HR: 11:32h
AN: A22A-06    [Abstracts]
TI: Emission inventories for nitrogen oxides from U.S. road transport: What can ambient measurements tell us?
AU: * Parrish, D D
EM: David.D.Parrish@noaa.gov
AF: NOAA Aeronomy Laboratory, 325 Broadway R/AL7, Boulder, CO 80503 United States
AB: Road transport constitutes a relatively small fraction (about 40 percent) of U.S. nitrogen oxide emissions, yet it is an important source since 1) it is released predominately in populated urban areas, and 2) it is released simultaneously with reactive organic compounds, which provides an effective mix of precursors for photochemical ozone production. Comparisons of road transport emission inventories with ambient measurements in U.S. urban areas provide simple tests of some aspects of the inventories of these emissions. These tests indicate that the inventory for road transport and its temporal trend are surprisingly inaccurate. Most importantly, nitrogen oxide emissions are increasing over the last decade, rather than decreasing as suggested in the most recent inventories. Further, carbon monoxide emissions are over-estimated by about a factor of two, and total reactive organic emissions, while accurately estimated, are very poorly allocated to individual hydrocarbon species.
DE: 0322 Constituent sources and sinks
DE: 0345 Pollution--urban and regional (0305)
DE: 0365 Troposphere--composition and chemistry
SC: Atmospheric Sciences [A]
MN: 2004 AGU Fall Meeting