Comparison of observed and general circulation model derived continental subsurface heat flux in the Northern Hemisphere



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MacDougall, Andrew H. and Beltrami, Hugo and González Rouco, J. Fidel and Stevens, M. Bruce and Bourlon, Evelise (2010) Comparison of observed and general circulation model derived continental subsurface heat flux in the Northern Hemisphere. Journal of geophysical research-atmospheres, 115 . ISSN 2169-897X

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Heat fluxes in the continental subsurface were estimated from general circulation model (GCM) simulations of the climate of the last millennium and compared to those obtained from subsurface geothermal data. Since GCMs have bottom boundary conditions (BBCs) that are less than 10 m deep and thus may be thermodynamically restricted in the continental subsurface, we used an idealized land surface model (LSM) with a very deep BBC to estimate the potential for realistic subsurface heat storage in the absence of bottom boundary constraints. Results indicate that there is good agreement between observed fluxes and GCM simulated fluxes for the 1780-1980 period when the GCM simulated temperatures are coupled to the LSM with deep BBC. These results emphasize the importance of placing a deep BBC in GCM soil components for the proper simulation of the overall continental heat budget. In addition, the agreement between the LSM surface fluxes and the borehole temperature reconstructed fluxes lends additional support to the overall quality of the GCM (ECHO-G) paleoclimatic simulations.

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Copyright 2010 by the American Geophysical Union. This research was supported by grants from the Canadian Foundation for Climate and Atmospheric Sciences (CFCAS), the Natural Sciences and Engineering Research Council of Canada (NSERC), and the Atlantic Innovation Fund (ACOA-AIF). A. H. M. D. and M. B. S. are grateful for their support received from NSERC as a PGS-M and a PGS-D respectively. JFGR acknowledges support from projects CGL2008-06558-C02-01, MMARM-200800050084028 and MMARM-20080005008354.

Uncontrolled Keywords:Soil-temperature; Climate system; Art.; Simulation; Canada
Subjects:Sciences > Physics > Astrophysics
Sciences > Physics > Astronomy
ID Code:36231
Deposited On:08 Mar 2016 16:19
Last Modified:10 Dec 2018 15:05

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