2007 Progress Report: Impact of Global Change on Urban Air Quality via Changes in Mobile Source Emissions, Background Concentrations, and Regional Scale Meteorological FeedbacksEPA Grant Number: R833372
Title: Impact of Global Change on Urban Air Quality via Changes in Mobile Source Emissions, Background Concentrations, and Regional Scale Meteorological Feedbacks
Investigators: Kleeman, Michael J. , Chen, Shuhua , Schauer, James J.
Institution: University of California - Davis , University of Wisconsin Madison
EPA Project Officer: Hunt, Sherri
Project Period: March 1, 2007 through February 28, 2011 (Extended to February 28, 2013)
Project Period Covered by this Report: March 1, 2007 through February 29,2008
Project Amount: $900,000
RFA: Consequences of Global Change For Air Quality (2006) RFA Text | Recipients Lists
Research Category: Climate Change , Air , Global Climate Change
The current project aims to quantitatively assess the consequences of Global Change on California air quality by (1) measuring emissions from mobile sources powered by alternative fuels as a function of temperature and humidity, (2) creating a source-oriented PM module for the Weather Research & Forecasting (WRF) model to quantify feedback between air quality and regional meteorology, and (3) calculating California air quality in the year 2030 during a range of O3 and PM2.5 pollution events.
The latest version of the WRF and WPS models was installed on the Kleeman UC Davis computing cluster. The efficiency and accuracy of the advection subroutines used in WRF was compared to the analogous routines used in traditional air pollution models. Although the WRF routines require twice the memory footprint of the traditional air pollution models, the speed and accuracy of the routines is comparable to the traditional algorithms. This finding means that no changes will be required for the WRF advection routines as the number of model species is increased to track source-oriented information.
The format of the NETCDF emissions files used by WRF was examined and NETCDF libraries were incorporated into the UCD emissions processing software. All of the historical size-resolved source profiles can now be used to generate WRF emissions.
The source sampling system was configured and tested in the first year of the project. Blanks tests and a performance text were conducted using a potential future emissions control technology, fuel borne catalyst. Preparation for Year 2 tests were completed for three series of emissions testing: 1) Impact of biodiesel source on off-road diesel engines, 2) impact of biodiesel blends on a 2007 certifitied diesel engine, and 3) impact of future fuels and technologies on gasoline powere-motor vehicle emissions.
During the coming reporting period we will expand the capabilities of the WRF model so that it can track source-oriented pollution variables (requiring dimensions of 5 and 6). Source-oriented emissions will be generated for the state of California in the NETCDF format that WRF can read. Basecase emissions profiles will be measured for biodiesel, ethanol, natural gas, and gasoline-electric hybrid vehicles.