A Large Organic Aerosol Source in the Free Troposphere Missing from Current Models

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A Large Organic Aerosol Source in the Free Troposphere Missing from Current Models

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dc.contributor.author Heald, Colette L.
dc.contributor.author Jacob, Daniel J.
dc.contributor.author Park, Rokjin J.
dc.contributor.author Russell, Lynn M.
dc.contributor.author Huebert, Barry J.
dc.contributor.author Seinfeld, John H.
dc.contributor.author Liao, Hong
dc.contributor.author Weber, Rodney J.
dc.date.accessioned 2010-04-07T16:36:55Z
dc.date.issued 2005
dc.identifier.citation Heald, Colette L., Daniel J. Jacob, Rokjin J. Park, Lynn M. Russell, Barry J. Huebert, John H. Seinfeld, Hong Liao, and Rodney J. Weber. 2005. A large organic aerosol source in the free troposphere missing from current models. Geophysical Research Letters 32: L18809. en_US
dc.identifier.issn 0094-8276 en_US
dc.identifier.uri http://nrs.harvard.edu/urn-3:HUL.InstRepos:3829250
dc.description.abstract Aircraft measurements of organic carbon (OC) aerosol by two independent methods over the NW Pacific during the ACE-Asia campaign reveal unexpectedly high concentrations in the free troposphere (FT). Concentrations average 4 μg sm−3 in the 2–6.5 km column with little vertical gradient. These values are 10–100 times higher than computed with a global chemical transport model (CTM) including a standard 2-product simulation of secondary organic aerosol (SOA) formation based on empirical fits to smog chamber data. The same CTM reproduces the observed vertical profiles of sulfate and elemental carbon aerosols, which indicate sharp decreases from the boundary layer to the FT due to wet scavenging. Our results suggest a large, sustained source of SOA in the FT from oxidation of long-lived volatile organic compounds. We find that this SOA is the dominant component of aerosol mass in the FT, with implications for intercontinental pollution transport and radiative forcing of climate. en_US
dc.description.sponsorship Earth and Planetary Sciences en_US
dc.description.sponsorship Engineering and Applied Sciences en_US
dc.language.iso en_US en_US
dc.publisher American Geophysical Union en_US
dc.relation.isversionof doi:10.1029/2005GL023831 en_US
dash.license LAA
dc.title A Large Organic Aerosol Source in the Free Troposphere Missing from Current Models en_US
dc.type Journal Article en_US
dc.description.version Version of Record en_US
dc.relation.journal Geophysical Research Letters en_US
dash.depositing.author Jacob, Daniel J.
dc.date.available 2010-04-07T16:36:55Z

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  • FAS Scholarly Articles [7262]
    Peer reviewed scholarly articles from the Faculty of Arts and Sciences of Harvard University

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