Next Article in Journal
On the Importance of Aerosol Composition for Estimating Incoming Solar Radiation: Focus on the Western African Stations of Dakar and Niamey during the Dry Season
Next Article in Special Issue
The Influence of Sandstorms and Long-Range Transport on Polycyclic Aromatic Hydrocarbons (PAHs) in PM2.5 in the High-Altitude Atmosphere of Southern China
Previous Article in Journal
Radiation Balance of Urban Materials and Their Thermal Impact in Semi-Desert Region: Mexicali, México Study Case
Previous Article in Special Issue
Inland Concentrations of Cl2 and ClNO2 in Southeast Texas Suggest Chlorine Chemistry Significantly Contributes to Atmospheric Reactivity
Article Menu

Export Article

Open AccessArticle
Atmosphere 2015, 6(11), 1590-1607;

CCN Properties of Organic Aerosol Collected Below and within Marine Stratocumulus Clouds near Monterey, California

Department of Chemical and Environmental Engineering, University of California, Riverside, Riverside, CA 92521, USA
Bourns College of Engineering, Center for Environmental Research and Technology, University of California, Riverside, Riverside, CA 92507, USA
Departments of Chemical and Environmental Engineering, and Atmospheric Sciences University of Arizona, Tucson, AZ 85721, USA
Department of Chemical Engineering, California Institute of Technology, Pasadena, CA 91125, USA
Schools of Chemical and Biomolecular Engineering and Earth and Atmospheric Sciences, Georgia Institute of Technology, Atlanta, GA 30332, USA
Institute of Chemical Engineering Sciences, FORTH, Patras, GR-26504, Greece
Institute of Environmental Research and Sustainable Development, National Observatory of Athens, Palea Penteli, GR-15236, Greece
Author to whom correspondence should be addressed.
Academic Editor: Robert W. Talbot
Received: 31 August 2015 / Revised: 5 October 2015 / Accepted: 10 October 2015 / Published: 28 October 2015
(This article belongs to the Special Issue Atmospheric Composition Observations)
Full-Text   |   PDF [1028 KB, uploaded 28 October 2015]   |  


The composition of aerosol from cloud droplets differs from that below cloud. Its implications for the Cloud Condensation Nuclei (CCN) activity are the focus of this study. Water-soluble organic matter from below cloud, and cloud droplet residuals off the coast of Monterey, California were collected; offline chemical composition, CCN activity and surface tension measurements coupled with Köhler Theory Analysis are used to infer the molar volume and surfactant characteristics of organics in both samples. Based on the surface tension depression of the samples, it is unlikely that the aerosol contains strong surfactants. The activation kinetics for all samples examined are consistent with rapid (NH4)2SO4 calibration aerosol. This is consistent with our current understanding of droplet kinetics for ambient CCN. However, the carbonaceous material in cloud drop residuals is far more hygroscopic than in sub-cloud aerosol, suggestive of the impact of cloud chemistry on the hygroscopic properties of organic matter. View Full-Text
Keywords: marine aerosol; organics; stratocumulus clouds; cloud condensation nuclei marine aerosol; organics; stratocumulus clouds; cloud condensation nuclei

Figure 1

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

Share & Cite This Article

MDPI and ACS Style

Asa-Awuku, A.; Sorooshian, A.; Flagan, R.C.; Seinfeld, J.H.; Nenes, A. CCN Properties of Organic Aerosol Collected Below and within Marine Stratocumulus Clouds near Monterey, California. Atmosphere 2015, 6, 1590-1607.

Show more citation formats Show less citations formats

Related Articles

Article Metrics

Article Access Statistics



[Return to top]
Atmosphere EISSN 2073-4433 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top