HR: 0800h
AN: A11C-0603    [Abstracts]
TI: Impact of Siberian forest fires on tropospheric ozone in East Asia during May 2003
AU: * Jeong, J
EM: ss99@snu.ac.kr
AF: School of Earth and Environmental Science, Seoul National University, Seoul, 151-747, Korea, Republic of
AU: Park, R
EM: rjpark@snu.ac.kr
AF: School of Earth and Environmental Science, Seoul National University, Seoul, 151-747, Korea, Republic of
AB: Forest fire is one of the major sources of CO, VOC, NOx and aerosols in the atmosphere. During the spring of 2003, intensive forest fires occurred in Siberia, the largest seen in the last 10 years. The smoke plumes from these forest fires heavily affected East Asia as indicated by aerosol optical depth retrieved from Total Ozone Mapping Spectrometer (TOMS). Previous studies showed a significant influence of those fires on aerosol concentrations in surface air over East Asia. However, influences of them on O3 concentrations on monthly and daily time scales have not been quantified yet. We use a global 3-D chemical transport model (GEOS-Chem) driven by assimilated meteorological data to examine the impact of Siberian forest fires on O3 concentrations in East Asia. The model simulations use a global biomass burning emission inventory constrained by satellite observations in 2003. Fire influence on O3 concentrations in East Asia is determined by the difference between the baseline and sensitivity simulations without Siberian fire emission. A model evaluation is also conducted using O3 observations at Acid Deposition Monitoring Network in East Asia (EANET) sites in East Asia. Simulated increase in O? concentrations due to fire emissions in the model appears to be consistent with an observed increase in O3 concentrations in May 2003 relative to other years. Fire emissions and their long-range transport thus could be important for the year-to-year variability of seasonal O3 concentrations over East Asia. Continuing increases in forest fires as a result of climate warming may have a significant impact on future air quality in East Asia.
DE: 0365 Troposphere: composition and chemistry
DE: 0368 Troposphere: constituent transport and chemistry
SC: Atmospheric Sciences [A]
MN: 2007 Fall Meeting