Improved WRF-Chem Settings for Air Quality Meteorology Over Lake Michigan in Summer: Sensitivity to Boundary Condition, Initial Condition, Land Surface Parameterization, and PBL Scheme with Subsequent Influence on Biogenic Emissions and Ozone Formation
Abstract
The Lake Michigan Ozone Study (LMOS 2017) field campaign was conducted from May 22 to June 22, 2017, to address high ozone episodes in coastal communities surrounding Lake Michigan. Aircraft, ship, mobile lab, and ground-based sites were used to measure meteorological variables, ozone, ozone precursors, and particulate matter. The University of Iowa produced high-resolution (4x4 km horizontal resolution and 53 vertical levels) daily forecast products using the WRF-Chem modeling system in support of flight planning during LMOS 2017. The forecast model successfully captured diurnal and synoptic meteorology fields and ozone concentration. However, the forecast model was biased low in temperatures and biased high in dewpoints. Furthermore, the forecast model under-predicted peak ozone at coastal location during high ozone episodes and under-predicted isoprene, especially in June.
In the post-campaign analysis, we tested the sensitivity of the meteorological skills, biogenic emission, and ozone formation to the selection of initial and boundary conditions and land surface model parametrization. Selection of High-Resolution Rapid Refresh (HRRR) model as initial and boundary condition, and the Noah land surface model, significantly improved comparison of meteorology variables to both ground-based and aircraft data. For example, mean bias of surface temperature at Waukegan, Wisconsin site changed from -1.46°C in the base run to 0.03°C and mean bias of surface dew point temperature changed from 2.33°C to -0.04°C. Biogenic isoprene emission and ozone concentration did not show a strong sensitivity to the increase in temperature within the domain of this study.- Publication:
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AGU Fall Meeting Abstracts
- Pub Date:
- December 2018
- Bibcode:
- 2018AGUFM.A23M3062A
- Keywords:
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- 0305 Aerosols and particles;
- ATMOSPHERIC COMPOSITION AND STRUCTUREDE: 0315 Biosphere/atmosphere interactions;
- ATMOSPHERIC COMPOSITION AND STRUCTUREDE: 0345 Pollution: urban and regional;
- ATMOSPHERIC COMPOSITION AND STRUCTUREDE: 0365 Troposphere: composition and chemistry;
- ATMOSPHERIC COMPOSITION AND STRUCTURE