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Science 15 May 1992:
Vol. 256. no. 5059, pp. 1003 - 1005
DOI: 10.1126/science.256.5059.1003
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Articles

Geothermal Evidence from Canada for a Cold Period Before Recent Climatic Warming

Kelin Wang 1 and Trevor J. Lewis 1

1 Pacific Geoscience Center, Geological Survey of Canada, Sidney, British Columbia, Canada V8L 4B2

Three deep boreholes in a small area in Quebec, each having two high-accuracy temperature logs separated by 22 years, allow reliable determination of the ground surface temperature history during the past few centuries. The temperature logs show that the recent climatic warming was preceded by a cold period near the end of the 19th century in this area. The presence of such a cold period is also suggested by borehole temperature data from other areas in Canada.

Submitted on January 6, 1992
Accepted on March 12, 1992


THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
Climate Change Record in Subsurface Temperatures: A Global Perspective.
H. N. Pollack, S. Huang, and P. Shen (1998)
Science 282, 279-281
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Ice-flood history reconstructed with tree- rings from the southern boreal forest limit, western Quebec.
J. Tardif, J. Tardif, and Y. Bergeron (1997)
The Holocene 7, 291-300
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Climatic Warming in North America: Analysis of Borehole Temperatures.
D. Deming and D. Deming (1995)
Science 268, 1576-1577
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