Thomas W.D. Edwards

Professor,
Isotope Hydrology
and Geochemistry

Earth and Environmental Sciences
University of Waterloo
200 University Avenue West
Waterloo ON N2L 3G1 CANADA

tel +1 519 888 4567 (extension 33 236)
fax +1 519 746 7484
e-mail twdedwar@uwaterloo.ca

Research Interests

My research involves the use of naturally occurring isotopes as tracers in water and climate studies and in closely related aspects of environmental isotope geochemistry.  The efforts of my research group are dedicated to documentation and interpretation of variations in the relative abundances of the rare stable isotopes of oxygen (¹⁸O) and hydrogen (²H) in precipitation, surface and ground waters, as well as these isotopes and those of carbon (¹³C) and nitrogen (¹⁵N) in materials like tree rings and lake sediments, as indicators of past environmental history and ongoing hydrologic and climatic change. 

I am one of several senior researchers affiliated with the University of Waterloo Environmental Isotope Laboratory, a world-leading facility specializing in the application of natural isotope tracers in environmental science.  I also work closely with a number of colleagues on the Canadian Network for Isotopes in Precipitation (CNIP), one of several national networks affiliated with the Global Network of Isotopes in Precipitation (GNIP) program operated by the International Atomic Energy Agency and the World Meteorological Organization.   

Other Duties and Activities

Chair, University of Waterloo President's Committee on Northern Studies.  This includes administration of the Northern Scientific Training Program (NSTP) of Indian and Northern Affairs Canada, which provides travel funds for domestic students to conduct northern fieldwork.  For more information, visit the NSTP site or contact me directly. 

Graduate Student Opportunities

Challenging opportunities currently exist for graduate student research at the MSc and PhD levels in water and climate research using isotope tracers, with field work possibilities in western and northern Canada and Fennoscandia.  Inquiries are always welcome.

Selected Publications

Birks, S.J., and Edwards, T.W.D. 2009. Atmospheric circulation controls on precipitation isotope-climate relations in western Canada. Tellus 61B, 566-576.  pdf

Porter, T.J., Pisaric, M.F.J., Kokelj, S.V., and Edwards, T.W.D. 2009. Climatic signals in δ¹³C and δ¹⁸O of tree-rings from white spruce in the Mackenzie Delta region, northern Canada. Arctic, Antarctic and Alpine Research, doi: 10.1657/1938-4246-41.4

Price, J.S., Edwards, T.W.D., Yi, Y., and Whittington, P. 2009. Physical and isotopic characterization of evaporation from Sphagnum moss. Journal of Hydrology 369, 175-182.  pdf

Prowse, T.D., Furgal, C., Bonsal, B., and Edwards, T.W.D. 2009. Climatic conditions in northern Canada: past and future. Ambio 38, 257-265.  pdf

Sinnatamby, R.N., Yi, Y., Sokal, M.A., Clogg-Wright, K.P., Asada, T., Vardy, S.R., Karst-Riddoch, T.L., Last, W.M., Johnston, J.W., Hall, R.I., Wolfe, B.B., and Edwards, T.W.D. 2009. Historical and paleolimnological evidence for expansion of Lake Athabasca (Canada) during the Little Ice Age. Journal of Paleolimnology, doi: 10.1007/s10933-009-9361-4  pdf

Brahney, J., Clague, J.J., Menounos, B, and Edwards, T.W.D. 2008. Timing and cause of water level fluctuations in Kluane Lake, Yukon Territory, over the past 5000 years. Quaternary Research 70, 213-227.  pdf

Brahney, J., Clague, J.J., Menounos, B., and Edwards, T.W.D. 2008. Geochemical reconstruction of late Holocene drainage and mixing in Kluane Lake, Yukon Territory. Journal of Paleolimnology 40, 489-505.  pdf

Brock, B.E., Wolfe, B.B., and Edwards, T.W.D. 2008. Spatial and temporal perspectives on spring break-up flooding in the Slave River Delta, NWT. Hydrological Processes 22, 4058-4072.  pdf

Edwards, T.W.D., Birks, S.J., Luckman, B.H. and MacDonald, G.M. 2008. Climatic and hydrologic variability during the past millennium in the eastern Rocky Mountains and northern Great Plains of western Canada. Quaternary Research 70, 188-197.  pdf

Gibson, J.J., Birks, S.J., and Edwards, T.W.D. 2008. Global prediction of δ_A and δ²H-δ¹⁸O evaporation slopes for lakes and soil water accounting for seasonality. Global Biogeochemical Cycles 22, GB2031, doi:10.1029/2007GB002997  pdf

Hammarlund, D., and Edwards, T.W.D. 2008. Stable isotope variations in stalagmites from northwestern Sweden document changes in temperature and vegetation during the early Holocene: a comment on Sundqvist et al. (2007). The Holocene 18, 1-2.

Lewis, C.F.M, Blasco, S.M., King, J.W., Heil Jr., C.W., Brooks, G.R., Medioli, B.E., Coakley, J.P., Croley, T.E., II, Dettman, D.L., Edwards, T.W.D., Laird, K.R., McAndrews, J.H., McCarthy, F.M.G., Moore, T.C., Jr., Rea, D.K., and Smith, A.J. 2008. Holocene dry climate disconnected the Laurentian Great Lakes. Eos 89, 541-542.

MacDonald, G.M., Moser, K.A., Bloom, A.M., Porinchu, D.F., Potito, A., Wolfe, B.B., Edwards, T.W.D., Petel, A., Orme, A.R., and Orme, A. 2008. Evidence of temperature depression and hydrological variations in the eastern Sierra Nevada during the Younger Dryas stade. Quaternary Research 70, 131-140.  pdf

Wolfe, B.B., Hall, R.I., Edwards, T.W.D., Jarvis, S.R., Sinnatamby, R.N., Yi, Y., and Johnston, J.W. 2008. Climate-driven shifts in quantity and seasonality of river discharge over the past 1000 years from the hydrographic apex of North America. Geophysical Research Letters 35, L24402. doi: 10.1029/2008GL036125 pdf

Wolfe, B.B., Hall, R.I., Edwards, T.W.D., Vardy, S.R., Falcone, M.D., Sjunneskog, C., Sylvestre, F., McGowan, S., Leavitt, P.R., and van Driel, P. 2008. Hydroecological responses of the Athabasca Delta, Canada, to changes in river flow and climate during the 20^th century. Ecohydrology 1, 131-148.  pdf

Yi, Y., Brock, B.E., Falcone, M.D., Wolfe, B.B., and Edwards, T.W.D. 2008. A coupled isotope tracer method to characterize input water to lakes. Journal of Hydrology 350, 1-13.  pdf

Birks, S.J., Edwards, T.W.D., and Remenda, V.H. 2007. Isotopic evolution of Glacial Lake Agassiz: new insights from cellulose and porewater isotopic archives. Palaegeography, Palaeoclimatology, Palaeoecology 246, 8-22.  pdf

Brock, B.E., Wolfe, B.B., and Edwards, T.W.D. 2007. Characterizing the hydrology of shallow floodplain lakes in the Slave River Delta, NWT, Canada, using water isotope tracers. Arctic, Antarctic and Alpine Research 39, 388-401.  pdf

Klisch, M., Rozanski, K., Goslar, T., Edwards, T.W.D., and Shemesh, A. 2007. δ¹⁸O of cellulose organic fraction combined with δ¹⁸O of calcite and δ¹⁸O of diatoms in lake sediments: a new tool for palaeoclimate reconstructions on continents? ESIR IX, Cluj-Napoca, Romania, June 2007.  pdf

Wolfe, B.B., Armitage, D., Wesche, S., Brock, B.E., Sokal, M.A., Clogg-Wright, K.P., Mongeon, C.L., Adam, M., Hall, R.I., and Edwards, T.W.D. 2007. From isotopes to TK interviews: Towards interdisciplinary research in Fort Resolution and the Slave River Delta, Northwest Territories. Arctic 60, 75-87.  pdf

Wolfe, B.B., Falcone, M.D., Clogg-Wright, K.P., Mongeon, C.L., Yi, Y., Brock, B.E., St. Amour, N.A. Mark, W.A., and Edwards, T.W.D. 2007. Progress in isotope paleohydrology using lake sediment cellulose. Journal of Paleolimnology 37, 221-231.  pdf

Wolfe, B.B., Karst-Riddoch, T.L., Hall, R.I., Edwards, T.W.D., English, M.C., Palmini, R., McGowan, S., Leavitt, P.R., and Vardy, S.R. 2007. Classification of hydrological regimes of northern floodplain basins (Peace-Athabasca Delta, Canada) from analysis of stable isotopes (d¹⁸O, d²H) and water chemistry. Hydrological Processes 21, 151-168.  pdf

Brahney, J., Bos, D.G., Pellatt, M.G., Edwards, T.W.D., and Routledge, R. 2006. The influence of nitrogen limitation on d¹⁵N and C:N in sediments from sockeye salmon nursery lakes in British Columbia, Canada. Limnology and Oceanography 51, 2333-2340.  pdf

Wolfe, B.B., Hall, R.I., and Edwards, T.W.D. 2006. Assessing the status of the Peace-Athabasca Delta ecosystem: challenging the paradigm from a paleoenvironmental perspective. Meridian, Fall/Winter 2006, Canadian Polar Commission, 7-12.  pdf

Wolfe, B.B., Hall, R.I., Last, W.M., Edwards, T.W.D., English, M.C., Karst-Riddoch, T.L., Paterson, A., and Palmini, R. 2006. Reconstruction of multi-century flood histories from oxbow lake sediments, Peace-Athabasca Delta, Canada. Hydrological Processes 20, 4131-4153.  pdf

Gibson, J.J., Edwards, T.W.D., Birks, S.J., St. Amour, N.A., Buhay, W.M., McEachern, P., Wolfe, B.B., and Peters, D.L. 2005. Progress in isotope tracer hydrology in Canada. Hydrological Processes 19, 303-327.  pdf

St. Amour, N., Gibson, J.J., Edwards, T.W.D., Prowse, T.D., and Pietroniro, A. 2005. Isotopic time-series partitioning of streamflow components in wetland-dominated catchments, lower Liard River Basin, Northwest Territories, Canada. Hydrological Processes 19, 3357-3381.  pdf

Stadnyk, T.A., St. Amour, N.A., Kouwen, N., Edwards, T.W.D., Pietroniro, A., and Gibson, J.J. 2005. A groundwater separation study in boreal wetland terrain: the WATFLOOD hydrological model compared with stable isotope tracers. Isotopes in Environmental and Health Studies 41, 49-68.  pdf

Wolfe, B.B., Karst-Riddoch, T.L., Vardy, S.R., Falcone, M.D., Hall, R.I., and Edwards, T.W.D. 2005. Impacts of climate and river flooding on the hydro-ecology of a floodplain basin, Peace-Athabasca Delta, Canada: A.D. 1700-present. Quaternary Research 64, 147-162.  pdf

Edwards, T.W.D., Wolfe, B.B., Gibson, J.J., and Hammarlund, D. 2004. Use of water isotope tracers in high latitude hydrology and paleohydrology. In Long-term Environmental Change in Arctic and Antarctic Lakes. Developments in Paleoenvironmental Research, Volume 8. Edited by R. Pienitz, M.S.V. Douglas and J.P. Smol. Springer, Dordrecht, The Netherlands, 187-207.  pdf

Hammarlund, D., Velle, G., Wolfe, B.B., Edwards, T.W.D., Snowball, I., Barnekow, L., Holmgren, S., Lamme, S., Wohlfarth, B., and Possnert, G. 2004. Palaeolimnological and sedimentary responses to Holocene forest retreat in the Scandes Mountains, west-central Sweden. The Holocene 14, 862-876.  pdf

MacDonald, G.M., Edwards, T.W.D., Gervais, B., Laing, T.E., Pisaric, M.F.J., Porinchu, D.F., Snyder, J.A., Solovieva, N., Tarasov, P., and Wolfe, B.B. 2004. Paleolimnological research from northern Russian Eurasia. In Long-term Environmental Change in Arctic and Antarctic Lakes. Developments in Paleoenvironmental Research, Volume 8. Edited by R. Pienitz, M.S.V. Douglas and J.P. Smol. Springer, Dordrecht, The Netherlands, 349-380. 

Wolfe, B.B., Edwards, T.W.D., Jiang, H.B., MacDonald, G.M., Gervais, B.R., and Snyder, J.A. 2003. Effect of varying oceanicity on early to mid-Holocene paleohydrology, Kola Peninsula, Russia: isotopic evidence from treeline lakes. The Holocene 13, 153-160.  pdf

Alverson, K., and Edwards, T.W.D. 2003. Palaeohydrology and International Global Change Programs. In Palaeohydrology: Understanding Global Change. Edited by K. Gregory and G. Benito. John Wiley and Sons, Chichester, UK, 25-31. pdf

Birks, S.J., Gibson, J.J., Gourcy, L., Aggarwal, P.K., and Edwards, T.W.D. 2002. Maps and animations offer new opportunities for studying the global water cycle. EOS 83, 10 September 2002.  link

Edwards, T.W.D. 2002. Mapping and modelling isotope climate and palaeoclimate. IGBP Global Change News Letter, April 2002, 2-4.  pdf

Edwards, T.W.D., Birks, S.J., and Gibson, J.J. 2002. Isotope tracers in global water and climate studies of the past and present. International Conference on the Study of Environmental Change Using Isotope Techniques, International Atomic Energy Agency, Vienna, April 2001, IAEA-CN-80/66.  pdf

Edwards, T.W.D., Kull, C., and Alverson, K. (editors) 2002. Stable Isotopes. PAGES News 10, 24 pp.  pdf

Gibson, J.J., and Edwards, T.W.D. 2002. Regional surface water balance and evaporation-transpiration partitioning from a stable isotope survey of lakes in northern Canada. Global Biogeochemical Cycles 16, DOI: 10.1029/2001GB001839.  pdf

Hammarlund, D., Barnekow, L., Birks, H.J.B., Buchhardt, B., and Edwards, T.W.D. 2002. Holocene changes in atmospheric circulation recorded in the oxygen-isotope stratigraphy of lacustrine carbonates from northern Scandinavia. The Holocene 12, 331-359.  pdf

Edwards, T.W.D., and Birks, S.J. 2001. Isotope Climatology and the Global Network for Isotopes in Precipitation: Directions for the Future.  In Report of the Third Meeting of the GNIP Scientific Steering Committee, WMO Headquarters, Geneva, October 2001, 24 pp. pdf

Motz, J., Shouakar-Stash, O., Drimmie, R.J., Edwards, T.W.D., Frape, S.K., and Annable, W.K. 2001. Hydrogen-isotope analysis of potentially toxic organic materials employing manganese reduction and disposable nickel-pyrolysis tubes. Chemical Geology 181, 67-71.  pdf

Wolfe, B.B., Edwards, T.W.D., Beuning, K.R.M., and Elgood, R.J. 2001. Carbon and oxygen isotope analysis of lake sediment cellulose: methods and applications. In Tracking Environmental Change Using Lake Sediments: Physical and Chemical Techniques, Developments in Paleoenvironmental Research, Vol. 2. Edited by W.M. Last and J.P. Smol. Kluwer Academic Publishers, Dordrecht, The Netherlands, 373-400.  pdf

Birks, S.J., Remenda , V.H., and Edwards, T.W.D. 2000. Clay aquitards as isotopic archives of Holocene paleoclimate in the northern Great Plains: Sensitivity analysis. Hydrological Processes 14, 1523-1536.  pdf

Edwards, T.W.D., Graf, W., Trimborn, P., Stichler, W., Lipp, J., and Payer, H.D. 2000. d¹³C response surface resolves humidity and temperature signals in trees. Geochimica et Cosmochimica Acta 64, 161-167.  pdf

MacDonald, G.M., Velichko, A.A., Kremenetski, C.V., Borisova, O.K., Goleva, A.A., Andreev, A.A., Cwynar, L.C., Riding, R.T., Forman, S.L., Edwards, T.W.D., Aravena, R., Hammarlund, D., Szeicz, J.M., and Gattaulin, V.N. 2000. Holocene treeline history and climate change across northern Eurasia: New evidence from radiocarbon dated tree macrofossils. Quaternary Research 53, 302-311.  pdf

Wolfe, B.B., Edwards, T.W.D., and Duthie, H.C. 2000. A 6000-year record of interaction between Hamilton Harbour and Lake Ontario: quantitative assessment of recent hydrologic disturbance using ¹³C in lake sediment cellulose. Aquatic Ecosystem Health and Management 3, 47-54.  pdf

Wolfe, B.B., Edwards, T.W.D., Aravena, R., Forman, S.L., Warner, B.G., Velichko, A.A., and MacDonald, G.M. 2000. Holocene paleohydrology and paleoclimate at treeline, north-central Russia, inferred from oxygen isotope records in lake sediment cellulose. Quaternary Research 53, 319-329.  pdf

Gibson, J.J., and Edwards, T.W.D. 1999. The evaporation pan technique revisited: old theory and a new application for time-weighted synoptic tracing of the isotopic composition of atmospheric vapour. IAEA Water and Environment News 8/9, 9-10.  pdf

Gibson, J.J., Edwards, T.W.D., and Prowse, T.D. 1999. Pan-derived isotopic composition of atmospheric water vapour and its variability in northern Canada. Journal of Hydrology 217, 55-74. pdf

Hammarlund, D., Edwards, T.W.D., Björck, S., Buchhardt, B., and Wohlfarth, B. 1999. Climate and environment during the Younger Dryas (GS-1) as reflected by composite stable isotope records of lacustrine carbonates at Torreberga, southern Sweden. Journal of Quaternary Science 14, 17-28. pdf

Wolfe, B.B., Edwards, T.W.D., and Aravena, R. 1999. Changes in carbon and nitrogen cycling during treeline retreat recorded in the isotopic content of lacustrine organic matter, western Taimyr Peninsula, Russia. The Holocene 9, 215-222.  pdf

Hagan, T.H., Coniglio, M., and Edwards, T.W.D. 1998. Bioerosion of mollusk shells from a marl lake, southern Ontario. Ichnos 6, 117-127.

Shanley, J.B, Kendall, C., Pendall, E., Stevens, L.R., Michel, R.L., Phillips, P.J., Forester, R.M., Naftz, D.L., Liu, B., Stern, L., Wolfe, B.B., Chamberlain, C.P., Leavitt, S.W., Heaton, T.H.E., Mayer, B., Cecil, L.D., Lyons, W.B., Katz, B.G., Betancourt, J., McKnight, D.M., Blum, J.D., Edwards, T.W.D., House, H.R., Ito, E., Aravena, R., and Whelan, J.F. 1998. Isotopes as Indicators of Environmental Change. In Isotope Tracers in Catchment Hydrology, Chapter 23. Edited by C. Kendall and J.J. McDonnell. Elsevier, 761-816.

Wolfe, B.B. and Edwards, T.W.D. 1998. Comment on "Stable carbon and oxygen isotope records from Lake Erie sediment cores: mollusc aragonite 4600 BP-200 BP" (J. Great Lakes Res. 23(3), 307-316). Journal of Great Lakes Research 24, 736-738.

Motz, J.E., Edwards, T.W.D., and Buhay, W.M. 1997. Use of nickel-tube pyrolysis for hydrogen-isotope analysis of water and other compounds. Chemical Geology 140, 145-149. pdf

Wolfe, B.B., and Edwards, T.W.D. 1997. Hydrologic control on the oxygen-isotope relation between sediment cellulose and lake water, Taimyr Peninsula, Russia: Implications for the use of surface-sediment calibrations in paleolimnology. Journal of Paleolimnology 18, 283-291.

Buhay, W.M., Edwards, T.W.D., and Aravena, R. 1996. Evaluating kinetic fractionation factors used for ecologic and paleoclimatic reconstructions from oxygen and hydrogen isotope ratios in plant water and cellulose. Geochimica et Cosmochimica Acta 60, 2209-2218. pdf

Duthie, H.C., Yang, J.-R., Edwards, T.W.D., Wolfe, B.B., and Warner, B.G. 1996. Hamilton Harbour, Ontario: 8300 years of limnological and environmental change inferred from microfossil and isotopic analyses. Journal of Paleolimnology 15, 79-97.

Edwards, T.W.D., and Luckman, B.H. 1996. Isotope dendroclimatology studies in the Canadian Rockies: some preliminary results. In Tree Rings, Environment and Humanity. Edited by J.S. Dean, D.M. Meko, and T.W. Swetnam. Radiocarbon, 585-596.

Edwards, T.W.D., Wolfe, B.B., and MacDonald, G.M. 1996. Influence of changing atmospheric circulation on precipitation d¹⁸O-temperature relations in Canada during the Holocene. Quaternary Research 46, 211-218. pdf

Gibson, J.J., Edwards, T.W.D., and Prowse, T.D. 1996. Development and validation of an isotopic method for estimation of lake evaporation. Hydrological Processes 10, 1369-1382. pdf

Gibson, J.J., Prowse, T.D., and Edwards, T.W.D. 1996. Evaporation from a small lake in the continental arctic using multiple methods. Nordic Hydrology 27, 1-24.

Lipp, J., Trimborn, P., Edwards, T.W.D., Graf, W., and Becker, B. 1996. Climate signals in a ²H and ¹³C chronology (1882-1989) from tree rings of spruce (Picea abies L.), Schußbach Forest, Germany. In Tree Rings, Environment and Humanity. Edited by J.S. Dean, D.M. Meko, and T.W. Swetnam. Radiocarbon, 603-610.

Lipp, J., Trimborn, P., Edwards, T.W.D., Waisel, Y., and Yakir, D. 1996. Climatic effects on the d¹⁸O and d¹³C of cellulose in the desert tree Tamarix jordanis. Geochimica et Cosmochimica Acta 60, 3305-3309. pdf

Wolfe, B.B., Edwards, T.W.D., Aravena, R., and MacDonald, G.M. 1996. Rapid Holocene hydrologic change along boreal treeline revealed by d¹³C and d¹⁸O in organic lake sediments, Northwest Territories, Canada. Journal of Paleolimnology 15, 171-181.

Buhay, W.M., and Edwards, T.W.D. 1995. Climate in southwestern Ontario, Canada, between AD 1610 and 1885 inferred from oxygen and hydrogen isotopic measurements of wood cellulose from trees in different hydrologic settings. Quaternary Research 44, 438-446. pdf

Edwards, T.W.D., and Buhay, W.M. 1994. Isotope paleoclimatology of southern Ontario. In Great Lakes Archaeology and Paleoecology: Exploring Interdisciplinary Initiatives for the Nineties. Edited by R.I. MacDonald. Quaternary Sciences Institute, University of Waterloo, 197-208.

Edwards, T.W.D., Buhay, W.M., Elgood, R.J., and Jiang, H.B. 1994. An improved nickel-tube pyrolysis method for oxygen isotope analysis of organic matter and water. Chemical Geology (Isotope Geoscience Section) 114, 179-183.

Gibson, J.J., Edwards, T.W.D., and Prowse, T.D. 1994. Evaporation in the North: overview of quantitative studies using stable isotopes. In Mackenzie Basin Impact Study (MBIS) Interim Report #2. Edited by S.J. Cohen. Environment Canada, 138-150.

Remenda, V.H., Cherry, J.A., and Edwards, T.W.D. 1994. Isotopic composition of old ground water from Lake Agassiz: implications for late Pleistocene climate. Science 266, 1975-1978. pdf

Edwards, T.W.D. 1993. Interpreting past climate from stable isotopes in continental organic matter. In Climate Change in Continental Isotopic Records. Edited by P.K. Swart, J. McKenzie, K.C. Lohmann, S. Savin. American Geophysical Union, Geophysical Monograph 78, Washington DC, 333-341.  pdf

Gibson, J.J, Edwards, T.W.D., Bursey, G.G., and Prowse, T.D. 1993. Estimating evaporation using stable isotopes: quantitative results and sensitivity analysis for two catchments in northern Canada. Nordic Hydrology24, 79-94.

Gibson, J.J., Edwards, T.W.D., and Prowse, T.D. 1993. Runoff generation in a high boreal wetland in northern Canada. Nordic Hydrology 24, 213-224. pdf

MacDonald, G.M., Edwards, T.W.D., Moser, K.A., Pienitz, R., and Smol, J.P. 1993. Rapid response of treeline vegetation and lakes to past climate warming. Nature 361, 243-246.

Van Stempvoort, D.R., Edwards, T.W.D., Evans, M.S., and Last, W.M. 1993. Paleohydrology and paleoclimate records in a saline prairie lake core: mineral, isotope and organic indicators. Journal of Paleolimnology 8, 135-147.

Clague, J.J., Mathewes, R.W., Buhay, W.M., and Edwards, T.W.D. 1992. Early Holocene climate at Castle Peak, southern Coast Mountains, British Columbia, Canada. Palaeogeography, Palaeoclimatology, Palaeoecology 95, 153-167.  pdf

Kerr-Lawson, L.J., Karrow, P.F., Edwards, T.W.D., and Mackie, G.L. 1992. A paleoenvironmental and stable isotope study of the molluscs from the Don Formation (Sangamonian?), Don Valley Brickyards, Toronto, Ontario. Canadian Journal of Earth Sciences 29, 2406-2417.

 Bursey, G.G., Edwards, T.W.D., and Frape, S.K. 1991. Water balance and geochemistry studies in a tundra watershed, District of Keewatin, N.W.T. In Northern Hydrology: Selected Perspectives. Edited by T.D. Prowse and C.S.L. Ommanney. National Hydrology Research Institute Symposium No. 6, 17-31.

Bursey, G.G., Edwards, T.W.D., and Frape, S.K. 1990. Hydrology and geochemistry studies, District of Keewatin, Northwest Territories, Canada. Fifth Canadian Permafrost Conference, Proceedings, Nordicana 54, 159-165.

Edwards, T.W.D. 1990. New contributions to isotope dendroclimatology from studies of plants. Geochimica et Cosmochimica Acta 54, 1843-1844.

Edwards, T.W.D., and McAndrews, J.H. 1989. Paleohydrology of a Canadian Shield lake inferred from ¹⁸O in sediment cellulose. Canadian Journal of Earth Sciences 26, 1850-1859.

Edwards, T.W.D., and Fritz, P. 1988. Stable isotope paleoclimate records for southern Ontario: comparison of results from marl and wood. Canadian Journal of Earth Sciences 25, 1397-1406.

Edwards, T.W.D., Klassen, R.A., and Shilts, W.W. 1987. Terrain geochemistry surveys, permafrost studies, and arctic limnology, District of Keewatin, N.W.T., Canada: implications for water quality monitoring in the North. Water Pollution Research Journal of Canada 22, 505-517.

Edwards, T.W.D., and Fritz, P. 1986. Assessing meteoric water composition and relative humidity from ¹⁸O and ²H in wood cellulose: paleoclimatic implications for southern Ontario, Canada. Applied Geochemistry 1, 715-723.  pdf

Edwards, T.W.D., Aravena, R.O., Fritz, P., and Morgan, A.V. 1985. Interpreting paleoclimate from ¹⁸O and ²H in plant cellulose: comparison with evidence from fossil insects and relict permafrost in southwestern Ontario. Canadian Journal of Earth Sciences 22, 1720-1726.

Updated 17.08.09