Monday, 10 January 2000: 11:30 AM
The global tropospheric sulfur cycle, including SO2,
SO2-4, MSA, and DMS,
has been simulated by a global three-dimensional
chemistry-transport model (CTM). The model includes
emissions, gas and aqueous chemistry, transport, turbulent
mixing in the PBL, and wet/dry deposition, and can use
meteorological fields provided by GCM outputs,
or output from a numerical weather prediction
model run in forecast mode. We demonstrate the use of the
model to represent accurately the global sulfur cycle,
including comparison of model data with surface time series,
deposition fluxes, MSA/nss-SO2-4 molar ratios, and
prior estimates of the global sulfur budget. We compare
results from a simplified sulfur oxidation scheme using
stored oxidant fields (OH, O3, H2O2, NO3)
to results using a more detailed CH4-CO-NOx-SOx
photochemical model for gas-phase chemistry. These tests show
the good and bad points of the global CTM simulation of the sulfur sycle.
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