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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Title: A Large Organic Aerosol Source in the Free Troposphere Missing from Current Models
Author: Heald, Colette L.; Jacob, Daniel J.; Park, Rokjin J.; Russell, Lynn M.; Huebert, Barry J.; Seinfeld, John H.; Liao, Hong; Weber, Rodney J.

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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.
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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.
Published Version: doi:10.1029/2005GL023831
Terms of Use: This article is made available under the terms and conditions applicable to Other Posted Material, as set forth at http://nrs.harvard.edu/urn-3:HUL.InstRepos:dash.current.terms-of-use#LAA
Citable link to this page: http://nrs.harvard.edu/urn-3:HUL.InstRepos:3829250

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  • FAS Scholarly Articles [6948]
    Peer reviewed scholarly articles from the Faculty of Arts and Sciences of Harvard University
 
 

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