A significant loss of nitrogen in agriculture systems is through the volatilization of ammonia. This poster will describe and evaluate the Flow of Agricultural Nitrogen (FAN), a new feature in ELM that integrates the volatilization of ammonia from synthetic and manure fertilizer applications in agriculture systems. FAN includes detailed representation of physical and agricultural processes, differentiates between different sources of volatilization losses (i.e., animal housing, manure storage, and grazing pastures), and updates the ELM fertilizer application with gridded synthetic nitrogen and phosphorous input data and new manure applications. The volatilization of ammonia in FAN can support coupling to the biogeochemistry, feedback to the atmosphere model, or both. However, in the default configuration of FAN, only ammonia emissions are calculated with no interaction between model components. Globally, total emission estimates of agricultural ammonia are about 48 Tg N yr-1., with about 35 Tg N yr-1 coming from manure and 12 Tg N yr-1 from synthetic fertilizers, which is comparable with other studies using this model, but still higher than other global estimates.
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