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Creator:: Harris, Robert N. and Chapman, David S.
Abstract:: We construct a mid-latitude (30° – 60° N) reduced temperature-depth profile from a global borehole temperature database compiled for climate reconstruction. This reduced temperature profile is interpreted in terms of past surface ground temperature change and indicates warming on the order of 1°C over the past 100 to 200 years....
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Full Text:: been to use Bayesian inverse theory [Shen and Beck, 1991; Wang, 1992; Huang et al., 2000]. A principal

Creator:: Roy, Sukanta, Harris, Robert N., Rao, R. U. M., and Chapman, David S.
Abstract:: Temporal variations in surface ground temperature impart a signal to the subsurface thermal regime that is captured in borehole temperature-depth profiles. Seventy temperature-depth profiles in India, located between 12° and 28°N, are analyzed to infer past changes in ground temperature. These profiles exhibit predominantly positive anomalous temperatures relative to the...
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Full Text:: many inversion techniques have been developed for this problem [Shen and Beck, 1991, 1992; Clow, 1992

Creator:: Beltrami, Hugo, Ferguson, Grant, and Harris, Robert N.
Abstract:: Underground temperatures contain a record of past changes in the energy balance at the Earth's surface, such that borehole temperature data can be used to reconstruct long‐term trends of ground surface temperature (GST) changes. In addition to surface air temperature, however, GST is the response of the ground to other...
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Full Text:: . Beltrami, H., and L. Kellman (2003), An examination of short- and long- term air-ground temperature

Creator:: Bartlett, Marshall G., Chapman, David S., and Harris, Robert N.
Abstract:: Observations of air and ground temperatures collected between 1993 and 2004 from Emigrant Pass Geothermal Climate Observatory in northwestern Utah are analyzed to understand the relationship between these two quantities. The influence of surface air temperature (SAT), incident solar radiation, and snow cover on surface ground temperature (SGT) variations are...
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Full Text:: O U R N A L O F C L I M A T E VOLUME 19 © 2006 American Meteorological Society JCLI3808 ing

Creator:: Harris, Robert N. and Chapman, David S.
Abstract:: We construct an extratropical reduced temperature–depth profile for land areas north of 20°N latitude from the global borehole temperature database compiled for climate reconstruction. The mean reduced temperature profile compares well with a time series constructed from an initial baseline temperature (0.6° ± 0.1°C) and the last 140 years of...
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Full Text:: F04003 References Baker, D. G., and D. L. Ruschy (1993), The recent warming in eastern Minnesota shown

Creator:: Harris, Robert N.
Abstract:: The POM-SAT model for comparing air and ground temperatures is based on the supposition that surface air temperature (SAT) records provide a good prediction of thermal transients in the shallow subsurface of the Earth. This model consists of two components, the forcing function and an initial condition, termed the pre-observational...
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Full Text:: . G. and Ruschy, D. L.: The recent warming in Eastern Minnesota shown by ground temperatures, Geophys

Creator:: Davis, Michael G., Harris, Robert N., and Chapman, David S.
Abstract:: Borehole temperature profiles provide a record of ground surface temperature (GST) change at the decadal to centennial time scale. GST histories reconstructed from boreholes are particularly useful in climate reconstruction if changes in GST and surface air temperature (SAT) are effectively coupled at decadal and longer time periods and it...
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Full Text:: temperature change at time zero is largely captured within a depth called the thermal length, l, l

Creator:: Bartlett, Marshall G., Chapman, David S., and Harris, Robert N.
Abstract:: Changes in snow’s influence on surface ground temperature (SGT) could create a bias in the borehole temperature record of climate change. Using a snow-ground thermal model which predicts changes in the mean annual offset between SGT and surface air temperature (SAT), we calculate the response of SGT to changes in...
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Full Text:: conductivity k W m�1 K�1 0.8 0.2 Density r kg m�3 1350 300 Specific heat C J kg�1 K�1 1000 2090 Latent heat L J

Creator:: Harris, Robert N., Bartlett, Marshall G., and Chapman, David S.
Abstract:: [1] Borehole temperature-depth profiles contain a record of surface ground temperature (SGT) changes with time and complement surface air temperature (SAT) analysis to infer climate change over multiple centuries. Ground temperatures are generally warmer than air temperatures due to solar radiation effects in the summer and the insulating effect of...
Resource Type:: Article
Full Text:: the volumetric heat capacity, C, L is latent heat, and f(T) is the homographic function developed by

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