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- W2074978085 abstract "We present a detailed evaluation of the atmospheric sulfur cycle simulated in the Georgia Tech/Goddard Global Ozone Chemistry Aerosol Radiation and Transport (GOCART) model. The model simulations of SO 2 , sulfate, dimethylsulfide (DMS), and methanesulfonic acid (MSA) are compared with observations from different regions on various timescales. The model agrees within 30% with the regionally averaged sulfate concentrations measured over North America and Europe but overestimates the SO 2 concentrations by more than a factor of 2 there. This suggests that either the emission rates are too high, or an additional loss of SO 2 which does not lead to a significant sulfate production is needed. The average wintertime sulfate concentrations over Europe in the model are nearly a factor of 2 lower than measured values, a discrepancy which may be attributed largely to the sea‐salt sulfate collected in the data. The model reproduces the sulfur distributions observed over the oceans in both long‐term surface measurements and short‐term aircraft campaigns. Regional budget analyses show that sulfate production from SO 2 oxidation is 2 to 3 times more efficient and the lifetimes of SO 2 and sulfate are nearly a factor of 2 longer over the ocean than over the land. This is due to a larger free tropospheric fraction of SO 2 column over the ocean than over the land, hence less loss to the surface. The North Atlantic and northwestern Pacific regions are heavily influenced by anthropogenic activities, with more than 60% of the total SO 2 originating from anthropogenic sources. The average production efficiency of SO 2 from DMS oxidation is estimated at 0.87 to 0.91 in most oceanic regions." @default.
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- W2074978085 date "2000-10-01" @default.
- W2074978085 modified "2023-10-11" @default.
- W2074978085 title "Atmospheric sulfur cycle simulated in the global model GOCART: Comparison with field observations and regional budgets" @default.
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- W2074978085 doi "https://doi.org/10.1029/2000jd900385" @default.
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