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Runtime NH3 emission estimates using the Surface Tiled Aerosol and Gaseous Exchange (STAGE) dry deposition option in the Community Multiscale Air Quality (CMAQ) Model v5.3
Citation:
Bash, J., V. Rao, I. Rumsey, Johnt Walker, P. Campbell, T. Spero, W. Appel, M. Shephard, AND K. Cady-Pereira. Runtime NH3 emission estimates using the Surface Tiled Aerosol and Gaseous Exchange (STAGE) dry deposition option in the Community Multiscale Air Quality (CMAQ) Model v5.3. 2018 AGU Fall Meeting, Washington, DC, December 10 - 14, 2018.
Impact/Purpose:
A new option in the Community Multiscale Air Quality (CMAQ) model v5.3 has been developed that can estimate emissions or deposition of atmospheric pollutants to different types of land use depending on environmental conditions. Ammonia emission estimates from crops have been generated using this option. These estimates are evaluated with field scale observations, national fertilizer application estimates and previous estimates commonly used in air quality models. These results will be discussed as well as the application of this model to other pollutants.
Description:
There has been active development of the Community Multiscale Air Quality (CMAQ) model to better estimate atmospheric deposition for terrestrial and aquatic ecosystem health applications. A new tiled, land use specific, dry deposition scheme has been developed to improve simulations of critical loads, total maximum daily load (TMDL) and research applications to evaluate the impact of dry deposition and bidirectional exchange of pollutants on ambient air quality in CMAQ v5.3. A model resistance framework that parameterizes air-surface exchange as a gradient process and is consistent between bidirectional exchange and dry deposition will be introduced. A brief evaluation of box model NH3 fluxes against micrometeorological observations will be presented. Continental-scale simulations using a beta version of CMAQ v5.3 will be evaluated against network wet deposition and ambient concentrations of reduced nitrogen species to quantify the model performance of this option. CMAQ v5.3 model estimates of NH3 emissions from fertilizer will be evaluated against 2014 and 2011 U.S. EPA NEI estimates and model fertilizer application inputs and timing to evaluate the modeled emission factors and seasonality. Estimates of biogenic NH3 emissions will also be presented and discussed. The potential for using the STAGE option for estimating bidirectional exchange of other atmospheric pollutants will also be discussed.
