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Indirect Radiative Forcing by Ion-mediated Nucleation of Aerosol : Volume 12, Issue 7 (13/07/2012)

By Yu, F.

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Book Id: WPLBN0003996231
Format Type: PDF Article :
File Size: Pages 19
Reproduction Date: 2015

Title: Indirect Radiative Forcing by Ion-mediated Nucleation of Aerosol : Volume 12, Issue 7 (13/07/2012)  
Author: Yu, F.
Volume: Vol. 12, Issue 7
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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Ghan, S. J., Luo, G., Liu, X., Easter, R. C., Ma, X., & Yu, F. (2012). Indirect Radiative Forcing by Ion-mediated Nucleation of Aerosol : Volume 12, Issue 7 (13/07/2012). Retrieved from

Description: Atmospheric Sciences Research Center, State University of New York at Albany, 251 Fuller Road, Albany, NY 12203, USA. A clear understanding of particle formation mechanisms is critical for assessing aerosol indirect radiative forcing and associated climate feedback processes. Recent studies reveal the importance of ion-mediated nucleation (IMN) in generating new particles and cloud condensation nuclei (CCN) in the atmosphere. Here we implement for the first time a physically-based treatment of IMN into the Community Atmosphere Model version 5. Our simulations show that, compared to globally averaged results based on binary homogeneous nucleation (BHN), the presence of ionization (i.e., IMN) halves H2SO4 column burden, but increases the column integrated nucleation rate by around one order of magnitude, total particle number burden by a factor of ~3, CCN burden by ~10% (at 0.2% supersaturation) to 65% (at 1.0% supersaturation), and cloud droplet number burden by ~18%. Compared to BHN, IMN increases cloud liquid water path by 7.5%, decreases precipitation by 1.1%, and increases total cloud cover by 1.9%. This leads to an increase of total shortwave cloud radiative forcing (SWCF) by 3.67 W m−2 (more negative) and longwave cloud forcing by 1.78 W m−2 (more positive), with large spatial variations. The effect of ionization on SWCF derived from this study (3.67 W m−2) is a factor of ~3 higher that of a previous study (1.15 W m−2) based on a different ion nucleation scheme and climate model. The large sensitivity of cloud forcing to nucleation process again calls for improving representation of secondary particle formation processes and aerosol-cloud interactions in climate models.

Indirect radiative forcing by ion-mediated nucleation of aerosol

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