 |
| Titel |
A parameterization of low visibilities for hazy days in the North China Plain |
| VerfasserIn |
J. Chen, C. S. Zhao, N. Ma, P. F. Liu, T. Göbel, E. Hallbauer, Z. Z. Deng, L. Ran, W. Y. Xu, Z. Liang, H. J. Liu, P. Yan, X. J. Zhou, A. Wiedensohler |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1680-7316
|
| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 12, no. 11 ; Nr. 12, no. 11 (2012-06-06), S.4935-4950 |
| Datensatznummer |
250011222
|
| Publikation (Nr.) |
 copernicus.org/acp-12-4935-2012.pdf |
|
|
|
|
|
| Zusammenfassung |
| Visibility degradation is a pervasive and urgent environmental problem in
China. The occurrence of low visibility events is frequent in the North
China Plain, where the aerosol loading is quite high and aerosols are
strongly hygroscopic. A parameterization of light extinction (Kex) for
low visibilities on hazy days is proposed in this paper, based on
visibility, relative humidity (RH), aerosol hygroscopic growth factors and
particle number size distributions measured during the Haze in China (HaChi)
Project. Observational results show that a high aerosol volume concentration
is responsible for low visibility at RH <90%; while for RH
>90%, decrease of visibility is mainly influenced by the
increase of RH. The parameterization of Kex is developed on the basis
of aerosol volume concentrations and RH, taking into accounts the
sensitivity of visibility to the two factors and the availability of
corresponding data. The extinction coefficients calculated with the
parameterization schemes agree well with the directly measured values. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|