Aerosol optical properties in the southeastern United States in summer - Part 1: Hygroscopic growth

Brock, Charles A.; Wagner, Nicholas L.; Anderson, Bruce E.; Attwood, Alexis R.; Beyersdorf, Andreas; Campuzano-Jost, Pedro; Carlton, Annmarie G.; Day, Douglas A.; Diskin, Glenn S.; Gordon, Timothy D.; Jimenez, Jose L.; Lack, Daniel A.; Liao, Jin; Markovic, Milos Z.; Middlebrook, Ann M.; Ng, Nga L.; Perring, Anne E.; Richardson, Matthews S.; Schwarz, Joshua P.; Washenfelder, Rebecca A.; Welti, Andre; Xu, Lu; Ziemba, Luke D.; Murphy, Daniel M.

doi:10.5194/acp-16-4987-2016

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Aerosol optical properties in the southeastern United States in summer - Part 1: Hygroscopic growth

2016
By Brock, Charles A. ; Wagner, Nicholas L. ; Anderson, Bruce E. ; ...
Source: Atmospheric Chemistry and Physics, 16(8), 4987-5007.

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Journal Title:

Atmospheric Chemistry and Physics
Personal Author:

Brock, Charles A. ; Wagner, Nicholas L. ; Anderson, Bruce E. ; Attwood, Alexis R. ; Beyersdorf, Andreas ; ... More +

Brock, Charles A. ; Wagner, Nicholas L. ; Anderson, Bruce E. ; Attwood, Alexis R. ; Beyersdorf, Andreas ; Campuzano-Jost, Pedro ; Carlton, Annmarie G. ; Day, Douglas A. ; Diskin, Glenn S. ; Gordon, Timothy D. ; Jimenez, Jose L. ; Lack, Daniel A. ; Liao, Jin ; Markovic, Milos Z. ; Middlebrook, Ann M. ; Ng, Nga L. ; Perring, Anne E. ; Richardson, Matthews S. ; Schwarz, Joshua P. ; Washenfelder, Rebecca A. ; Welti, Andre ; Xu, Lu ; Ziemba, Luke D. ; Murphy, Daniel M. Less -
NOAA Program & Office:

OAR (Oceanic and Atmospheric Research) ; ESRL (Earth System Research Laboratory) ; CIRES (Cooperative Institute for Research in Environmental Sciences) ; CSL (Chemical Sciences Laboratory)

OAR (Oceanic and Atmospheric Research) ; ESRL (Earth System Research Laboratory) ; CIRES (Cooperative Institute for Research in Environmental Sciences) ; CSL (Chemical Sciences Laboratory) Less -
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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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Atmospheric Chemistry and Physics, 16(8), 4987-5007.
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https://doi.org/10.5194/acp-16-4987-2016
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Journal Article
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urn:sha256:6c849cc526beada8cc8c576e0a14164d76e2e7a7e667d2be5c33af52beb87395
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Aerosol optical properties in the southeastern United States in summer - Part 1: Hygroscopic growth

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