HR: 11:15h
AN: A52B-04    [Abstracts]
TI: Sensitivity of global tropospheric O3 distribution and its radiative forcing to regional biomass burning emissions
AU: * Naik, V
EM: vnaik@princeton.edu
AF: Princeton University, Woodrow Wilson School of Public and International Affairs Robertson Hall, Princeton, NJ 08544 United States
AU: Mauzerall, D
EM: mauzeral@princeton.edu
AF: Princeton University, Woodrow Wilson School of Public and International Affairs Robertson Hall, Princeton, NJ 08544 United States
AU: Horowitz, L W
EM: larry.horowitz@noaa.gov
AF: Geophysical Fluid Dynamics Laboratory, NOAA, Princeton, USA 08542 United States
AU: Oppenheimer, M
EM: omichael@princeton.edu
AF: Princeton University, Woodrow Wilson School of Public and International Affairs Robertson Hall, Princeton, NJ 08544 United States
AU: Ramaswamy, V
EM: V.Ramaswamy@noaa.gov
AF: Geophysical Fluid Dynamics Laboratory, NOAA, Princeton, USA 08542 United States
AB: Anthropogenic biomass burning is a major source of air pollutants in the atmosphere. Emissions of ozone (O3) precursors - nitrogen oxides (NOx), carbon monoxide (CO), and non-methane hydrocarbons (NMHCs) from biomass burning have been shown to contribute significantly to O3 levels in the troposphere. For some regions (tropics, southern hemisphere) emissions of O3 precursors from biomass burning exceed emissions from industrial sources. Currently, O3, the third most important greenhouse gas, is not included in the Kyoto Protocol or any climate agreement mainly because of the complexity in estimating the contribution of individual countries to the global O3 distribution and the resulting climate forcing. In this study, we evaluate the sensitivity of global O3 distributions and their radiative impact to regional biomass burning emissions. We use the global chemistry transport model, MOZART-2, to simulate the O3 distribution for a 1990 base year and perturbations to this distribution caused by a 10 percent reduction in the base emissions of O3 precursors from biomass burning from Africa, North America, South America, Southeast Asia, and the Former Soviet Union. We then calculate the radiative forcing due to the reduced O3 column resulting from regional reductions in biomass burning emissions. We also evaluate changes in CH4 concentrations and associated radiative forcing resulting from the O3 changes. We will present a quantitative analysis of the contribution of regional biomass burning emissions to global O3 distribution and its radiative forcing and associated changes in CH4 concentrations and associated radiative forcing resulting from the O3 changes.
DE: 0360 Transmission and scattering of radiation
DE: 0365 Troposphere--composition and chemistry
DE: 6620 Science policy
SC: Atmospheric Sciences [A]
MN: 2005 Joint Assembly