MODELLING TEMPORAL VARIATIONS IN THE GLOBAL TROPOSPHERIC ARSENIC BURDEN

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Abstract

The response of the troposphere to anthropogenic mobilization of arsenic has been examined by inclusion of the troposphere in a seven reservoir global cycling model for arsenic. Mobilization was simulated from a steady-state condition by increasing the land efflux of arsenic with time according to present day observed arsenic concentrations in the troposphere. Simulations involved separation of low and high temperature pollutant processes, and restrictions in the magnitude of the low temperature source. The sensitivity of the model was also tested by subdividing the troposphere into marine and continental airmasses. The tropospheric burden of arsenic showed increases by factors from 2 to 10 over time scales varying from 8000 to 16,000 years. The elevation of the tropospheric burden was enhanced using the two airmass model, and these elevated levels were more persistent than for a single well-mixed troposphere.

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