AAAR 31st Annual Conference
October 8-12, 2012
Hyatt Regency Minneapolis
Minneapolis, Minnesota, USA
Abstract View
Impact of Updated Emission Inventories on Source Apportionment of Fine Particle and Ozone Over the Southeastern U.S
WEI WANG, Shiang-Yuh Wu, Kai Wang, Yang Zhang, Hiroaki Minoura, Zifa Wang, North Carolina State University, Raleigh, NC, USA
Abstract Number: 415 Working Group: Source Apportionment
Abstract Various source apportionment techniques have been developed to estimate source contributions (SC) to major pollutants for emission control, which are largely affected by updates in the National Emission Inventory (NEI). SCs of 10 major source categories to fine particulate matter (PM$_(2.5)) were previously estimated over the southeast U.S. for 2002 based on the 1999 NEI version 2 (NEI99v2) using the Community Multiscale Air Quality modeling system with the Brute Force Method, which calculates SCs based on predictions using baseline emissions and a set of emissions with one category zeroed-out one at a time. New simulations with the 2005 NEI (NEI05) are conducted and compared with previous simulations to examine changes in SCs. PM$_(2.5) concentrations increase by 9.1% in January and 19.2% in July. In January, miscellaneous areas (MISC), biomass burning (BIOM) and coal combustion (COAL) remain the top 3 contributors to PM$_(2.5) but with different ranking and higher SCs, due to increased primary PM$_(2.5) (PPM) emissions in NEI05 and increases in relative contributions of MISC and COAL to emissions of PPM, NH$_3 and SO$_2. In July, COAL, MISC and industrial processes (INDUST) remain the top three with higher SCs for similar reasons. SCs from diesel and gasoline vehicles (DV and GV) decrease in both months, due to decreased GV contributions to SO$_2 and NH$_3 emissions and DV contributions to NO$_x and PPM emissions. Compared with NEI99v2, SCs from other combustion and BIOM are higher in Florida, due to substantial increases in formaldehyde and PPM emissions in NEI05, resulting from higher wildfire emissions and state emission updates. SCs from INDUST increase and those from DV and GV decrease in urban areas. SCs of O$_3 from most sources in July increase due to a large increase in their contributions to NO$_x emissions. These results have important policy implications to emission control strategies.