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| Titel |
Source apportionment of major and trace elements in aerosols during smog
episodes in large cities in China |
| VerfasserIn |
Markus Furger, Pragati Rai, Suzanne Visser, Miriam Elser, Francesco Canonaco, Jay G. Slowik, Ru-Jin Huang, André S. H. Prévôt, Urs Baltensperger |
| Konferenz |
EGU General Assembly 2017
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 19 (2017) |
| Datensatznummer |
250140893
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| Publikation (Nr.) |
 EGU/EGU2017-4344.pdf |
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| Zusammenfassung |
| Air pollution in Chinese cities is one of the environmental problems China has to address to
mitigate the impacts on human health, air quality and climate. Average concentrations of
particulate matter exceed 100 μg m−3 in many places in China, and the government is
developing and implementing strategies to reduce the load of pollutants by various
measures. A characterization of airborne particulate matter (PM), especially its
composition and sources, will help in optimizing reduction and mitigation strategies for air
pollution.
We collected PM10 aerosols with a rotating drum impactor (RDI) in Xi’an in December
2013 and in Beijing in January 2014 with 30-min time resolution and for three size ranges
(cut-off sizes 10, 2.5 and 1 μm). Each campaign encompassed one or more high
pollution episodes in the respective city. Elements from Na to Pb were analyzed with
synchrotron radiation induced X-ray fluorescence spectrometry (SR-XRF), and
the resulting time series were used for source apportionment performed with the
Multilinear-Engine 2 (ME-2) implementation of the Positive Matrix Factorization
algorithm.
The preliminary computations yielded 5 factors for Beijing, namely road dust, sea salt,
traffic-related, industrial, coal combustion. For Xi’an an additional desert dust factor was
found. Further refinement could be expected from including the smaller size fractions, e.g. a
sulfur-rich factor for secondary sulfate or a reacted chlorine factor in the fine mode fraction. |
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