HR: 1330h
AN: A32A-0126    [PDF]
TI: A Biogenic Role in Exposure to Two Toxic Compounds.
AU: * Hutzell, W T
EM: hutzell.bill@epa.gov
AF: Atmospheric Modeling Division US EPA, E-243-03 USEPA MAILROOM, RTP, NC 27711 United States
AU: Gipson, G L
EM: gipson.gerry@epa.gov
AF: Atmospheric Modeling Division US EPA, E-243-03 USEPA MAILROOM, RTP, NC 27711 United States
AU: Pouliot, G
EM: pouliot.george@epa.gov
AF: Atmospheric Sciences Modeling Division, Air Resources Laboratory NOAA, E-243-04 USEPA MAILROOM, RTP, NC 27711 United States
AU: Pierce, T
EM: pierce.thomas@epa.gov
AF: Atmospheric Sciences Modeling Division, Air Resources Laboratory NOAA, E-243-04 USEPA MAILROOM, RTP, NC 27711 United States
AB: Biogenic sources play an important role in ozone and particulate concentrations through emissions of volatile organic compounds. The same emissions also contribute to chronic exposures to toxic compounds such as formaldehyde and acetaldehyde. Anthropogenic sources may dominate over biogenic sources in both primary and secondary production of both compounds. However, modeling tools are becoming able to answer how biogenic and anthropogenic sources contribute to both processes. Biogenic emissions models can predict formaldehyde and acetaldehyde emissions. Photochemical models can isolate how biogenic emissions contribute to the primary and secondary components of formaldehyde and acetaldehyde concentrations. Initial modeling shows that biogenic versus anthropogenic contributions depend on the pollutant and location. For example in the primary component, anthropogenic sources determine formaldehyde concentrations over most locations but acetaldehyde has a large contribution from biogenic sources over rural locations. For the secondary component, both pollutants have a significant contribution from biogenic sources outside urban areas. This presentation discusses these contributions and their evaluation based on a model system called CMAQ. This work has been funded wholly by the United States Environmental Protection Agency. It has been subjected to Agency review and approved for publication.
DE: 0315 Biosphere/atmosphere interactions
DE: 0322 Constituent sources and sinks
DE: 0345 Pollution--urban and regional (0305)
DE: 0365 Troposphere--composition and chemistry
DE: 0368 Troposphere--constituent transport and chemistry
SC: Atmospheric Sciences [A]
MN: 2003 Fall Meeting