Enhanced organic mass fraction and decreased hygroscopicity of cloud condensation nuclei (CCN) during new particle formation events

被引：105

作者：

Dusek, U. ^{[3
]}

Frank, G. P. ^{[3
]}

Curtius, J. ^{[2
]}

Drewnick, F. ^{[1
]}

Schneider, J. ^{[1
]}

Kuerten, A. ^{[2
]}

Rose, D. ^{[3
]}

Andreae, M. O. ^{[3
]}

Borrmann, S. ^{[1
]}

Poeschl, U. ^{[3
]}

机构：

[1] Max Planck Inst Chem, Particle Chem Dept, D-55128 Mainz, Germany

[2] Johannes Gutenberg Univ Mainz, Inst Atmospher Phys, D-55099 Mainz, Germany

[3] Max Planck Inst Chem, Biogeochem Dept, D-55020 Mainz, Germany

来源：

GEOPHYSICAL RESEARCH LETTERS | 2010年 / 37卷

关键词：

AEROSOL-PARTICLES; NUCLEATION; SPECTROMETER; SULFATE; COUNTER; MODEL; AIR;

D O I：

10.1029/2009GL040930

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

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 (kappa) on chemical composition can be parameterized as a function of organic and inorganic mass fractions (f(org), f(inorg)) determined by aerosol mass spectrometry: kappa = kappa(org) f(org) + kappa(inorg) f(inorg). The obtained value of k(org) approximate to 0.1 is characteristic for SOA, and kappa(inorg) approximate to 0.7 is consistent with the observed mix of ammonium, sulfate and nitrate ions. Citation: Dusek, U., G. P. Frank, J. Curtius, F. Drewnick, J. Schneider, A. Kurten, D. Rose, M. O. Andreae, S. Borrmann, and U. Poschl (2010), Enhanced organic mass fraction and decreased hygroscopicity of cloud condensation nuclei (CCN) during new particle formation events, Geophys. Res. Lett., 37, L03804, doi: 10.1029/2009GL040930.

引用

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