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Aerosol Hygroscopicity and Ccn Activation Kinetics in a Boreal Forest Environment During the 2007 Eucaari Campaign : Volume 11, Issue 5 (18/05/2011)

By Cerully, K. M.

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Book Id: WPLBN0003973606
Format Type: PDF Article :
File Size: Pages 46
Reproduction Date: 2015

Title: Aerosol Hygroscopicity and Ccn Activation Kinetics in a Boreal Forest Environment During the 2007 Eucaari Campaign : Volume 11, Issue 5 (18/05/2011)  
Author: Cerully, K. M.
Volume: Vol. 11, Issue 5
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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Lance, S., Tkacik, D., Nenes, A., Smith, J. N., Petäjä, T., Raatikainen, T.,...Kulmala, M. (2011). Aerosol Hygroscopicity and Ccn Activation Kinetics in a Boreal Forest Environment During the 2007 Eucaari Campaign : Volume 11, Issue 5 (18/05/2011). Retrieved from

Description: School of Chemical and Biomolecular Engineering, Georgia Institute of Technology, Atlanta, GA, USA. Measurements of size-resolved cloud condensation nuclei (CCN), subsaturated hygroscopic growth, size distribution, and chemical composition were collected from March through May, 2007, in the remote Boreal forests of Hyytiälä, Finland, as part of the European Integrated project on Aerosol Cloud Climate and Air Quality Interactions (EUCAARI) campaign. Hygroscopicity parameter, κ, distributions were derived independently from Continuous Flow-Streamwise Thermal Gradient CCN Chamber (CFSTGC) and Hygroscopicity Tandem Differential Mobility Analyzer (HTDMA) measurements. CFSTGC-derived κ values for 40, 60, and 80 nm particles range mostly between 0.10 and 0.40 with an average of 0.20 ± 0.10; this is characteristic of highly oxidized organics and reflect their dominant influence in this environment. HTDMA-derived κ were generally 30 % lower. Diurnal trends of κ show a minimum at sunrise and a maximum in the late afternoon; this trend covaries with inorganic mass fraction and the m/z 44 organic mass fraction given by a quadrupole aerosol mass spectrometer, further illustrating the importance of ageing on aerosol hygroscopicity. The chemical dispersion inferred from the observed κ distributions indicates that while 60 and 80 nm dispersion increases around midday, 40 nm dispersion remains constant. Additionally, 80 nm particles show a markedly higher level of chemical dispersion than both 40 and 60 nm particles. An analysis of droplet activation kinetics for the sizes considered indicates that the CCN activate as rapidly as (NH4)2SO4 calibration aerosol.

Aerosol hygroscopicity and CCN activation kinetics in a boreal forest environment during the 2007 EUCAARI campaign

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