Articles | Volume 13, issue 3
https://doi.org/10.5194/gmd-13-1663-2020
https://doi.org/10.5194/gmd-13-1663-2020
Model evaluation paper
 | 
31 Mar 2020
Model evaluation paper |  | 31 Mar 2020

Lower boundary conditions in land surface models – effects on the permafrost and the carbon pools: a case study with CLM4.5

Ignacio Hermoso de Mendoza, Hugo Beltrami, Andrew H. MacDougall, and Jean-Claude Mareschal

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Cited articles

Alexeev, V., Nicolsky, D., Romanovsky, V., and Lawrence, D.: An evaluation of deep soil configurations in the CLM3 for improved representation of permafrost, Geophys. Res. Lett., 34, 9, https://doi.org/10.1029/2007GL029536, 2007. a, b, c
Anderson, E. A.: A point energy and mass balance model of a snow cover, NOAA Technical Report NWS, 19, 1976. a
Avis, C. A., Weaver, A. J., and Meissner, K. J.: Reduction in areal extent of high-latitude wetlands in response to permafrost thaw, Nat. Geosci., 4, 444, https://doi.org/10.1038/NGEO1160, 2011. a
Beltrami, H., Smerdon, J., Pollack, H. N., and Huang, S.: Continental heat gain in the global climate system, Geophys. Res. Lett., 29, 1–3, https://doi.org/10.1029/2001GL014310, 2002. a
Bonan, G. B.: Forests and climate change: forcings, feedbacks, and the climate benefits of forests, Science, 320, 1444–1449, https://doi.org/10.1126/science.1155121, 2008. a
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Short summary
We study the impact that the thickness of the subsurface and the geothermal gradient have in land models for climate simulations. To do this, we modify the Community Land Model version 4.5. In a scenario of rising atmospheric temperatures, the temperature of an insufficiently deep subsurface rises faster than it would in the real land. For the model, this produces faster permafrost thawing and increased emissions of land carbon to the atmosphere.