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Cloud Condensation Nuclei as a Modulator of Ice Processes in Arctic Mixed-phase Clouds : Volume 11, Issue 2 (25/02/2011)

By Lance, S.

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Book Id: WPLBN0003995934
Format Type: PDF Article :
File Size: Pages 34
Reproduction Date: 2015

Title: Cloud Condensation Nuclei as a Modulator of Ice Processes in Arctic Mixed-phase Clouds : Volume 11, Issue 2 (25/02/2011)  
Author: Lance, S.
Volume: Vol. 11, Issue 2
Language: English
Subject: Science, Atmospheric, Chemistry
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Publication Date:
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications


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Spackman, J. R., Schwarz, J. P., Moore, R. H., Cozic, J., Lance, S., Brioude, J.,...Froyd, K. D. (2011). Cloud Condensation Nuclei as a Modulator of Ice Processes in Arctic Mixed-phase Clouds : Volume 11, Issue 2 (25/02/2011). Retrieved from

Description: Chemical Sciences Division, Earth System Research Laboratory, National Oceanic and Atmospheric Administration, Boulder, CO, USA. We propose that cloud condensation nuclei (CCN) concentrations are important for modulating ice formation of Arctic mixed-phase clouds, through modification of the droplet size distribution. Aircraft observations from the Aerosol, Radiation, and Cloud Processes affecting Arctic Climate (ARCPAC) study in northern Alaska in April 2008 allow for identification and characterization of both aerosol and trace gas pollutants, which are then compared with cloud microphysical properties. Consistent with previous studies, we find that the concentration of precipitating ice particles (>400 μm) is correlated with the concentration of large droplets (>30 μm). We are further able to link the observed microphysical conditions to aerosol pollution, originating mainly from long range transport of biomass burning emissions. The case studies demonstrate that polluted mixed-phase clouds have narrower droplet size distributions and contain 1–2 orders of magnitude fewer precipitating ice particles than clean clouds at the same temperature. This suggests an aerosol indirect effect leading to greater cloud lifetime, greater cloud emissivity, and reduced precipitation. This result is opposite to the glaciation indirect effect, whereby polluted clouds are expected to precipitate more readily due to an increase in the concentration of particles acting as IN.

Cloud condensation nuclei as a modulator of ice processes in Arctic mixed-phase clouds

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