HR: 1340h
AN: A53C-1353    [Abstracts]
TI: Source-Receptor Relationships for East Asian Sulfur Dioxide Emissions and Northern Hemisphere Sulfate Concentrations
AU: * Liu, J
EM: jliu@princeton.edu
AF: Princeton University, Woodrow Wilson School of Public and International Affairs, Princeton University, Princeton, NJ 08540, United States
AU: Mauzerall, D L
EM: mauzeral@Princeton.EDU
AF: Princeton University, Woodrow Wilson School of Public and International Affairs, Princeton University, Princeton, NJ 08540, United States
AU: Horowitz, L W
EM: Larry.Horowitz@noaa.gov
AF: Geophysical Fluid Dynamics Laboratory, GFDL/NOAA, Princeton, NJ 08540, United States
AB: We analyze the effect of varying East Asian (EA) sulfur emissions on sulfate concentrations in the northern hemisphere based on a global coupled oxidant-aerosol model (MOZART-2) driven with NCEP reanalysis meteorology for 1991. We conduct a base and several sensitivity simulations, in which sulfur emissions from each continent are tagged, to establish the source-receptor (S-R) relationship between EA sulfur emissions and sulfate concentrations over the source and downwind regions. We find that reducing EA SO2 emissions will significantly decrease the spatial extent of the EA sulfate influence over the North Pacific, but raising EA SO2 emissions will not significantly increase the spatial extent of influence. We define a linearity index and find the S-R relationship between EA SO2 emissions and EA sulfate concentrations to be nearly linear over most downwind regions, but to be non-linear over the EA source region, particularly at the surface and in winter. In addition, we find that besides the direct transport of EA sulfate to North America (NA) and Europe (EU), the indirect response of locally-produced NA or EU sulfate to changes in EA SO2 emissions is negative (i.e., offsetting the direct effect) in winter, spring and fall, but becomes positive in summer. In summer the indirect response is as important as direct transport of EA sulfate over the southeastern U.S. and southern EU. This summertime positive indirect effect largely results from induced changes in H2O2 oxidant concentrations over these regions.
DE: 0305 Aerosols and particles (0345, 4801, 4906)
DE: 0365 Troposphere: composition and chemistry
DE: 0368 Troposphere: constituent transport and chemistry
DE: 9320 Asia
DE: 9350 North America
SC: Atmospheric Sciences [A]
MN: 2007 Fall Meeting