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www.atmos-chem-phys-discuss.net/7/4761/2007/
doi:10.5194/acpd-7-4761-2007
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Past and future scenarios of the effect of carbon dioxide on plant growth and transpiration for three vegetation types of southwestern France
CNRM/GAME (Météo-France, CNRS), Toulouse, France
Abstract. The sensitivity of an operational CO2-responsive land surface model (the ISBA-A-gs model of Météo-France) to the atmospheric CO2 concentration, [CO2], is investigated for 3 vegetation types (winter wheat, irrigated corn, coniferous forest). Past (1960) and future (2050) scenarios of [CO2] corresponding to 320 ppm and 550 ppm, respectively, are explored. The sensitivity study is performed for 4 annual cycles presenting contrasting conditions of precipitation regime and air temperature, based on continuous measurements performed on the SMOSREX site near Toulouse, in southwestern France. A significant CO2-driven reduction of canopy conductance is simulated for the irrigated corn and the coniferous forest. The reduction is particularly large for corn, from 2000 to 2050 (–18%), and triggers a drop in optimum irrigation (–30 mm y−1). In the case of wheat, the response is more complex, with an equal occurrence of enhanced or reduced canopy conductance.
Discussion Paper (PDF, 632 KB) Interactive Discussion (Closed, 3 Comments) Final Revised Paper (ACP)
Notice on Discussion StatusCitation: Calvet, J.-C., Gibelin, A.-L., Roujean, J.-L., Martin, E., Le Moigne, P., Douville, H., and Noilhan, J.: Past and future scenarios of the effect of carbon dioxide on plant growth and transpiration for three vegetation types of southwestern France, Atmos. Chem. Phys. Discuss., 7, 4761-4779, doi:10.5194/acpd-7-4761-2007, 2007. Bibtex EndNote Reference Manager XML
