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| Titel |
Characteristics, seasonality and sources of carbonaceous and ionic components in the tropical aerosols from Indian region |
| VerfasserIn |
C. M. Pavuluri, K. Kawamura, S. G. Aggarwal, T. Swaminathan |
| 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. 15 ; Nr. 11, no. 15 (2011-08-11), S.8215-8230 |
| Datensatznummer |
250010000
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| Publikation (Nr.) |
 copernicus.org/acp-11-8215-2011.pdf |
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| Zusammenfassung |
| To better characterize the tropical aerosols in Indian
region, PM10 samples collected from Chennai, India (13.04° N;
80.17° E) were analyzed for carbonaceous and water-soluble
ionic components. Concentration ranges of elemental carbon (EC) and organic
carbon (OC) were 2.4–14 μg m−3 (ave. 6.5 μg m−3) and
3.2–15.6 μg m−3 (ave. 9.1 μg m−3) in winter samples
whereas they were 1.1–2.5 μg m−3 (ave. 1.6 μg m−3) and
4.1–17.6 μg m−3 (ave. 9.7 μg m−3) in summer samples,
respectively. Concentration of secondary organic carbon (SOC) retrieved from
EC-tracer method was 4.6±2.8 μg m−3 in winter and
4.3±2.8 μg m−3 in summer. OC accounted for 38.5±14 % (n = 49)
of combined concentrations of carbonaceous and ionic components in
PM10. We also found that OC concentrations are generally higher than
those of SO42− (8.8±2.5 μg m−3 and
4.1±2.7 μg m−3 in winter and summer, respectively), which was the most
abundant ionic species (57 %) followed by NH4+ (15 %)
>NO3−>Cl−>K+>Na+>
Ca2+>MSA−>Mg2+.
The mass fractions of EC, organic matter (OM) and
ionic species varied seasonally, following the air mass trajectories and
corresponding source strength. Based on mass concentration ratios of
selected components and relations of EC and OC to marker species, we found
that biofuel/biomass burning is a major source of atmospheric aerosols in
South and Southeast Asia. The high concentrations of SOC and WSOC/OC ratios
(ave. 0.45; n = 49) as well as good correlations between SOC and WSOC
suggest that the secondary production of organic aerosols during long-range
atmospheric transport is also significant in this region. This study
provides the baseline data of carbonaceous aerosols for southern part of the
Indian subcontinent. |
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