Sulfur chemistry in the National Center for Atmospheric Research Community Climate Model: Description, evaluation, features, and sensitivity to aqueous chemistry

Sulfur chemistry has been incorporated in the National Center for Atmospheric Research Community Climate Model in an internally consistent manner with other parameterizations in the model. The model predicts mixing ratios of dimethylsulfide (DMS), SO 2 , SO 4 2 , H 2 O 2 . Processes that control the mixing ratio of these species include the emissions of DMS and SO 2 , transport of each species, gas- and aqueous-phase chemistry, wet deposition, and dry deposition of species. Modeled concentrations agree quite well with observations for DMS and H 2 O 2 , fairly well for SO 2 , and not as well for SO 4 2 The modeled SO 4 2- tends to underestimate observed SO 4 2- at the surface and overestimate observations in the upper troposphere. The SO 2 and SO 4 2- species were tagged according to the chemical production pathway and whether the sulfur was of anthropogenic or biogenic origin. Although aqueous-phase reactions in cloud accounted for 81% of the sulfate production rate, only ∼50-60% of the sulfate burden in the troposphere was derived from cloud chemistry. Because cloud chemistry is an important source of sulfate in the troposphere, the importance of H 2 O 2 concentrations and pH values was investigated. When prescribing H 2 O 2 concentrations to clear-sky values instead of predicting H 2 O 2 , the global-averaged, annual-averaged in-cloud production of sulfate increased. Setting the pH of the drops to 4.5 also increased the in-cloud production of sulfate. In both sensitivity simulations, the increased in-cloud production of sulfate decreased the burden of sulfate because less SO 2 was available for gas-phase conversion, which contributes more efficiently to the tropospheric sulfate burder than does aqueous-phase conversion.

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