While the terrestrial biosphere plays important roles in the uptake, storage, and re-emission of atmospheric mercury (Hg), the details of terrestrial biogeochemical Hg cycling have received little attention in global models. Through uptake and oxidation of elemental Hg (Hg(0)) in leaf tissues, vegetation has been proposed as an important surface characteristic driving dry gaseous Hg(0) deposition to watersheds. Once incorporated into soils, the return flux of Hg back to the atmosphere is sensitive to spatially variable climate, redox conditions, and organic carbon dynamics. Soils are a significant legacy reservoir of anthropogenic Hg and understanding the timescales over which they redistribute and return Hg to the atmosphere is critical to understanding the global biogeochemical cycle. We will present recent results from an updated global terrestrial mercury model, featuring a revised parameterization for Hg dry deposition and bi-directional coupling with the GEOS-Chem global chemical transport model. We will then discuss the modeling constraints provided by observations from NADP Hg monitoring initiatives and will finish with discussion of the implications for modeled concentration and deposition patterns across the contiguous United States.