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www.biogeosciences-discuss.net/7/565/2010/
doi:10.5194/bgd-7-565-2010
© Author(s) 2010. This work is distributed
under the Creative Commons Attribution 3.0 License.
Fire dynamics during the 20th century simulated by the Community Land Model
1Earth and Atmospheric Sciences, Cornell University, Ithaca, NY, USA
2Department of Earth System Science, University of California, Irvine, CA, USA
3Climate and Ecosystem Processes, Environmental Science Division, Oak Ridge National Laboratory, Oak Ridge, TN, USA
4Climate and Global Dynamics Division, National Center for Atmospheric Research, Boulder, CO, USA
5Department of Geography, University of Kansas, Lawrence, KA, USA
Abstract. Fire is an integral Earth System process that interacts with climate in multiple ways. Here we assessed the parametrization of fires in the Community Land Model (CLM-CN) and improved the ability of the model to reproduce contemporary global patterns of burned areas and fire emissions. In addition to wildfires we extended CLM-CN to account for fires related to deforestation. We compared contemporary fire carbon emissions predicted by the model to satellite based estimates in terms of magnitude, spatial extent as well as interannual and seasonal variability. Longterm trends during the 20th century were compared with historical estimates. Overall we found the best agreement between simulation and observations for the fire parametrization based on the work by Arora and Boer (2005). We obtain substantial improvement when we explicitly considered human caused ignition and fire suppression as a function of population density. Simulated fire carbon emissions ranged between 2.0 and 2.4 Pg C/year for the period 1997–2004. Regionally the simulations had a low bias over Africa and a high bias over South America when compared to satellite based products. The net terrestrial carbon source due to land use change for the 1990s was 1.2 Pg C/year with 11% stemming from deforestation fires. During 2000–2004 this flux decreased to 0.85 Pg C/year with a similar relative contribution from deforestation fires. Between 1900 and 1960 we simulated a slight downward trend in global fire emissions, which is explained by reduced fuels as a consequence of wood harvesting and partly by increasing fire suppression. The model predicted an upward trend in the last three decades of the 20th century caused by climate variations and large burning events associated with ENSO induced drought conditions.
Discussion Paper (PDF, 8680 KB) Interactive Discussion (Closed, 4 Comments) Final Revised Paper (BG)
Notice on Discussion StatusCitation: Kloster, S., Mahowald, N. M., Randerson, J. T., Thornton, P. E., Hoffman, F. M., Levis, S., Lawrence, P. J., Feddema, J. J., Oleson, K. W., and Lawrence, D. M.: Fire dynamics during the 20th century simulated by the Community Land Model, Biogeosciences Discuss., 7, 565-630, doi:10.5194/bgd-7-565-2010, 2010. Bibtex EndNote Reference Manager XML
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