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Aerosol optical properties in the southeastern United States in summer - Part 1: Hygroscopic growth
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2016
Source: Atmospheric Chemistry and Physics, 16(8), 4987-5007.
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Journal Title:Atmospheric Chemistry and Physics
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Personal Author:Brock, C. A. ; Wagner, N. L. ; Anderson, B. E. ; Attwood, A. R. ; Beyersdorf, A. ; Campuzano-Jost, P. ; Carlton, A. G. ; Day, D. A. ; Diskin, G. S. ; Gordon, T. D. ; Jimenez, J. L. ; Lack, D. A. ; Liao, J. ; Markovic, M. Z. ; Middlebrook, A. M. ; Ng, N. L. ; Perring, A. E. ; Richardson, M. S. ; Schwarz, J. P. ; Washenfelder, R. A. ; Welti, A. ; Xu, L. ; Ziemba, L. D. ; Murphy, D. M. ; Less -
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NOAA Program & Office:
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Description:Aircraft observations of meteorological, trace gas, and aerosol properties were made during May-September 2013 in the southeastern United States (US) under fair-weather, afternoon conditions with well-defined planetary boundary layer structure. Optical extinction at 532aEuro-nm was directly measured at relative humidities (RHs) of aEuro-15, aEuro-70, and aEuro-90aEuro-% and compared with extinction calculated from measurements of aerosol composition and size distribution using the kappa-Kohler approximation for hygroscopic growth. The calculated enhancement in hydrated aerosol extinction with relative humidity, f(RH), calculated by this method agreed well with the observed f(RH) at aEuro-90aEuro-% RH. The dominance of organic aerosol, which comprised 65aEuro-+/- aEuro-10aEuro-% of particulate matter with aerodynamic diameter < aEuro-1aEuro-A mu m in the planetary boundary layer, resulted in relatively low f(RH) values of 1.43aEuro-+/- aEuro-0.67 at 70aEuro-% RH and 2.28aEuro-+/- aEuro-1.05 at 90aEuro-% RH. The subsaturated kappa-Kohler hygroscopicity parameter kappa for the organic fraction of the aerosol must have been < aEuro-0.10 to be consistent with 75aEuro-% of the observations within uncertainties, with a best estimate of kappa aEuro- = aEuro-0.05. This subsaturated kappa value for the organic aerosol in the southeastern US is broadly consistent with field studies in rural environments. A new, physically based, single-parameter representation was developed that better described f(RH) than did the widely used gamma power-law approximation.
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Source:Atmospheric Chemistry and Physics, 16(8), 4987-5007.
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Rights Information:CC BY
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Compliance:Submitted
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