References

ACP

Atmospheric Chemistry and Physics

ACP

1680-7324

Copernicus GmbH

Göttingen, Germany

10.5194/acp-11-12369-2011

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

Cerully

K. M.

¹ Raatikainen

² ³ Lance

⁴ ⁵ Tkacik

⁶ Tiitta

⁷ ⁸ Petäjä

⁹ Ehn

⁹ ¹³ Kulmala

⁹ Worsnop

D. R.

³ ⁷ ⁹ ¹⁰ Laaksonen

³ ⁷ Smith

J. N.

⁷ ¹¹ Nenes

¹ ² ¹²

School of Chemical and Biomolecular Engineering, Georgia Institute of Technology, Atlanta, GA, USA

School of Earth and Atmospheric Science, Georgia Institute of Technology, Atlanta, GA, USA

Finnish Meteorological Institute, Helsinki, Finland

Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, CO, USA

Earth System Research Laboratory, National Oceanic and Atmospheric Administration, Boulder, CO, USA

Center for Atmospheric Particle Studies, Carnegie Mellon University, Pittsburgh, PA, USA

Department of Applied Physics, University of Eastern Finland, Kuopio, Finland

Atmospheric Chemistry Research Group, North-West University, Potchefstroom, South Africa

Department of Physics, University of Helsinki, Helsinki, Finland

Aerodyne Research Incorporated, Billerica, MA, USA

National Center for Atmospheric Research, Boulder, CO, USA

Institute of Chemical Engineering and High-Temperature Chemical Processes, Foundation for Research and Technology Hellas, Patras, Greece

currently at: Institute for Energy and Climate Research, Forschungszentrum Jülich, Jülich, Germany

09 12 2011

11 23 12369 12386

This is an open-access article ditributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

This article is available from http://www.atmos-chem-phys.net/11/12369/2011/acp-11-12369-2011.html

The full text article is available as a PDF file from http://www.atmos-chem-phys.net/11/12369/2011/acp-11-12369-2011.pdf

Measurements of size-resolved cloud condensation nuclei (CCN) concentrations, 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 characteristic of highly oxidized organics of 0.20 ± 0.10, indicating that organics play a dominant role for 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 organics in 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 most of the CCN activate as rapidly as (NH4)2SO4 calibration aerosol.

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