Measurements and Modeling to Enhance Estimates of NH3 Total Deposition

Values for the total (wet + dry) deposition of ammonia are needed as input to nitrogen budget studies and ecological assessments. Concentrations of ammonia are measured at NADP’s Ammonia Monitoring Network (AMoN) sites. Research is focusing on the use of the concentration values from AMoN in the NADP maps of total deposition and also in the development of deposition values for AMoN sites. The presentation presents research efforts underway to develop a bidirectional flux model for use at AMoN sites and measurement studies being done to support model development and use of the AMoN data in NADP’s total deposition maps.