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| Titel |
Aerosol hygroscopicity distribution concept and its applications in the cloud parcel modeling of CCN activation in the megacity air of Beijing |
| VerfasserIn |
Hang Su, Diana Rose, Ya Fang Cheng, Sachin S. Gunthe, Maria Berghof, Birgit Wehner, Andreas Massling, Alfred Wiedensohler, Meinrat O. Andreae, Ulrich Pöschl |
| Konferenz |
EGU General Assembly 2010
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 12 (2010) |
| Datensatznummer |
250042661
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| Zusammenfassung |
| This paper for the first time proposed a concept of hygroscopicity distribution (HD) for the
analysis and modeling of aerosol particle hygroscopicity and cloud condensation nucleus
(CCN) activity. The HD concept reflects the heterogeneous properties of aerosols
in the same size bin and corrects the misunderstanding in the traditional way of
reading a size-resolved CCN spectrum. Then results from the hygroscopicity (by a
CCN counter and a hygroscopicity tandem differential mobility analyzer, HTDMA)
and volatility measurements (by a volatility tandem differential mobility analyzer,
VTDMA) in the megacity Beijing were presented which confirmed the aerosol
heterogeneous properties (in the same size bin) and HD in the atmosphere. The
HD for polluted megacity air in Beijing exhibits a lognormally distributed mode
with hygroscopicity κ values around 0.2-0.4, and a significant particle fraction (ca.
10-20%) with κ values |
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