The relationship of sulfur emissions to sulfate in precipitation-III. subregional budget analysis

A climatological box model is applied to each state in the eastern United States in order to infer the extent of interstate sulfur transport. Measured wet S deposition and dry period durations are input for the model. Exponential distributions are applied to calculate dry loss and boundary fluxes. We find that for every state, a significant fraction of S in wet deposition in the state originates elsewhere. Furthermore, for each northeastern state, 60-99% of the wet S is of external origin. For the northeastern states in aggregate plus Pennsylvania, 50-75% of the wet-deposited sulfur originates outside the region.