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Future Directions and the Importance of Scale in Estimating Atmospheric Nitrogen Loading to the Chesapeake Bay
Citation:
Bash, J., P. Campbell, D. Schwede, AND T. Spero. Future Directions and the Importance of Scale in Estimating Atmospheric Nitrogen Loading to the Chesapeake Bay. 2018 Chesapeake Community Research & Modeling Symposium, Annapolis, MD, June 12 - 14, 2018.
Impact/Purpose:
A new tiled, land use specific, dry deposition scheme developed for critical loads and total maximum daily load (TMDL) applications in the Community Multiscale Air Quality (CMAQ) model will be presented.
Description:
Atmospheric sources are one of the largest loadings of nitrogen to the Chesapeake Bay watershed. 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 developed for critical loads and total maximum daily load (TMDL) applications in the CMAQ model will be presented. In this study, we apply land use specific dry deposition and bulk grid cell deposition parameterizations to the Chesapeake Bay Watershed at 12 km and 4 km grid resolution to explore the impact that spatial scale and the parameterization of sub-grid cell processes have on estimates of nitrogen loading. Whether the parameterization of sub grid scale land use specific deposition estimates can partially compensate for higher spatial resolution will be evaluated. The impact on estimates evaluated against wet deposition and ambient concentrations observations and the mapping of deposition results to land use data will be discussed.
