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Sensitivity of CCN spectra on chemical and physical properties of aerosol: A case study from the Amazon Basin

Roberts, G C; Artaxo, P; Zhou, Jingchuan LU ; Swietlicki, Erik LU and Andreae, M O (2002) In Journal of Geophysical Research 107(D20). p.8070-8070
Abstract
Organic material, about half of which is water soluble, constitutes nearly 80% of the wet-season aerosol mass in the Amazon Basin, while soluble inorganic salts (predominantly ammonium bisulfate) represent about 15%. A detailed analysis of number distributions and the size-dependent chemical composition of the aerosol indicates that, in principle, the sulfate fraction could account for most of the cloud condensation nuclei (CCN) activity. Uncertainty about the chemical speciation of the water-soluble organic component precludes a rigorous analysis of its contribution to nucleation activity. Within reasonable assumptions, we can, however, predict a similar contribution of the organic component to CCN activity as that from sulfate. Because... (More)
Organic material, about half of which is water soluble, constitutes nearly 80% of the wet-season aerosol mass in the Amazon Basin, while soluble inorganic salts (predominantly ammonium bisulfate) represent about 15%. A detailed analysis of number distributions and the size-dependent chemical composition of the aerosol indicates that, in principle, the sulfate fraction could account for most of the cloud condensation nuclei (CCN) activity. Uncertainty about the chemical speciation of the water-soluble organic component precludes a rigorous analysis of its contribution to nucleation activity. Within reasonable assumptions, we can, however, predict a similar contribution of the organic component to CCN activity as that from sulfate. Because of the nonlinear dependence of droplet nucleation behavior on solute amount, the nucleation activity cannot be attributed uniquely to the inorganic or organic fractions. The role of water-soluble organic compounds as surfactants, however, may be significant (especially in the case of biomass-burning aerosol) and more field measurements are needed to quantify their effects on the surface tension of ambient aerosols. The parametric dependence of the CCN spectra on the physical and chemical properties of the aerosol show that the number distribution, soluble content of the aerosol, and surface tension effects all play an important role in determining CCN spectra. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Journal of Geophysical Research
volume
107
issue
D20
pages
8070 - 8070
publisher
American Geophysical Union
external identifiers
  • WOS:000180466200026
ISSN
2156-2202
DOI
10.1029/2001JD000583
language
English
LU publication?
yes
id
c0868274-d5a6-4641-b01a-6095f1082d63 (old id 714094)
date added to LUP
2007-12-11 11:38:13
date last changed
2016-04-16 10:37:30
@misc{c0868274-d5a6-4641-b01a-6095f1082d63,
  abstract     = {Organic material, about half of which is water soluble, constitutes nearly 80% of the wet-season aerosol mass in the Amazon Basin, while soluble inorganic salts (predominantly ammonium bisulfate) represent about 15%. A detailed analysis of number distributions and the size-dependent chemical composition of the aerosol indicates that, in principle, the sulfate fraction could account for most of the cloud condensation nuclei (CCN) activity. Uncertainty about the chemical speciation of the water-soluble organic component precludes a rigorous analysis of its contribution to nucleation activity. Within reasonable assumptions, we can, however, predict a similar contribution of the organic component to CCN activity as that from sulfate. Because of the nonlinear dependence of droplet nucleation behavior on solute amount, the nucleation activity cannot be attributed uniquely to the inorganic or organic fractions. The role of water-soluble organic compounds as surfactants, however, may be significant (especially in the case of biomass-burning aerosol) and more field measurements are needed to quantify their effects on the surface tension of ambient aerosols. The parametric dependence of the CCN spectra on the physical and chemical properties of the aerosol show that the number distribution, soluble content of the aerosol, and surface tension effects all play an important role in determining CCN spectra.},
  author       = {Roberts, G C and Artaxo, P and Zhou, Jingchuan and Swietlicki, Erik and Andreae, M O},
  issn         = {2156-2202},
  language     = {eng},
  number       = {D20},
  pages        = {8070--8070},
  publisher    = {ARRAY(0x9d794c0)},
  series       = {Journal of Geophysical Research},
  title        = {Sensitivity of CCN spectra on chemical and physical properties of aerosol: A case study from the Amazon Basin},
  url          = {http://dx.doi.org/10.1029/2001JD000583},
  volume       = {107},
  year         = {2002},
}