Biogeophysical effects of CO2-fertilization on global climate [electronic resource].
- Washington, D.C. : United States. Dept. of Energy, 2006.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
- Physical Description:
- PDF-file: 24 pages; size: 0.3 Mbytes
- Additional Creators:
- Lawrence Berkeley National Laboratory
United States. Department of Energy
United States. Department of Energy. Office of Scientific and Technical Information
- CO₂-fertilization affects plant growth, which modifies surface physical properties, altering the surface albedo, and fluxes of sensible and latent heat. We investigate how such CO₂-fertilization effects on vegetation and surface properties would affect the climate system. Using a global three-dimensional climate-carbon model that simulates vegetation dynamics, we compare two multi-century simulations: a ''Control'' simulation with no emissions, and a ''Physiol-noGHG'' simulation where physiological changes occur as a result of prescribed CO₂ emissions, but where CO₂-induced greenhouse warming is not included. In our simulations, CO₂-fertilization produces warming; we obtain an annual- and global-mean warming of about 0.65 K (and land-only warming of 1.4 K) after 430 years. This century-scale warming is mostly due to a decreased surface albedo associated with the expansion of the Northern Hemisphere boreal forests. On decadal time scales, the CO₂ uptake by afforestation should produce a cooling effect that exceeds this albedo-based warming; but if the forests remain in place, the CO₂-enhanced-greenhouse effect would diminish as the ocean equilibrates with the atmosphere, whereas the albedo effect would persist. Thus, on century time scales, there is the prospect for net warming from CO₂-fertilization of the land biosphere. Further study is needed to confirm and better quantify our results.
- Published through SciTech Connect.
Tellus B, vol. 58B, n/a, November 1, 2006, pp. 620-627 FT
Phillips, T J; Bala, G; Mirin, A; Caldeira, K; Delire, C; Wickett, M.
- Funding Information:
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