February 28, 2007
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FROM VOLUME 5, NUMBER 11, NOVEMBER 1992
TREND ANALYSIS: BOREHOLE TEMPERATURE TRENDS
"Geothermal Evidence from Canada for a Cold Period before Recent
Climatic Warming," K. Wang (Pac. Geosci. Ctr., Geol. Survey Canada, Sidney,
B.C. V8L 4B2, Can.), T.J. Lewis, Science, 256(5059), 1003-1005,
May 15, 1992.
High-accuracy temperature logs from three deep boreholes in a small area of
Quebec show that recent climatic warming was preceded by a cold period near the
end of the 19th century in that area. This result is consistent with results
from other areas in Canada.
"Underground Temperature Fields and Changing Climate: Evidence from
Cuba," V. Cermák (Geophys. Inst., Czech. Acad. Sci., 141-31 Prague
4, Czech.), L. Bodri, J. Safanda, Global Planet. Change, 5(4),
Application of heat conduction theory to data from 30 boreholes distributed
within Cuba consistently shows a surface warming of 2-3 ° C during the
last 200-300 years. The climatic effect has been possibly combined with the
influence of forest clearing in most areas 100-200 years ago.
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