HR: 17:20h
AN: A24C-06 INVITED     [Abstracts]
TI: Effects of Aerosols on the Climate and Ecosystem of Northern Eurasia: Results from Global Models
AU: * Collins, W D
EM: wcollins@ucar.edu
AF: National Center for Atmospheric Research, P.O. Box 3000, Boulder, CO 80307-3000 United States
AU: Washington, W M
EM: wmw@ucar.edu
AF: National Center for Atmospheric Research, P.O. Box 3000, Boulder, CO 80307-3000 United States
AU: Meehl, G A
EM: meehl@ucar.edu
AF: National Center for Atmospheric Research, P.O. Box 3000, Boulder, CO 80307-3000 United States
AB: Anthropogenic aerosols could significantly affect the surface energy budget, water cycle, and climate of northern Eurasia. These aerosols arise from consumption of fossil fuels and biofuels, initiation of forest fires, and the influence of humans on land surfaces. In this talk, we present three lines of evidence from global models that man-made aerosols have altered the surface properties and climate of northern Eurasia. The model results include coupled simulations of climate change during the 19th and 20th centuries, simulations of the present-day climate and aerosol radiative forcing, and analyses of the distribution and chemical speciation of aerosols. The coupled simulations illustrate the combined influence of greenhouse gases and aerosols on the surface energy budget, surface and soil temperatures, and soil moisture. The effects of anthropogenic aerosols are isolated using global models for the present-day climate. The changes in the direct and diffuse solar radiation in the boreal forest canopy are estimated from these integrations. The radiative forcings associated with individual species, including sulfate, dust, and carbonaceous aerosols, are estimated from global chemical transport models. We conclude by discussing prospects for enhancing global models to study the interaction of dynamic vegetation, climate, and the coupled carbon cycle of this region.
DE: 3322 Land/atmosphere interactions
DE: 3359 Radiative processes
DE: 0305 Aerosols and particles (0345, 4801)
DE: 0345 Pollution--urban and regional (0305)
SC: Atmospheric Sciences [A]
MN: 2004 AGU Fall Meeting