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THE FATE AND TRANSPORT OF AMMONIA AT THE LOCAL TO REGIONAL LEVEL
Citation:
DENNIS, R. L., R. MATHUR, D. B. SCHWEDE, J. T. WALKER, AND W. ROBARGE. THE FATE AND TRANSPORT OF AMMONIA AT THE LOCAL TO REGIONAL LEVEL. Presented at Workshop on Agricultural Air Quality: State of the Science, Potomac, MD, June 05 - 08, 2006.
Impact/Purpose:
The objective of this work is to apply state-of-the-art atmospheric models, estimating the atmospheric contributions to multimedia issues and evaluating the models' strengths and weaknesses. A sub-objective of this work is to test the new sea salt version of CMAQ against field data and make necessary improvements so that it is an evaluated tool for coastal ocean and coastal estuary studies. A sub-objective of this work also is to develop an understanding of the relative contribution of the different emissions sources to the atmospheric nitrogen deposition to Tampa Bay and quantify an estimate of the benefit of the utility NOx reductions that have recently occurred. This will inform State and local managers as to the main estimated sources of nitrogen deposition to Tampa Bay. A sub-objective also is to also clarify the importance of sea salt to estimates of nitrogen deposition to coastal systems.
Description:
Air quality model results are developed and presented as to where ammonia goes once it is emitted. The ammonia budget is dissected in terms of dry and wet deposition and turbulent and wind transport. The domain of analysis is the eastern U.S. The CMAQ model is used with process analysis at a 12 km grid size. An important message is to show that only a minority of the ammonia emissions deposit locally around emission hot spots.