Our dear friend and colleague Dan Riseborough passed away on 26 December 2013 at the age of 58. Dan was an accomplished permafrost scientist and an integral part of the permafrost research group in Ottawa. He took all his degrees at Carleton University, with theses supervised by Michael Smith. He spent two summers in the field at Mayo, Yukon, in the 1980s, and worked for several years as a project manager for the Canada-France Ground Freezing Project both in Caen, Normandy, and at home here in Ottawa. In 2001 he joined the permafrost group at the Geological Survey of Canada. As a permafrost scientist Dan was best known nationally and internationally for his superb analytical skills and modelling expertise. He was a leader in the field of permafrost thermal modelling and this expertise combined with his knowledge of processes in permafrost environments and experience in field-based research have advanced our understanding of the impacts of climate change on the permafrost environment. Dan authored several key scientific papers and was also an editor of The Cryosphere. His chief contribution, with Mike Smith, was publication of the TTOP model for climate-permafrost interaction, and its application to explain the distribution of permafrost across Canada. A lesser known paper, published in 1993, presented a remarkable approach to simulating permafrost dynamics under climate change, showing that permafrost may grow more quickly than it may degrade under an equilibrium, but randomly varying, climate. His friends and family remember him for his excellent selection of gadgets and tools for tasks ranging from baking pies, or fixing bikes to conducting a research project. He was a kind-hearted and humble man with a brilliant mind, always willing to help others. His sense of humour was always welcome in the field and around the office. Dan will be greatly missed by his colleagues in Ottawa and throughout the permafrost community.
Sharon Smith and Steve Wolfe, Geological Survey of Canada, Ottawa
Chris Burn, Carleton University, Ottawa
Dan Riseborough Bibliography (Peer-reviewed literature)
Riseborough, D.W., M.W. Smith, and D.H. Halliwell. 1983. Determination of the thermal properties of frozen soils. Proceedings, Fourth International Conference on Permafrost, 17-22 July 1983, Fairbanks, AK. Washington, D.C.: National Academy Press. Vol. 1, pp. 1072-1077.
Smith, M.W., and D.W. Riseborough. 1983. Permafrost sensitivity to climatic change. Proceedings, Fourth International Conference on Permafrost, 17-22 July 1983, Fairbanks, AK. Washington, D.C.: National Academy Press. Vol. 1, pp. 1178-1183.
Smith, M.W., and D.W. Riseborough. 1985. The sensitivity of thermal predictions to assumptions in soil properties. Proceedings, Fourth International Symposium on Ground Freezing, 5-7 August 1985, Sapporo, Japan. Rotterdam: Balkema. Vol. 1, pp. 17-23.
Riseborough, D.W., and C.R. Burn. 1988. Influence of an organic mat on the active layer. Proceedings, Fifth International Conference on Permafrost, 2-5 August 1988, Trondheim, Norway. Trondheim: Tapir. Vol. 1, pp. 633-638.
Burgess, M.M., and Riseborough, D.W. 1990. Observations on the thermal response of discontinuous permafrost terrain to development and climate change - an 800 km transect along the Norman Wells pipeline. In Proceedings of the Fifth Canadian Permafrost Conference. June 1990, Quebec City, QC. Québec City: Centre d’études nordiques. Nordicana 54 : 291-297.
Riseborough, D.W. 1990. Soil latent heat as a filter of the climate signal in permafrost. Proceedings, Fifth Canadian Permafrost Conference, June 1990, Quebec City, QC. Québec City: Centre d’études nordiques. Nordicana 54: 199-205.
Riseborough, D.W., and M.W. Smith. 1993. Modelling permafrost response to climate change and climate variability. Proceedings, Fourth International Symposium on Thermal Engineering and Science for Cold Regions, Hanover, NH. US Army Cold Regions Research and Engineering Laboratory, Special Report 93-22. pp. 179-187.
Riseborough, D.W., P.J. Williams, and M.W. Smith. 1993. Pipelines buried in freezing soil: a comparison of two ground-thermal conditions. Proceedings, 12th International Conference on Offshore Mechanics and Arctic Engineering, 20-24 June 1993, Glasgow, Scotland. New York, NY: American Society of Mechanical Engineers. pp. 187-193.
Williams, P.J., D.W. Riseborough, and M.W. Smith. 1993. The France-Canada joint study of deformation of an experimental pipe line by differential frost heave. International Journal of Offshore and Polar Engineering, 3: 56-60.
Ladanyi, B, M.W. Smith and D.W. Riseborough, 1996. Assessing the climate warming effects on permafrost engineering. Proceedings, 49th Canadian Geotechnical Conference, Sept 23-25, 1996, St. Johns, Newfoundland. pp. 295-302.
Smith, M.W., and D.W. Riseborough. 1996. Permafrost monitoring and detection of climate change. Permafrost and Periglacial Processes, 7: 301-309.
Riseborough, D.W. and M.M. Burgess. 1996. Measurement interval and accurate assessment of ground temperature trends. Permafrost and Periglacial Processes, 7: 321-335.
Riseborough, D.W., and M.W. Smith. 1998. Exploring the limits of permafrost. Proceedings, Seventh International Conference on Permafrost, 23-27 June 1998, Yellowknife, NWT. Quebec City: Centre d’études nordiques, Nordicana 57: 935-941.
Smith, M.W., and D.W. Riseborough. 1998. Permafrost monitoring and detection of climate change – a reply. Permafrost and Periglacial Processes, 9: 91-92.
Williams, P.J., W.G. Rees, D.W. Riseborough and T.L. White, 2000. Strategies for development of cost-effective amelioration procedures for oil spills in cold regions. in Grant, S.A. and H. Iskandar (editors) Contaminant Hydrology: Cold Regions Modelling. pp. 39-58. CRC Press, Boca Raton Florida.
Smith, M.W., and D.W. Riseborough. 2002.Where on earth is permafrost? Boundaries and transitions. Geojournal Library, 68: 121-139.
Smith, M.W., and D.W. Riseborough. 2002. Climate and the limits of permafrost: A zonal analysis. Permafrost and Periglacial Processes, 13: 1-15. DOI: 10.1002/ppp.410.
Riseborough, D.W. 2002. The mean annual temperature at the top of permafrost, the TTOP model, and the effect of unfrozen water. Permafrost and Periglacial Processes, 13: 137-143. DOI: 10.1002/ppp.418.
Riseborough, D.W. 2003. Thawing and freezing indices in the active layer. Proceedings, Eighth International Conference on Permafrost, July 2003, Zurich, Switzerland. Lisse: Balkema. Vol. 2, pp. 953-958.
Chen, W.J., Y. Zhang, J. Cihlar, S.L. Smith, D.W. Riseborough. 2003. Changes in soil temperature and active layer thickness during the twentieth century in a region in western Canada. Journal of Geophysical Research – Atmospheres, 108: 4696. DOI: 10.1029/2002JD003355
Smith, S.L., M.M. Burgess, D.W. Riseborough, and F.M. Nixon. 2005. Recent trends from Canadian permafrost thermal monitoring network sites. Permafrost and Periglacial Processes, 16: 19-30. DOI: 10.1002/ppp.511.
Zhang, Y., W.J. Chen, S.L. Smith, D.W. Riseborough, and J. Cihlar. 2005. Soil temperature in Canada during the twentieth century: complex responses to atmospheric change. Journal of Geophysical Research – Atmospheres, 110, D01105. DOI: 10.1029/2004JD004910
Riseborough D.W. 2006. Discussion of C.R. Burn’s “Lake-bottom thermal regimes, western Arctic coast, Canada”. Permafrost and Periglacial Processes, 17: 87-89. DOI: 10.1002/ppp.534
Zhang, Y., W.J. Chen, and D.W. Riseborough. 2006. Temporal and spatial changes of permafrost in Canada since the end of the Little Ice Age. Journal of Geophysical Research – Atmospheres, 111, D22103. DOI: 10.1029/2006JD007284
Riseborough, D.W. 2007. The effect of transient conditions on an equilibrium permafrost-climate model. Permafrost and Periglacial Processes, 18: 21-32. DOI: 10.1002/ppp.518.
Zhang, Y., W.J. Chen, and D.W. Riseborough. 2008. Disequilibrium response of permafrost thaw to climate warming in Canada over 1850-2100. Geophysical Research Letters, 32: L02502. DOI: 10.1029/2007GL032117
Zhang, Y., W.J. Chen, and D.W. Riseborough. 2008. Transient projections of permafrost distribution in Canada during the 21st century under scenarios of climate change. Global and Planetary Change, 60: 443-456. DOI: 10.1016/j.gloplacha.2007.05.003
Riseborough, D., Shiklomanov, N., Etzelmuller, B., Gruber, S., and Marchenko, S. 2008. Recent advances in permafrost modelling. Permafrost and Periglacial Processes, 19(2): 137-156.
Riseborough, D.W. 2008. Estimating active layer and talik thickness from temeprature data: implications from modeling results. In Ninth International Conference on Permafrost. Edited by D.L. Kane and K.M. Hinkel. Fairbanks, Alaska. Institute of Northern Engineering, University of Alaska Fairbanks, Vol.2, pp. 1487-1492.
Smith, S.L., M.M. Burgess, and D.W. Riseborough. 2008. Ground temperature and thaw settlement in frozen peatlands along the Norman Wells pipeline corridor, NWT Canada: 22 years of monitoring. Proceedings, Ninth International Conference on Permafrost, July 2008, Fairbanks, AK. Fairbanks: Institute of Northern Engineering. Vol. 2, pp. 1665-1670.
Zhang, Y., Chen, W., and Riseborough, D.W. 2008. Modeling long-term dynamics of snow and their impacts on permafrost in Canada. In Ninth International Conference on Permafrost. Edited by D.L. Kane and K.M. Hinkel. Fairbanks, Alaska. Institute of Northern Engineering, University of Alaska Fairbanks, Vol.2, pp. 2055-2060.
Smith, S.L., S.A. Wolfe, D.W. Riseborough, and F.M. Nixon. 2009. Active-layer characteristics and summer climatic indices, Mackenzie valley, Northwest Territories, Canada. Permafrost and Periglacial Processes, 20: 201-220. DOI: 10.1002/ppp.651
Kokelj, S.V., Riseborough, D., Coutts, R., and Kanigan, J.C.N. 2010. Permafrost and terrain conditions at northern drilling-mud sumps: Impacts of vegetation and climate change and the management implications. Cold Regions Science and Technology, 64(1): 46-56.
Smith, S.L., and D.W. Riseborough. 2010. Modelling the thermal response of permafrost terrain to right-of-way disturbances and climate warming. Cold Regions Science and Technology, 60: 92-103.
Riseborough, D., Wolfe, S., and Duchesne, C. 2012. Simplified climate statistics for permafrost modeling: Yellowknife case study. In Proceedings Tenth International Conference on Permafrost. Edited by K.M. Hinkel. Salekhard, Yamal-Nenets Autonomous District, Russia, Vol.1, pp. 335-340.