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| Titel |
Column aerosol optical properties and aerosol radiative forcing during a serious haze-fog month over North China Plain in 2013 based on ground-based sunphotometer measurements |
| VerfasserIn |
H. Che, X. Xia, J. Zhu, Z. Li, O. Dubovik, B. Holben, P. Goloub, H. Chen, V. Estellés, E. Cuevas-Agulló, L. Blarel, H. Wang, H. Zhao, X. Zhang, Y. Wang, J. Sun, R. Tao, X. Zhang, G. Shi |
| 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 ; 14, no. 4 ; Nr. 14, no. 4 (2014-02-25), S.2125-2138 |
| Datensatznummer |
250118425
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| Publikation (Nr.) |
 copernicus.org/acp-14-2125-2014.pdf |
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| Zusammenfassung |
| In January 2013, North China Plain experienced several serious haze events.
Cimel sunphotometer measurements at seven sites over rural, suburban and
urban regions of North China Plain from 1 to 30 January 2013 were
used to further our understanding of spatial-temporal variation of aerosol
optical parameters and aerosol radiative forcing (ARF). It was found that
Aerosol Optical Depth at 500 nm (AOD500 nm) during non-pollution periods
at all stations was lower than 0.30 and increased significantly to greater
than 1.00 as pollution events developed. The Angstrom exponent (Alpha) was
larger than 0.80 for all stations most of the time. AOD500 nm averages
increased from north to south during both polluted and non-polluted periods
on the three urban sites in Beijing. The fine mode AOD during pollution
periods is about a factor of 2.5 times larger than that during the
non-pollution period at urban sites but a factor of 5.0 at suburban and
rural sites. The fine mode fraction of AOD675 nm was higher than
80% for all sites during January 2013. The absorption AOD675 nm at
rural sites was only about 0.01 during pollution periods, while
~0.03–0.07 and 0.01–0.03 during pollution and non-pollution
periods at other sites, respectively. Single scattering albedo varied
between 0.87 and 0.95 during January 2013 over North China Plain. The size
distribution showed an obvious tri-peak pattern during the most serious
period. The fine mode effective radius in the pollution period was about
0.01–0.08 μm larger than during non-pollution periods, while the
coarse mode radius in pollution periods was about 0.06–0.38 μm less
than that during non-pollution periods. The total, fine and coarse mode
particle volumes varied by about 0.06–0.34 μm3, 0.03–0.23 μm3,
and 0.03–0.10 μm3, respectively, throughout January
2013. During the most intense period (1–16 January), ARF at
the surface exceeded −50 W m−2, −180 W m−2, and −200 W m−2 at rural, suburban, and urban sites, respectively. The ARF
readings at the top of the atmosphere were approximately −30 W m−2 in
rural and −40–60 W m−2 in urban areas. Positive ARF at the top of the
atmosphere at the Huimin suburban site was found to be different from others
as a result of the high surface albedo due to snow cover. |
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