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Enhanced organic ma...
Enhanced organic mass fraction and decreased hygroscopicity of cloud condensation nuclei (CCN) during new particle formation events
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Dusek, Ulrike (author)
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- Frank, Göran (author)
- Lund University,Lunds universitet,Kärnfysik,Fysiska institutionen,Institutioner vid LTH,Lunds Tekniska Högskola,Nuclear physics,Department of Physics,Departments at LTH,Faculty of Engineering, LTH
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Curtius, J. (author)
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Drewnick, F. (author)
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Schneider, J. (author)
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Kürten, A. (author)
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Rose, Diana (author)
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Andreae, Meinrat O. (author)
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Borrmann, S. (author)
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Pöschl, Ulrich (author)
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(creator_code:org_t)
- 2010
- 2010
- English.
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In: Geophysical Research Letters. - 1944-8007. ; 37
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Abstract
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- In a forested near-urban location in central Germany, the CCN efficiency of particles smaller than 100 nm decreases significantly during periods of new particle formation. This results in an increase of average activation diameters, ranging from 5 to 8% at supersaturations of 0.33% and 0.74%, respectively. At the same time, the organic mass fraction in the sub-100-nm size range increases from approximately 2/3 to 3/4. This provides evidence that secondary organic aerosol (SOA) components are involved in the growth of new particles to larger sizes, and that the reduced CCN efficiency of small particles is caused by the low hygroscopicity of the condensing material. The observed dependence of particle hygroscopicity (k) on chemical composition can be parameterized as a function of organic and inorganic mass fractions (forg, finorg) determined by aerosol mass spectrometry: k = korg forg + kinorg finorg. The obtained value of korg ~ 0.1 is characteristic for SOA, and kinorg ~ 0.7 is consistent with the observed mix of ammonium, sulfate and nitrate ions.
Subject headings
- NATURVETENSKAP -- Fysik -- Subatomär fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Subatomic Physics (hsv//eng)
Publication and Content Type
- art (subject category)
- ref (subject category)
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- By the author/editor
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Dusek, Ulrike
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Frank, Göran
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Curtius, J.
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Drewnick, F.
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Schneider, J.
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Kürten, A.
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show more...
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Rose, Diana
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Andreae, Meinrat ...
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Borrmann, S.
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Pöschl, Ulrich
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show less...
- About the subject
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
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and Subatomic Physic ...
- Articles in the publication
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Geophysical Rese ...
- By the university
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Lund University