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| Titel |
A case study of dust aerosol radiative properties over Lanzhou, China |
| VerfasserIn |
L. Zhang, X. Cao, J. Bao, B. Zhou, J. Huang, J. Shi, J. Bi |
| 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 ; 10, no. 9 ; Nr. 10, no. 9 (2010-05-07), S.4283-4293 |
| Datensatznummer |
250008428
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| Publikation (Nr.) |
 copernicus.org/acp-10-4283-2010.pdf |
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| Zusammenfassung |
The vertical distribution of dust aerosol and its radiative properties are
analysed using the data measured by the micropulse lidar, profiling
microwave radiometer, sunphotometer, particulate monitor, and nephelometer
at the Semi-Arid Climate and Environment Observatory of Lanzhou University
(SACOL) during a dust storm from 27 March to 29 March 2007. The analysis
shows that the dust aerosol mainly exists below 2 km in height, and the dust
aerosol extinction coefficient decreases with height. The temporal evolution
of aerosol optical depth (AOD) during the dust storm is characterized by a
sub-maximum at 22:00 (Beijing Time), 27 March and a maximum at 12:00, 28
March. The AOD respectively derived by lidar and sunphotometer shows a good
consistency. The PM10 concentration and aerosol scattering coefficient
share similar variation trends, and their maximums both appear at 22:00, 27
March.
The aerosol extinction coefficient and relative humidity have the similar
trends and their maximums almost appear at the same heights, which presents
a correlation between extinction coefficient and relative humidity known as
aerosol hygroscopicity. The relative humidity is related with temperature,
and then the temperature will affect the aerosol extinction properties by
modifying the relative humidity condition.
The aerosol extinction coefficient, scattering coefficient, and PM10
concentration present good linear correlations. The correlation coefficients
of the aerosol scattering coefficients of 450, 520, and 700 nm and PM10
concentration, of aerosol extinction coefficient retrieved by lidar at 532
nm and PM10 concentration, and of aerosol extinction and scattering
coefficient are respectively 0.98, 0.94, and 0.96. |
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