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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
Aerosol hygroscopicity and CCN activation kinetics in a boreal forest environment during the 2007 EUCAARI campaign
Atmospheric Chemistry and Physics, Volume 11, No. 23, Year 2011
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Description
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 (NH 4) 2SO 4 calibration aerosol. © 2011 Author(s).
Authors & Co-Authors
Cerully, K. M.
United States, Atlanta
Georgia Institute of Technology
Raatikainen, T.
United States, Atlanta
Georgia Institute of Technology
Finland, Helsinki
Finnish Meteorological Institute
Lance, S.
United States, Boulder
University of Colorado Boulder
United States, Boulder
Noaa Earth System Research Laboratory
Tkacik, D.
United States, Pittsburgh
Carnegie Mellon University
Tiitta, Petri T.
Finland, Kuopio
Itä-suomen Yliopisto
South Africa, Potchefstroom
North-west University
Petäj̈ä, Tuukka
Finland, Helsinki
Helsingin Yliopisto
Ehn, Mikael
Finland, Helsinki
Helsingin Yliopisto
Germany, Julich
Forschungszentrum Jülich Gmbh
Kulmala, Markku
Finland, Helsinki
Helsingin Yliopisto
Worsnop, Douglas R.
Finland, Helsinki
Finnish Meteorological Institute
Finland, Kuopio
Itä-suomen Yliopisto
Finland, Helsinki
Helsingin Yliopisto
United States, Billerica
Aerodyne Research, Inc.
Laaksonen, Ari
Finland, Helsinki
Finnish Meteorological Institute
Finland, Kuopio
Itä-suomen Yliopisto
Smith, J. N.
Finland, Kuopio
Itä-suomen Yliopisto
United States, Boulder
National Center for Atmospheric Research
Nenes, Athanasios
United States, Atlanta
Georgia Institute of Technology
Greece, Patra
Institute of Chemical Engineering Sciences
Statistics
Citations: 109
Authors: 12
Affiliations: 12
Identifiers
Doi:
10.5194/acp-11-12369-2011
ISSN:
16807316
e-ISSN:
16807324
Research Areas
Environmental