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| Titel |
Classification and investigation of Asian aerosol absorptive properties |
| VerfasserIn |
T. Logan, B. Xi, X. Dong, Z. Li, M. Cribb |
| 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. 4 ; Nr. 13, no. 4 (2013-02-26), S.2253-2265 |
| Datensatznummer |
250018435
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| Publikation (Nr.) |
 copernicus.org/acp-13-2253-2013.pdf |
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| Zusammenfassung |
| Asian aerosols are among the most complex yet widely studied components of
the atmosphere not only due to their seasonal variability but also their
effects on climate change. Four Aerosol Robotic Network (AERONET) sites have
been selected to represent aerosol properties dominated by pollution (Taihu),
mixed complex particle types (Xianghe), desert-urban (SACOL), and biomass
(Mukdahan) in East Asia during the 2001–2010 period. The volume size
distribution, aerosol optical depth (τ and τabs),
Ångström exponent (α and αabs), and the
single scattering co-albedo (ωoabs) parameters over the four
selected sites have been used to (a) illustrate seasonal changes in aerosol
size and composition and (b) discern the absorptive characteristics of black
carbon (BC), organic carbon (OC), mineral dust particles, and mixtures. A
strongly absorbing mineral dust influence is seen at the Xianghe, Taihu, and
SACOL sites during the spring months (MAM), as given by coarse mode dominance,
mean α440–870 < 1, and mean αabs440–870 > 1.5.
There is a shift towards weakly absorbing pollution (sulfate) and biomass
(OC) aerosol dominance in the summer (JJA) and autumn (SON) months, as given
by a strong fine mode influence, α440–870 > 1, and
αabs440–870 < 1.5. A winter season (DJF) shift toward
strongly fine mode, absorbing particles (BC and OC) is observed at Xianghe
and Taihu (αabs440–870 > 1 and αabs440–870 > 1.5). At
Mukdahan, a strong fine mode influence is evident year round, with weakly and
strongly absorbing biomass particles dominant in the autumn and winter
months, respectively, while particles exhibit variable absorption during the
spring season. A classification method using α440–870 and
ωoabs440 is developed in order to infer the seasonal
physico-chemical properties of the aerosol types, such as fine and coarse
mode, weak and strong absorption, at the four selected Asian sites. |
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