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Introducing the Surface Tiled Aerosol and Gaseous Exchange (STAGE) Dry Deposition Option for CMAQ V5.3
Citation:
Bash, J., Johnt Walker, D. Schwede, P. Campbell, T. Spero, W. Appel, M. Shephard, K. Cady-Pereira, R. Pinder, H. Pye, B. Murphy, AND K. Fahey. Introducing the Surface Tiled Aerosol and Gaseous Exchange (STAGE) Dry Deposition Option for CMAQ V5.3. 2018 CMAS Annual Conference, Chapel Hill, NC, October 22 - 24, 2018.
Impact/Purpose:
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 on ambient air quality in CMAQ v5.3. This new scheme explicitly supports Weather Research and Forecasting (WRF) simulations with the Noah and Pleim-Xiu land surface schemes
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 on ambient air quality in CMAQ v5.3. This new scheme explicitly supports Weather Research and Forecasting (WRF) simulations with the Noah and Pleim-Xiu land surface schemes. 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 HNO3, NH3, SO2, and O3 fluxes against micrometeorological observations will be presented. Continental-scale simulations using a beta version of CMAQ v5.3 are evaluated against network wet deposition and ambient concentrations to indicate where this option improves or degrades model performance. Preliminary simulations using the STAGE option provide more consistent coupling with water quality and ecosystem models as well as areas of improved model performance when evaluated against wet deposition and ambient concentrations, particularly coastal ozone. Insights gleaned into the processes involved in model improvements will be presented. Additionally, the impact of including subgrid air-surface exchange processes on grid resolution and the mapping of deposition results to high-resolution land use data will be discussed.
