We wish to thank D. Blackwell and V. Cermak for helpful reviews of the initial manuscript.
Beck, A. E., , P. Y. Shen, , H. Beltrami, , J-C. Mareschal, , J. Safanda, , M. N. Sebagenzi, , G. Vasseur, , and K. Wang. 1992. A comparison of five different analyses in the interpretation of five borehole temperature data sets. Global Planet. Change 6:101–112.
Beltrami, H., , A. M. Jessop, , and J-C. Mareschal. 1992. Ground temperature histories in eastern and central Canada from geothermal measurements: Evidence of climatic change. Global Planet. Change 6:167–184.
Blackwell, D. D., , J. L. Steele, , and C. A. Brott. 1980. The terrain effect on terrestrial heat flow. J. Geophys. Res. 85:4757–4772.
Cermak, V. 1971. Underground temperature and inferred climatic temperature of the last millennium. Palaeogeogr. Palaeoclimatol. Palaeoecol. 10:1–19.
Cermak, V., , L. Bodri, , and J. Safanda. 1992. Underground temperature fields and changing climate: Evidence from Cuba. Global Planet. Change 6:325–337.
Gosnold, W. D., , P. E. Todhunter, , and W. Schmidt. 1997. The borehole temperature record of climate warming in the mid-continent of North America. Global Planet. Change 15:33–45.
Guillou-Frottier, L., , J-C. Mareschal, , and J. Musset. 1998. Ground surface temperature history in central Canada inferred from 10 selected borehole temperature profiles. J. Geophys. Res. 103:7385–7397.
Judge, A. S. 1973. The thermal regime of the MacKenzie Valley: Observations of the natural state. Environmental-Social Committee, Northern Pipelines, Task Force on Northern Oil Development, Rep. No. 73–38, Information Canada, Ottawa, Canada, 177 pp.
Kukkonen, I. T. 1987. Vertical variation of apparent and palaeoclimatically corrected heat flow densities in the central Baltic Shield. J. Geodyn. 8:33–53.
Lachenbruch, A. H., and B. V. Marshall. 1986. Changing climate: Geothermal evidence from permafrost in the Alaskan Arctic. Science 234:689–696.
Lewis, T. J., and K. Wang. 1998. Geothermal evidence for deforestation induced warming: Implications for the climatic impact of land development. Geophys. Res. Lett. 25:535–538.
Majorowicz, J. A., and J. Safanda. 1998. Ground surface temperature history from inversions of underground temperatures—A case study of the Western Canadian Sedimentary Basin. Tectonophysics 291:287–298.
Pollack, H., , S. Huang, , and P-Y. Shen. 1998. Climate change record in subsurface temperatures: A global perspective. Science 282:279–281.
Roy, R. F., , D. D. Blackwell, , and E. R. Decker. 1972. Continental heat flow, in The Nature of the Solid Earth, edited by E. C. Robertson, McGraw-Hill, New York, 506–543.
Shen, P. Y., , K. Wang, , H. Beltrami, , and J-C. Mareschal. 1992. A comparative study of inverse methods for estimating climatic history from borehole temperature data. Global Planet. Change 6:113–127.
Shen, P. Y., , H. N. Pollack, , and S. Huang. 1996. Inference of ground surface temperature history from borehole temperature data: A comparison of two inverse methods. Global Planet. Change 14:49–57.
Vincent, L. 1998. A technique for the identification of inhomogeneities in Canadian temperature series. J. Climatol. 11:1094–1104.
Vincent, L. A., and D. W. Gullett. 1999. Canadian historical and homogeneous temperature datasets for climate change analyses. International Journal of Climatology 19:1375–1388.
Wang, K., , T. J. Lewis, , and A. M. Jessop. 1992. Climatic changes in central and eastern Canada inferred from deep borehole temperature data. Global Planet. Change 6:129–141.
Wang, K., , T. J. Lewis, , D. S. Belton, , and P. Y. Shen. 1994. Differences in recent ground surface warming in eastern and western Canada: Evidence from borehole temperatures. Geophys. Res. Lett. 21:2689–2692.
Zeimer, R. R. 1964. Summer evapotranspiration trends as related to time after logging of forests in Sierra Nevada. J. Geophys. Res. 69:615–620.