Publication: Effects of bottom boundary placement on subsurface heat storage: Implications for climate model simulations
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2007-01-18
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American Geophysical Union
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[1] A one-dimensional soil model is used to estimate the influence of the position of the bottom boundary condition on heat storage calculations in land-surface components of General Circulation Models (GCMs). It is shown that shallow boundary conditions reduce the capacity of the global continental subsurface to store heat by as much as 1.0 x 10^23 Joules during a 110-year simulation with a 10 m bottom boundary. The calculations are relevant for GCM projections that employ land-surface components with shallow bottom boundary conditions, typically ranging between 3 to 10 m. These shallow boundary conditions preclude a large amount of heat from being stored in the terrestrial subsurface, possibly allocating heat to other parts of the simulated climate system. The results show that climate models of any complexity should consider the potential for subsurface heat storage whenever choosing a bottom boundary condition in simulations of future climate change.
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Copyright 2007 by the American Geophysical Union. This research was funded by the Natural Sciences and Engineering Research Council of Canada (NSERC), the Atlantic Innovation Fund (AIF-ACOA), project CGL2005-06097 of the Spanish MEC, NSF grants from the Office of Polar Programs (OPP- 0436118), the division of Environmental Biology (Arctic LTER Project), a Biocomplexity Award (ATM-0439620), and by NASA’s Global Modeling and Analysis Program RTOP 622-24-47. J. E. Smerdon was supported by a Lamont-Doherty Postdoctoral Fellowship and by CICAR grant NA03OAR4320179 P 20A. JFGR was supported by a Ramón y Cajal contract.
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