HR: 16:20h
AN: A44A-01 INVITED     [Abstracts]
TI: Extreme Global Warming and Local Cooling Due to Aerosol Particles
AU: * Jacobson, M Z
EM: jacobson@stanford.edu
AF: Stanford University, Dept. of Civil and Env. Eng. Terman M-31, Stanford, CA 94305-4020, United States
AB: Fossil-fuel soot (FFS) aerosol particles are known to warm climate above the warming due to anthropogenic greenhouse gases (AGHG). Other anthropogenic aerosol particles (AAP) are also known to mask much of global warming. However, to date, no climate response study has treated the physical evolution of the mixing state of FFS from hydrophobic to hygroscopic or tracked FFS and other AAP through clouds and precipitation. Such a calculation reveals less cloud activation by newly-emitted FFS than other AAP, with increasing activation over time, consistent with data. Both strong atmospheric heating and reduced cloud activation by FFS causes it to enhance extreme global warming more than previously thought. All previous studies have also ignored the majority of chemicals in AAP, underestimating cooling. As such, previous studies of the historic climate record that have matched the temperature data have done so with offsetting errors. Since extreme global warming and localized cooling observed in the climate record are due to anthropogenic aerosol particles, control of FFS will reduce extreme warming.
DE: 0305 Aerosols and particles (0345, 4801, 4906)
DE: 0321 Cloud/radiation interaction
DE: 0360 Radiation: transmission and scattering
DE: 1626 Global climate models (3337, 4928)
DE: 3337 Global climate models (1626, 4928)
SC: Atmospheric Sciences [A]
MN: 2007 Joint Assembly