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| Titel |
Chemical characterization of aerosols at the summit of Mountain Tai in Central East China |
| VerfasserIn |
C. Deng, G. Zhuang, K. Huang, J. Li, R. Zhang, Q. Wang, T. Liu, Y. Sun, Z. Guo, J. S. Fu, Z. Wang |
| 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 ; 11, no. 14 ; Nr. 11, no. 14 (2011-07-25), S.7319-7332 |
| Datensatznummer |
250009948
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| Publikation (Nr.) |
 copernicus.org/acp-11-7319-2011.pdf |
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| Zusammenfassung |
| PM2.5 and TSP samples were collected at the summit of Mountain Tai (MT)
(1534 m a.s.l.) in spring 2006/2007 and summer 2006 to investigate the
characteristics of aerosols over central eastern China. For comparison,
aerosol samples were also collected at Tazhong, Urumqi, and Tianchi in
Xinjiang in northwestern China, Duolun and Yulin in northern China, and two
urban sites in the megacities, Beijing and Shanghai, in 2007. Daily mass
concentrations of TSP and PM2.5 ranged from 39.6–287.6 μg m−3
and 17.2–235.7 μg m−3 respectively at the summit of MT. Averaged
concentrations of PM2.5 showed a pronounced seasonal variation with
higher concentration in summer than spring. 17 water-soluble ions
(SO42−, NO3−, Cl−, F−, PO43−, NO2−, CH3COO−, CH2C2O42−,
C2H4C2O42−, HCOO−, MSA, C2O42−, NH4+, Ca2+, K+, Mg2+, Na+), and 19 elements of
all samples were measured. SO42−, NO3−, and
NH4+ were the major water-soluble species in PM2.5,
accounting for 61.50 % and 72.65 % of the total measured ions in spring
and summer, respectively. The average ratio of PM2.5/TSP was 0.37(2006)
and 0.49(2007) in spring, while up to 0.91 in summer, suggesting that
aerosol particles were primarily comprised of fine particles in summer and
of considerable coarse particles in spring. Crustal elements (e.g., Ca, Mg,
Al, Fe, etc.) showed higher concentration in spring than summer, while most
of the pollution species (SO42−, NO3−, K+,
NO2−, NH4+, Cl−, organic acids, Pb, Zn, Cd, and Cr)
from local/regional anthropogenic emissions or secondary formation presented
higher concentration in summer. The ratio of Ca/Al suggested the impact of
Asian dust from the western deserts on the air quality in this region. The
high concentration of K+ in PM2.5 (4.41 μg m−3) and its
good correlation with black carbon (r = 0.90) and oxalic acid (r = 0.87) suggested
the severe pollution from biomass burning, which was proved to be a main
source of fine particles over central eastern China in summer. The
contribution of biomass burning to the fine particle at MT accounted for
7.56 % in spring and 36.71 % in summer, and even reached to 81.58 % on
a day. As and Pb were two of the most enriched elements. The long-range
transport of aerosols spread the heavy pollution from coal-mining/coal-ash
to everywhere over China. Anthropogenic air-pollution was evidently rather
severe at MT, though it has been declared by UNESCO to be a World Heritage site. |
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