HR: 0800h
AN: A51A-04    [Abstracts]
TI: Effects of Changes in Anthropogenic and Biogenic Emissions on the Ozone Air Quality over the United States
AU: Lin, J
EM: jlin5@atmos.uiuc.edu
AF: Department of Atmospheric Sciences, University of Illinois at Urbana-Champaign, 105 S. Gregory St., Urbana, IL 61801, United States
AU: * Wuebbles, D
EM: wuebbles@atmos.uiuc.edu
AF: Department of Atmospheric Sciences, University of Illinois at Urbana-Champaign, 105 S. Gregory St., Urbana, IL 61801, United States
AU: Hayhoe, K
EM: katharine.hayhoe@ttu.edu
AF: 2Department of Geosciences, Texas Tech University, Department of Geosciences, Texas Tech University, Lubbock, TX 79409-1053, United States
AB: Changes in surface ozone air quality are very likely in the coming decades in response to changes in climate and precursor emissions from both anthropogenic and biogenic sources. The effects of changes in anthropogenic and biogenic emissions on ozone are distinct. Changes in anthropogenic emissions include most ozone precursors including NOx, CO and VOC emissions while changes in biogenic emissions contribute primarily to VOC emissions. The resulting relative abundances of NOx versus VOC differ from each other, leading to different magnitudes/patterns of ozone responses. This study uses a global chemical transport model to investigate the effects of climate and emission changes on summertime surface ozone levels over the United States during the 21st century under the IPCC A1fi and B1 scenarios, with emphasis on the combined and separate contributions of changes in anthropogenic and biogenic emissions. The global modeling accounts for the ozone response within the context of global climate and emission changes. Preliminary results show that, by the late 21st century, ozone would increase (decrease) more than 20 ppb over the U.S. due to enhancements (reductions) of anthropogenic emissions under A1fi (B1). In addition, there would be as much as a 20 ppb increase of ozone under the A1fi scenario due to increases in biogenic emissions. This study suggests that increases in biogenic emissions would significantly affect the ozone air quality under highly-warming climate scenarios, making it that much more difficult to meet acceptable ozone levels in the future.
DE: 0300 ATMOSPHERIC COMPOSITION AND STRUCTURE
DE: 0322 Constituent sources and sinks
DE: 0345 Pollution: urban and regional (0305, 0478, 4251)
DE: 0365 Troposphere: composition and chemistry
DE: 0368 Troposphere: constituent transport and chemistry
SC: Atmospheric Sciences [A]
MN: 2007 Joint Assembly