Secondary organic aerosol formation from anthropogenic air pollution: Rapid and higher than expected

Details Secondary organic aerosol formation from anthropogenic air pollution: Rapid and higher than expected Secondary organic aerosol formation from anthropogenic air pollution: Rapid and higher than expected

Sep 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006georl..3317811v&link_type=abstract

Geophysical Research Letters, Volume 33, Issue 17, CiteID L17811

Other

247

Atmospheric Composition And Structure: Aerosols And Particles (0345, 4801, 4906), Atmospheric Composition And Structure: Constituent Sources And Sinks, Atmospheric Composition And Structure: Pollution: Urban And Regional (0305, 0478, 4251), Atmospheric Composition And Structure: Radiation: Transmission And Scattering, Atmospheric Composition And Structure: Troposphere: Composition And Chemistry

Scientific paper

The atmospheric chemistry of volatile organic compounds (VOCs) in urban areas results in the formation of `photochemical smog', including secondary organic aerosol (SOA). State-of-the-art SOA models parameterize the results of simulation chamber experiments that bracket the conditions found in the polluted urban atmosphere. Here we show that in the real urban atmosphere reactive anthropogenic VOCs (AVOCs) produce much larger amounts of SOA than these models predict, even shortly after sunrise. Contrary to current belief, a significant fraction of the excess SOA is formed from first-generation AVOC oxidation products. Global models deem AVOCs a very minor contributor to SOA compared to biogenic VOCs (BVOCs). If our results are extrapolated to other urban areas, AVOCs could be responsible for additional 3-25 Tg yr-1 SOA production globally, and cause up to -0.1 W m-2 additional top-of-the-atmosphere radiative cooling.

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