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Aerosol Optical Hygroscopicity Measurements During the 2010 Cares Campaign : Volume 14, Issue 22 (10/12/2014)

By Atkinson, D. B.

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Book Id: WPLBN0003987943
Format Type: PDF Article :
File Size: Pages 45
Reproduction Date: 2015

Title: Aerosol Optical Hygroscopicity Measurements During the 2010 Cares Campaign : Volume 14, Issue 22 (10/12/2014)  
Author: Atkinson, D. B.
Volume: Vol. 14, Issue 22
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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Cziczo, D. J., Cappa, C. D., Zhang, Q., Atkinson, D. B., Lum, J., Kolesar, K. R.,...Zelenyuk, A. (2014). Aerosol Optical Hygroscopicity Measurements During the 2010 Cares Campaign : Volume 14, Issue 22 (10/12/2014). Retrieved from

Description: Department of Chemistry, Portland State University, Portland, OR, 97207, USA. Measurements of the effect of water uptake on particulate light extinction or scattering made at two locations during the 2010 CARES study around Sacramento, CA are reported. The observed influence of water uptake, characterized through the dimensionless optical hygroscopicity parameter γ, is compared with calculations constrained by observed particle size distributions and size-dependent particle composition. A closure assessment has been carried out that allowed for determination of the average hygroscopic growth factors (GF) at 85% relative humidity and the dimensionless hygroscopicity parameter κ for oxygenated organic aerosol (OA) and for supermicron particles, yielding Κ = 0.1–0.15 and 0.9–1.0, respectively. The derived range of oxygenated OA Κ values are in line with previous observations. The relatively large values for supermicron particles is consistent with substantial contributions of sea salt-containing particles in this size range. Analysis of time-dependent variations in the supermicron particle hygroscopicity suggest that atmospheric processing, specifically chloride displacement by nitrate and the accumulation of secondary organics on supermicron particles, can lead to substantial depression of the observed GF.

Aerosol optical hygroscopicity measurements during the 2010 CARES Campaign

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