Enhanced organic mass fraction and decreased hygroscopicity of cloud condensation nuclei (CCN) during new particle formation events
Dusek, Ulrike ; Frank, Göran LU
; Curtius, J.
; Drewnick, F.
; Schneider, J.
; Kürten, A.
; Rose, Diana
; Andreae, Meinrat O.
; Borrmann, S.
and Pöschl, Ulrich
(2010)
In Geophysical Research Letters
37.
- Abstract
- 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
... (More) - 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. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/1615201
- author
- Dusek, Ulrike
; Frank, Göran
LU
; Curtius, J.
; Drewnick, F.
; Schneider, J.
; Kürten, A.
; Rose, Diana
; Andreae, Meinrat O.
; Borrmann, S.
and Pöschl, Ulrich
- organization
- publishing date
- 2010
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Geophysical Research Letters
- volume
- 37
- publisher
- American Geophysical Union (AGU)
- external identifiers
-
- scopus:76349099359
- ISSN
- 1944-8007
- DOI
- 10.1029/2009GL040930
- language
- English
- LU publication?
- yes
- additional info
- The information about affiliations in this record was updated in December 2015. The record was previously connected to the following departments: Nuclear Physics (Faculty of Technology) (011013007)
- id
- 2c182326-7859-4e46-8b09-9f4a20a8a2bc (old id 1615201)
- date added to LUP
- 2016-04-01 14:34:02
- date last changed
- 2025-04-04 14:49:46
@article{2c182326-7859-4e46-8b09-9f4a20a8a2bc,
abstract = {{In a forested near-urban location in central Germany, the<br/><br>
CCN efficiency of particles smaller than 100 nm decreases<br/><br>
significantly during periods of new particle formation. This<br/><br>
results in an increase of average activation diameters, ranging<br/><br>
from 5 to 8% at supersaturations of 0.33% and 0.74%,<br/><br>
respectively. At the same time, the organic mass fraction in<br/><br>
the sub-100-nm size range increases from approximately 2/3<br/><br>
to 3/4. This provides evidence that secondary organic aerosol<br/><br>
(SOA) components are involved in the growth of new<br/><br>
particles to larger sizes, and that the reduced CCN efficiency<br/><br>
of small particles is caused by the low hygroscopicity of<br/><br>
the condensing material. The observed dependence of<br/><br>
particle hygroscopicity (k) on chemical composition can<br/><br>
be parameterized as a function of organic and inorganic<br/><br>
mass fractions (forg, finorg) determined by aerosol mass<br/><br>
spectrometry: k = korg forg + kinorg finorg. The obtained value<br/><br>
of korg ~ 0.1 is characteristic for SOA, and kinorg ~ 0.7 is<br/><br>
consistent with the observed mix of ammonium, sulfate<br/><br>
and nitrate ions.}},
author = {{Dusek, Ulrike and Frank, Göran and Curtius, J. and Drewnick, F. and Schneider, J. and Kürten, A. and Rose, Diana and Andreae, Meinrat O. and Borrmann, S. and Pöschl, Ulrich}},
issn = {{1944-8007}},
language = {{eng}},
publisher = {{American Geophysical Union (AGU)}},
series = {{Geophysical Research Letters}},
title = {{Enhanced organic mass fraction and decreased hygroscopicity of cloud condensation nuclei (CCN) during new particle formation events}},
url = {{http://dx.doi.org/10.1029/2009GL040930}},
doi = {{10.1029/2009GL040930}},
volume = {{37}},
year = {{2010}},
}