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| Titel |
Diurnal variations of aerosol optical properties in the North China Plain and their influences on the estimates of direct aerosol radiative effect |
| VerfasserIn |
Y. Kuang, C. S. Zhao, J. C. Tao, N. Ma |
| 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 ; 15, no. 10 ; Nr. 15, no. 10 (2015-05-26), S.5761-5772 |
| Datensatznummer |
250119754
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| Publikation (Nr.) |
 copernicus.org/acp-15-5761-2015.pdf |
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| Zusammenfassung |
| In this paper, the diurnal variations of aerosol optical properties and
their influences on the estimation of daily average direct aerosol radiative
effect (DARE) in the North China Plain (NCP) are investigated based on
in situ measurements from Haze in China campaign. For ambient aerosol, the
diurnal patterns of single scattering albedo (SSA) and asymmetry factor
(g) in the NCP are both highest at dawn and lowest in the late afternoon,
and quite different from those of dry-state aerosol. The relative humidity
(RH) is the dominant factor which determines the diurnal pattern of SSA and g
for ambient aerosol. Basing on the calculated SSA and g, several cases are
designed to investigate the impacts of the diurnal changes of aerosol
optical properties on DARE. The results demonstrate that the diurnal changes
of SSA and g in the NCP have significant influences on the estimation of DARE
at the top of the atmosphere (TOA). If the full temporal coverage of aerosol
optical depth (AOD), SSA and g are available, an accurate estimation of daily
average DARE can be achieved by using the daily averages of AOD, SSA and g.
However, due to the lack of full temporal coverage data sets of SSA and g,
their daily averages are usually not available. Basing on the results of
designed cases, if the RH plays a dominant role in the diurnal variations of
SSA and g, we suggest that using both SSA and g averaged over early morning and
late afternoon as inputs for radiative transfer model to improve the
accurate estimation of DARE. If the temporal samplings of SSA or g are too few
to adopt this method, either averaged over early morning or late afternoon
of both SSA and g can be used to improve the estimation of DARE at the TOA. |
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