review of recent results. Environmental Reviews. 13:91-128.

Dennis, I.F., T.A. Clair, C.T. Driscoll, N.C. Kamman, A. Chalmers, J.B. Shanley, S.A. Norton and J.S. Kahl. 2005. Patterns of surface water mercury distribution in northeastern North America. Ecotoxicology. 14: 113-123.

Clair, T.A., I.F. Dennis, P. Amiro and B.J. Cosby. 2004. Past and future chemistry changes in acidified Nova Scotian Atlantic salmon (Salmo salar) rivers: A dynamic modeling approach. Can. Jour. Fish. Aquat. Sci. 61:1965-1975.

Clair, T.A., J. Ehrman, I. Kaczmarska, G. Maillet, K.E. Day and A. Locke. 2001. Does UV-B affect summer zooplankton populations of temperate acid, humic and clearwater lakes? Hydrobiologia. 462: 75-89.

Expertise Categories associated with this S&T Expert:

     Aquatic Ecosystems
     Water Quality
          Acidification and acid rain
          Inorganic Chemistry
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