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Aerosol-cloud relationships in continental shallow cumulus

Lu, Miao-Ling and Feingold, Graham and Jonsson, Haflidi H. and Chuang, Patrick Y. and Gates, Harmony and Flagan, Richard C. and Seinfeld, John H. (2008) Aerosol-cloud relationships in continental shallow cumulus. Journal of Geophysical Research D, 113 (D15). Art. No. D15201. ISSN 0148-0227. doi:10.1029/2007JD009354.

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Aerosol-cloud relationships are derived from 14 warm continental cumuli cases sampled during the 2006 Gulf of Mexico Atmospheric Composition and Climate Study (GoMACCS) by the Center for Interdisciplinary Remotely-Piloted Aircraft Studies (CIRPAS) Twin Otter aircraft. Cloud droplet number concentration is clearly proportional to the subcloud accumulation mode aerosol number concentration. An inverse correlation between cloud top effective radius and subcloud aerosol number concentration is observed when cloud depth variations are accounted for. There are no discernable aerosol effects on cloud droplet spectral dispersion; the averaged spectral relative dispersion is 0.30 ± 0.04. Aerosol-cloud relationships are also identified from comparison of two isolated cloud cases that occurred under different degrees of anthropogenic influence. Cloud liquid water content, cloud droplet number concentration, and cloud top effective radius exhibit subadiabaticity resulting from entrainment mixing processes. The degree of LWC subadiabaticity is found to increase with cloud depth. Impacts of subadiabaticity on cloud optical properties are assessed. It is estimated that owing to entrainment mixing, cloud LWP, effective radius, and cloud albedo are decreased by 50–85%, 5–35%, and 2–26%, respectively, relative to adiabatic values of a plane-parallel cloud. The impact of subadiabaticity on cloud albedo is largest for shallow clouds. Results suggest that the effect of entrainment mixing must be accounted for when evaluating the aerosol indirect effect.

Item Type:Article
Related URLs:
URLURL TypeDescription
Jonsson, Haflidi H.0000-0003-3043-1074
Chuang, Patrick Y.0000-0003-2290-8346
Flagan, Richard C.0000-0001-5690-770X
Seinfeld, John H.0000-0003-1344-4068
Additional Information:© 2008 American Geophysical Union. Received 4 September 2007; revised 29 February 2008; accepted 12 May 2008; published 5 August 2008. This work was supported by National Oceanic and Atmospheric Administration grant NA06OAR4310082.
Funding AgencyGrant Number
National Oceanic and Atmospheric Administration (NOAA)NA06OAR4310082
Issue or Number:D15
Record Number:CaltechAUTHORS:20150818-111456879
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Official Citation:Lu, M.-L., G. Feingold, H. H. Jonsson, P. Y. Chuang, H. Gates, R. C. Flagan, and J. H. Seinfeld (2008), Aerosol-cloud relationships in continental shallow cumulus, J. Geophys. Res., 113, D15201, doi:10.1029/2007JD009354.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:59732
Deposited By: Irina Meininger
Deposited On:19 Aug 2015 17:21
Last Modified:10 Nov 2021 22:24

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