HiResX Air Quality & Source Impacts Forecasting for Georgia

Forecasting Source Impacts for Georgia

Updated from the HiRes system, the HiRes2 air quality forecasting system had been in operation at Georgia Tech since November 2014 until August 2024. The system used WRF3.6 and CMAQ5.0.2 with SAPRC07TC mechanism, AERO6 aerosol module, inline BEIS biogenic emissions and inline 3-D point source emissions processing and had based its emissions projection on 2011 NEI. In addition to providing air quality concentration e.g. O3 and PM2.5 forecasts, it also forecasts air quality impacts from sources such as power plants and traffic (on-road motor vehicles) by utilizing the DDM-3D technique that has been integrated into CMAQ5.0.2. The source impacts usually show significant differences in their spatial patterns. For example, traffic emissions tend to dominate contribution to PM2.5 at local scales while power plants extend their impacts to long distances. The system also forecasts prescribed burn (PB) impacts, which can be significant in winter and spring.

To improve the accuracy of forecasting, in HiRes2 system, the emissions were continuously "corrected" by near real-time observations. The DDM-3D sensitivities are used in an inverse modeling context to improve forecasting performance. By utilizing the observations during the last 7 days, the emissions are adjusted to reduce the biase in the foercast and are used for the next 7 days. Currently, the observations used in this process are ground level measurements of PM2.5 averaged to daily values. The satellite retrievals from NASA MODIS collection 6 AOD products and ground level measurements of other pollutants will also be used in inverse modeling.

The HiRes2 system has been discontinued in 2024 due to hardware failure of the host server. Fortunately, we have built the HiResX system in 2022 which keeps most of the HiRes2 features except the continous emissions "correction" and extends the prescribed burn impacts forecasts to 48 hrs. We recycled this HiRes2 website to continously disemminate part of the HiResX forecasting products. To acceess the full range of products from HiResX please visit our SIPFIS website at https://sipfis.ce.gatech.edu/

Funding

This project was funded by Georgia EPD, USEPA and by NASA through the Air Quality Applied Science Team program.