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| Titel |
An examination of parameterizations for the CCN number concentration based on in situ measurements of aerosol activation properties in the North China Plain |
| VerfasserIn |
Z. Z. Deng, C. S. Zhao, N. Ma, L. Ran, G. Q. Zhou, D. R. Lu, X. J. Zhou |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 13, no. 13 ; Nr. 13, no. 13 (2013-07-01), S.6227-6237 |
| Datensatznummer |
250018730
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| Publikation (Nr.) |
 copernicus.org/acp-13-6227-2013.pdf |
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| Zusammenfassung |
| Precise quantification of the cloud condensation nuclei (CCN) number
concentration is crucial for understanding aerosol indirect effects and
characterizing these effects in models. An evaluation of various methods for
CCN parameterization was carried out in this paper based on in situ
measurements of aerosol activation properties within HaChi (Haze in China)
project. Comparisons were made by closure studies between methods using CCN
spectra, bulk activation ratios, cut-off diameters and size-resolved
activation ratios. The estimation of CCN number concentrations by the method
using aerosol size-resolved activation ratios, either averaged over a day or
with diurnal variation, was found to be most satisfying and straightforward.
This could be well expected since size-resolved activation ratios include
information regarding the effects of size-resolved chemical compositions and
mixing states on aerosol activation properties. The method using the
averages of critical diameters, which were inferred from measured CCN number
concentrations and particle number size distributions, also provided a good
prediction of the CCN number concentration. Based on comparisons of all
these methods in this paper, it was recommended that the CCN number
concentration be predicted using particle number size distributions with
inferred critical diameters or size-resolved activation ratios. |
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