HR: 14:15h
AN: B33F-03    [Abstracts]
TI: Cropland Management Effects on Local and Global Climate
AU: * Lobell, D
EM: dlobell@llnl.gov
AF: Lawrence Livermore National Laboratory, P.O. Box 808 L-103, Livermore, CA 94550 United States
AU: Bala, G
EM: gbala@llnl.gov
AF: Lawrence Livermore National Laboratory, P.O. Box 808 L-103, Livermore, CA 94550 United States
AU: Duffy, P
EM: pduffy@llnl.gov
AF: Lawrence Livermore National Laboratory, P.O. Box 808 L-103, Livermore, CA 94550 United States
AB: Most research on the climate impacts of land use change has focused on conversion of land into or out of crop production. However, many management changes occuring within agricultural lands have potential consequences for climate. We evaluated the biogeophysical effects of different management-related changes in cropland surfaces, including increased productivity, cropping intensity, irrigation, and changes in soil albedo, on climate using the NCAR Community Atmosphere Model (CAM3). The impacts of management changes on radiative forcing, evapo-transpiration, and temperature can be significant in certain regions, with global effects that are comparatively small but significant. The magnitude of these biogeophysical effects relative to associated biogeochemical changes is discussed. In addition, the effects are compared to those associated with previous and ongoing land-cover change experiments.
DE: 0402 Agricultural systems
DE: 1622 Earth system modeling (1225)
DE: 1626 Global climate models (3337, 4928)
DE: 1632 Land cover change
SC: Biogeosciences [B]
MN: Fall Meeting 2005