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Ground temperature histories for central and eastern Canada from geothermal measurements: Little Ice Age signature
Author(s) -
Beltrami Hugo,
Mareschal JeanClaude
Publication year - 1992
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/92gl00671
Subject(s) - borehole , geology , ice core , geothermal gradient , climatology , period (music) , little ice age , atmospheric temperature , physical geography , climate change , geography , oceanography , geophysics , paleontology , physics , acoustics
Deep borehole temperature profiles have been analyzed to determine ground temperature histories in central and eastern Canada. Clear signs of a cold period between 1500 and 1800 A.D., corresponding to the little ice age, have been found. A warming trend after 1800 A.D. was detected throughout eastern and central Canada. Temperature profiles from western Ontario are consistent and were inverted simultaneously to yield a regional ground temperature history. The recent warming appears to be correlated with the increase of atmospheric CO 2 reported for a Greenland ice core.