PNNL Next Generation Chemistry-Meteorology-Aerosol Model
EMSL Project ID
9301
Abstract
As part of a CS&IE LDRD project, we are developing capabilities to perform computationally demanding simulations addressing the emerging issues of the impacts of climate change and mega-cities on regional air quality. The computational efficiency of PNNL?s current air-quality model, PEGASUS, will be improved. The PEGASUS chemistry and aerosol modules will be put into the framework of the Weather Research and Forecast (WRF) meteorological model that is being developed collaboratively among many research institutes. We will add aerosol-chemistry-cloud-radiation feedback mechanisms, extend the treatment of volatile organic compounds, improve the efficiency of the parallel code, and complete a proof-of-concept simulation. PEGASUS-WRF represents a next-generation model, which will enable PNNL staff to maintain our forefront position in regional-scale air-quality modeling and respond to new programs concerned with climate-chemistry interactions. The computational efficiency of PNNL?s current air-quality model, PEGASUS, will be significantly improved so that it can be applied to regional-scale climate air-quality applications in the near term. PEGASUS will be ported to EMSL?s massively parallel computers, such as MPP-2. We will modify the input and output sections to reduce the current bottleneck, incorporate global arrays so that data is evenly distributed across the processors, and improve load balancing associated with variations in trace gas and aerosol concentrations over the model domain. This work will be completed in FY 2004.
The PNNL next-generation chemistry-aerosol-meteorology model, PEGASUS-WRF, will be developed by incorporating the trace gas and aerosol modules of PEGASUS into the Weather Research and Forecast (WRF) model and adding feedback mechanisms associated with aerosols, chemistry, clouds, and radiation. A working version of PEGASUS-WRF will be produced by the end of FY 2004. Scalability and load balancing issues with PEGASUS-WRF will be addressed to improve its computational efficiency. To better represent the processes associated with urban emissions and their impact at large spatial and time scales for regional-scale climate applications, the treatment of volatile organic compounds will be extended to include additional large hydrocarbons and secondary organic aerosols. Several proof-of-concept simulations will be completed that will demonstrate both from a scientific and computational perspective, the performance and advantages of PEGASUS-WRF. These tasks will be completed in FY 2005.
WRF is expected to become the next atmospheric sciences community model in which the best scientific advances in meteorology and atmospheric chemistry are tested. WRF developers have already indicated that they are interested in PNNL?s code and would distribute it as an optional user module. Merging PEGASUS modules into the WRF framework will enable PNNL?s research to be widely distributed among the scientific community (both DOE and non-DOE), promoting collaboration with other research groups and foster new funding opportunities.
Project Details
Start Date
2004-07-13
End Date
2006-10-17
Status
Closed
Released Data Link
Team
Principal Investigator
Team Members
Related Publications
Berg, L. K., W. I. Gustafson Jr., E. I. Kassianov, L. Deng, 2013: Evaluation of a modified scheme for shallow convection: Implementation of CuP and case studies. Mon. Wea. Rev. 1, 134-147.