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Cloud condensation nuclei activity, closure, and droplet growth kinetics of Houston aerosol during the Gulf of Mexico Atmospheric Composition and Climate Study (GoMACCS)

Lance, Sara and Nenes, Athanasios and Mazzoleni, Claudio and Dubey, Manvendra K. and Gates, Harmony and Varutbangkul, Varuntida and Rissman, Tracey A. and Murphy, Shane M. and Sorooshian, Armin and Flagan, Richard C. and Seinfeld, John H. and Feingold, Graham and Jonsson, Haflidi H. (2009) Cloud condensation nuclei activity, closure, and droplet growth kinetics of Houston aerosol during the Gulf of Mexico Atmospheric Composition and Climate Study (GoMACCS). Journal of Geophysical Research D, 114 (D7). D00F15. ISSN 0148-0227. https://resolver.caltech.edu/CaltechAUTHORS:20090817-144817060

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Abstract

In situ cloud condensation nuclei (CCN) measurements were obtained in the boundary layer over Houston, Texas, during the 2006 Gulf of Mexico Atmospheric Composition and Climate Study (GoMACCS) campaign onboard the CIRPAS Twin Otter. Polluted air masses in and out of cloudy regions were sampled for a total of 22 flights, with CCN measurements obtained for 17 of these flights. In this paper, we focus on CCN closure during two flights, within and downwind of the Houston regional plume and over the Houston Ship Channel. During both flights, air was sampled with particle concentrations exceeding 25,000 cm^(−3) and CCN concentrations exceeding 10,000 cm^(−3). CCN closure is evaluated by comparing measured concentrations with those predicted on the basis of measured aerosol size distributions and aerosol mass spectrometer particle composition. Different assumptions concerning the internally mixed chemical composition result in average CCN overprediction ranging from 3% to 36% (based on a linear fit). It is hypothesized that the externally mixed fraction of the aerosol contributes much of the CCN closure scatter, while the internally mixed fraction largely controls the overprediction bias. On the basis of the droplet sizes of activated CCN, organics do not seem to impact, on average, the CCN activation kinetics.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1029/2008JD011699DOIArticle
ORCID:
AuthorORCID
Nenes, Athanasios0000-0003-3873-9970
Murphy, Shane M.0000-0002-6415-2607
Sorooshian, Armin0000-0002-2243-2264
Flagan, Richard C.0000-0001-5690-770X
Seinfeld, John H.0000-0003-1344-4068
Jonsson, Haflidi H.0000-0003-3043-1074
Additional Information:©2009. American Geophysical Union. Received 31 December 2008; accepted 13 May 2009; published 30 July 2009. We acknowledge support from the National Oceanic and Atmospheric Administration (NOAA) under contracts NA05OAR4310101 and NA06OAR4310082, the support of an NSF CAREER grant, and the Office of Naval Research. S.L. would like to acknowledge the support of a Georgia Institute of Technology (Georgia Tech) Presidential Fellowship, a National Center for Atmospheric Research (NCAR) Advanced Study Program (ASP) Graduate Fellowship, and a National Research Council Research Associateships Program Fellowship (awarded January 2008). We also thank C. Brock and three anonymous reviewers for helpful comments, as well as A. Stohl and S. Ekhardt for providing the Flexpart back trajectory results. M.K.D. and C.M. thank LANL-LDRD and DOE-Office of Science-OBER-ASP for support of the photoacoustic deployment.
Funders:
Funding AgencyGrant Number
National Oceanic and Atmospheric Administration (NOAA)NA05OAR4310101
National Oceanic and Atmospheric Administration (NOAA)NA06OAR4310082
NSFUNSPECIFIED
Office of Naval Research (ONR)UNSPECIFIED
Georgia TechUNSPECIFIED
National Center for Atmospheric Research (NCAR)UNSPECIFIED
National Research Council of CanadaUNSPECIFIED
Los Alamos National LaboratoryUNSPECIFIED
Department of Energy (DOE)UNSPECIFIED
Subject Keywords:CCN, organics, measurements
Issue or Number:D7
Record Number:CaltechAUTHORS:20090817-144817060
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20090817-144817060
Official Citation:Lance, S., et al. (2009), Cloud condensation nuclei activity, closure, and droplet growth kinetics of Houston aerosol during the Gulf of Mexico Atmospheric Composition and Climate Study (GoMACCS), J. Geophys. Res., 114, D00F15, doi:10.1029/2008JD011699.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:15112
Collection:CaltechAUTHORS
Deposited By: George Porter
Deposited On:02 Sep 2009 21:29
Last Modified:03 Oct 2019 00:55

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