Climate change on the Colorado Plateau of eastern Utah inferred from borehole temperatures Public Deposited

http://ir.library.oregonstate.edu/concern/defaults/p5547s89g

copyrighted by American Geophysical Union

Descriptions

Attribute NameValues
Creator
Abstract or Summary
  • Temperature profiles from boreholes on the Colorado Plateau of southeastern Utah have been examined for evidence of climate change. Because these boreholes penetrate layered sedimentary rocks with different thermal conductivities, Bullard plots (Temperature versus integrated thermal resistance) are used to estimate background heat flow and surface temperature intercepts. Reduced temperatures, which represent departures from a constant heat flow condition, are inverted for a surface ground temperature history at each borehole site using a singular value decomposition algorithm. Singular value cutoffs are selected by analyzing the spectral energy and the standard deviation of the model fit to the data as a function of the number of eigenvalues; solutions are constructed from areas of large spectral energy and a cutoff where additional eigenvalues fail to improve the solution significantly. The solution is parameterized in terms of 13 time steps increasing in duration and going back 400 years. Eight of nine borehole sites indicate between 0.4 and O.8°C (±0.2°C) warming over the past 200 years with some evidence for accelerated warming in this century; one borehole indicates local cooling over the same time period. The amplitude of the warming inferred from borehole temperatures is less than that deduced from analysis of l00-year surface air temperature records at four of the five weather stations surrounding the borehole sites.
Resource Type
Date Available
Date Issued
Citation
  • Chapman, D. S., Harris, R. N., (1995) Climate change on the Colorado Plateau of eastern Utah inferred from borehole temperatures, J. Geophys. Res., 100, B4, 6367-6381.
Series
Rights Statement
Publisher
Language
Replaces
Additional Information
  • description.provenance : Approved for entry into archive by Linda Kathman(linda.kathman@oregonstate.edu) on 2010-05-26T16:02:32Z (GMT) No. of bitstreams: 1 Harris&Chapman_JGR95.pdf: 4380332 bytes, checksum: ff353004696864c9c04be46d2db9fa3b (MD5)
  • description.provenance : Submitted by Mary Phan (mpscanner@gmail.com) on 2010-05-25T22:48:00Z No. of bitstreams: 1 Harris&Chapman_JGR95.pdf: 4380332 bytes, checksum: ff353004696864c9c04be46d2db9fa3b (MD5)
  • description.provenance : Made available in DSpace on 2010-05-26T16:02:32Z (GMT). No. of bitstreams: 1 Harris&Chapman_JGR95.pdf: 4380332 bytes, checksum: ff353004696864c9c04be46d2db9fa3b (MD5) Previous issue date: 1995-04-10

Relationships

Parents:

This work has no parents.

Last modified

Downloadable Content

Download PDF

Items