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Observed aerosol effects on marine cloud nucleation and supersaturation

Russell, Lynn M. and Seinfeld, J. H. and Chen, Yi-Chun and Coggon, Matthew and Craven, Jill S. and Flagan, Richard C. and Metcalf, Andrew R. (2013) Observed aerosol effects on marine cloud nucleation and supersaturation. In: Nucleation and Atmospheric Aerosols. AIP Conference Proceedings. No.1527. Melville, NY , American Institute of Physics, pp. 696-701. ISBN 978-0-7354-1152-4.

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Aerosol particles in the marine boundary layer include primary organic and salt particles from sea spray and combustion-derived particles from ships and coastal cities. These particle types serve as nuclei for marine cloud droplet activation, although the particles that activate depend on the particle size and composition as well as the supersaturation that results from cloud updraft velocities. The Eastern Pacific Emitted Aerosol Cloud Experiment (EPEACE) 2011 was a targeted aircraft campaign to assess how different particle types nucleate cloud droplets. As part of E-PEACE 2011, we studied the role of marine particles as cloud droplet nuclei and used emitted particle sources to separate particle-induced feedbacks from dynamical variability. The emitted particle sources included shipboard smoke-generated particles with 0.05-1 μm diameters (which produced tracks measured by satellite and had drop composition characteristic of organic smoke) and combustion particles from container ships with 0.05-0.2 μm diameters (which were measured in a variety of conditions with droplets containing both organic and sulfate components) [1]. Three central aspects of the collaborative E-PEACE results are: (1) the size and chemical composition of the emitted smoke particles compared to ship-track-forming cargo ship emissions as well as background marine particles, with particular attention to the role of organic particles, (2) the characteristics of cloud track formation for smoke and cargo ships, as well as the role of multi-layered low clouds, and (3) the implications of these findings for quantifying aerosol indirect effects. For comparison with the E-PEACE results, the preliminary results of the Stratocumulus Observations of Los-Angeles Emissions Derived Aerosol-Droplets (SOLEDAD) 2012 provided evidence of the cloud-nucleating roles of both marine organic particles and coastal urban pollution, with simultaneous measurements of the effective supersaturations of the clouds in the California coastal region.

Item Type:Book Section
Related URLs:
URLURL TypeDescription DOIArticle
Russell, Lynn M.0000-0002-6108-2375
Seinfeld, J. H.0000-0003-1344-4068
Chen, Yi-Chun0000-0001-7997-8578
Coggon, Matthew0000-0002-5763-1925
Flagan, Richard C.0000-0001-5690-770X
Metcalf, Andrew R.0000-0003-0385-1356
Additional Information:© 2013 AIP Publishing LLC. The E-PEACE 2011 field campaign and modeling studies were funded by the National Science Foundation (AGS-1013423; AGS-1008848; AGS-1013381; AGS-1013319; ATM-0744636; AGS-0821599; ATM-0349015) and the Office of Naval Research (N00014-11-1-0783; N00014-10-1-0811; N00014-10-1-0200; N00014-08-1-0465). Sea Spray Research, Inc., provided oil for the operation of the smoke generators. The authors gratefully acknowledge the crews of the CIRPAS Twin Otter and the R/V Point Sur for their assistance during the field campaign, Tom Maggard who revived and tirelessly maintained the smoke generators during the cruise, and Spyros Pandis for providing the CCN spectrometer. The SOLEDAD 2012 field measurements shown here were a collaboration of Scripps Institution of Oceanography and Environment Canada.
Funding AgencyGrant Number
Office of Naval Research (ONR)N00014-11-1-0783
Office of Naval Research (ONR)N00014-10-1-0811
Office of Naval Research (ONR)N00014-10-1-0200
Office of Naval Research (ONR)N00014-08-1-0465
Subject Keywords:Atmospheric Aerosol; Marine Aerosol; Cloud Properties; Aerosol-Cloud Interactions; Marine Boundary Layer
Series Name:AIP Conference Proceedings
Issue or Number:1527
Record Number:CaltechAUTHORS:20140310-102849450
Persistent URL:
Official Citation:Observed aerosol effects on marine cloud nucleation and supersaturation Russell, Lynn M. and Sorooshian, Armin and Seinfeld, John H. and Albrecht, Bruce A. and Nenes, Athanasios and Leaitch, W. Richard and Macdonald, Anne Marie and Ahlm, Lars and Chen, Yi-Chun and Coggon, Matthew and Corrigan, Ashley and Craven, Jill S. and Flagan, Richard C. and Frossard, Amanda A. and Hawkins, Lelia N. and Jonsson, Haflidi and Jung, Eunsil and Lin, Jack J. and Metcalf, Andrew R. and Modini, Robin and Mülmenstädt, Johannes and Roberts, Greg C. and Shingler, Taylor and Song, Siwon and Wang, Zhen and Wonaschütz, Anna, AIP Conference Proceedings, 1527, 696-701 (2013), DOI:
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:44219
Deposited By: Tony Diaz
Deposited On:10 Mar 2014 17:45
Last Modified:10 Nov 2021 16:49

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