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| Titel |
Impact of biomass burning on haze pollution in the Yangtze River delta, China: a case study in summer 2011 |
| VerfasserIn |
Z. Cheng, S. Wang, X. Fu, J. G. Watson, J. Jiang, Q. Fu, C. Chen, B. Xu, J. Yu, J. C. Chow, J. Hao |
| 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 ; 14, no. 9 ; Nr. 14, no. 9 (2014-05-12), S.4573-4585 |
| Datensatznummer |
250118690
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| Publikation (Nr.) |
 copernicus.org/acp-14-4573-2014.pdf |
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| Zusammenfassung |
| Open biomass burning is an important source of air pollution in China and
globally. Joint observations of air pollution were conducted in five cities
(Shanghai, Hangzhou, Ningbo, Suzhou and Nanjing) of the Yangtze River delta,
and a heavy haze episode with visibility 2.9–9.8 km was observed from 28
May to 6 June 2011. The contribution of biomass burning was quantified using
both ambient monitoring data and the WRF/CMAQ (Weather Research and
Forecasting (WRF) and Community Multiscale Air Quality (CMAQ)) model
simulation. It was found that the average and maximum daily PM2.5
concentrations during the episode were 82 and
144 μgm−3, respectively. Weather pattern analysis indicated
that stagnation enhanced the accumulation of air pollutants, while the
following precipitation event scavenged the pollution. Mixing depth during
the stagnant period was 240–399 m. Estimation based on observation data and
CMAQ model simulation indicated that biomass open burning contributed
37% of PM2.5, 70% of organic carbon and 61% of elemental
carbon. Satellite-detected fire spots, back-trajectory analysis and air
quality model simulation were integrated to identify the locations where the
biomass was burned and the pollutants transport. The results suggested that
the impact of biomass open burning is regional, due to the substantial
inter-province transport of air pollutants. PM2.5 exposure level could
be reduced 47% for the YRD region if complete biomass burning is
forbidden and significant health benefit is expected. These findings could
improve the understanding of heavy haze pollution, and suggest the need to
ban open biomass burning during post-harvest seasons. |
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