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Aerosol–cloud drop concentration closure for clouds sampled during the International Consortium for Atmospheric Research on Transport and Transformation 2004 campaign

Fountoukis, Christos and Nenes, Athanasios and Meskhidze, Nicholas and Bahreini, Roya and Conant, William C. and Jonsson, Haflidi and Murphy, Shane and Sorooshian, Armin and Varutbangkul, Varuntida and Brechtel, Fred and Flagan, Richard C. and Seinfeld, John H. (2007) Aerosol–cloud drop concentration closure for clouds sampled during the International Consortium for Atmospheric Research on Transport and Transformation 2004 campaign. Journal of Geophysical Research. Atmospheres, 112 (D10). Art. No. D10S30. ISSN 2169-897X. https://resolver.caltech.edu/CaltechAUTHORS:20141028-140023116

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Abstract

This study analyzes 27 cumuliform and stratiform clouds sampled aboard the CIRPAS Twin Otter during the 2004 International Consortium for Atmospheric Research on Transport and Transformation (ICARTT) experiment. The data set was used to assess cloud droplet closure using (1) a detailed adiabatic cloud parcel model and (2) a state-of-the-art cloud droplet activation parameterization. A unique feature of the data set is the sampling of highly polluted clouds within the vicinity of power plant plumes. Remarkable closure was achieved (much less than the 20% measurement uncertainty) for both parcel model and parameterization. The highly variable aerosol did not complicate the cloud droplet closure, since the clouds had low maximum supersaturation and were not sensitive to aerosol variations (which took place at small particle sizes). The error in predicted cloud droplet concentration was mostly sensitive to updraft velocity. Optimal closure is obtained if the water vapor uptake coefficient is equal to 0.06, but can range between 0.03 and 1.0. The sensitivity of cloud droplet prediction error to changes in the uptake coefficient, organic solubility and surface tension depression suggest that organics exhibit limited solubility. These findings can serve as much needed constraints in modeling of aerosol-cloud interactions in the North America; future in situ studies will determine the robustness of our findings.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1029/2006JD007272DOIArticle
http://onlinelibrary.wiley.com/doi/10.1029/2006JD007272/abstractPublisherArticle
http://onlinelibrary.wiley.com/doi/10.1029/2006JD007272/suppinfoPublisherSupporting Information
ORCID:
AuthorORCID
Nenes, Athanasios0000-0003-3873-9970
Jonsson, Haflidi0000-0003-3043-1074
Murphy, Shane0000-0002-6415-2607
Sorooshian, Armin0000-0002-2243-2264
Flagan, Richard C.0000-0001-5690-770X
Seinfeld, John H.0000-0003-1344-4068
Additional Information:Copyright 2007 by the American Geophysical Union. Received 8 March 2006; revised 19 November 2006; accepted 21 February 2007; published 26 April 2007. We acknowledge the support of the National Science Foundation under award ATM-0340832. C.F., A.N. and N.M. acknowledge support from an NSF CAREER award, a NASA EOS-IDS and a NASA NIP. C.F. acknowledges support from a Gerondelis Foundation Fellowship.
Funders:
Funding AgencyGrant Number
NSFATM-0340832
NASAUNSPECIFIED
Gerondelis FoundationUNSPECIFIED
Subject Keywords:aerosol; cloud droplet; clouds
Issue or Number:D10
Record Number:CaltechAUTHORS:20141028-140023116
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20141028-140023116
Official Citation:Fountoukis, C., et al. (2007), Aerosol–cloud drop concentration closure for clouds sampled during the International Consortium for Atmospheric Research on Transport and Transformation 2004 campaign, J. Geophys. Res., 112, D10S30, doi:10.1029/2006JD007272.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:50952
Collection:CaltechAUTHORS
Deposited By: George Porter
Deposited On:28 Oct 2014 23:39
Last Modified:03 Oct 2019 07:28

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