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Impact of emission controls on air quality in Beijing during APEC 2014: Lidar ceilometer observations

Tang, G.; Zhu, X.; Hu, B.; Xin, J.; Wang, L.; Muenkel, C.; Mao, G.; Wang, Y.

The implementation of emission reductions during the 2014 Asia-Pacific Economic Cooperation (APEC) summit provides a valuable opportunity to study air pollution in Beijing. From 15 October to 30 November 2014, the height of the atmospheric mixing layer and the vertical attenuated backscattering coefficient profiles were observed online using a lidar ceilometer. Compared with fine particulate matter (PM$_{2,5}$) and aerosol optical depth (AOD) data, the attenuated backscattering coefficients measured by the lidar ceilometer were strongly correlated with the PM$_{2,5}$ concentration and AOD (correlation coefficients of 0.89 and 0.86, respectively). This result demonstrated the reliability of the vertical distribution of particles measured by the lidar ceilometer. By classifying different degrees of air pollution based on visibility, we found that during the transition period of air pollution, which was affected by transport of southerly flows in the mixing layer, the attenuated backscattering coefficient from 0 to 1500m was enhanced by approximately 1.4Mm$^{-1}$ sr$^{-1}$ (140 %). During the polluted period, the attenuated backscattering coefficient from 0 to 300m suddenly increased, and the coefficient near the surface peaked (approximately 14Mm$^{-1}$ sr$^{-1}$); however, the attenuated backscattering coefficient from 300 to 900m decreased gradually, and the average value from 0 to 1500mdecreased by 0.5Mm$^{-1}$ sr$^{-1}$ (20 %). ... mehr

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DOI: 10.5445/IR/1000062072
DOI: 10.5194/acp-15-12667-2015
Zitationen: 139
Web of Science
Zitationen: 122
Zitationen: 121
Cover der Publikation
Zugehörige Institution(en) am KIT Fakultät für Physik (PHYSIK)
Institut für Meteorologie und Klimaforschung - Atmosphärische Umweltforschung (IMK-IFU)
KIT-Zentrum Klima und Umwelt (ZKU)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2015
Sprache Englisch
Identifikator ISSN: 1680-7316, 1680-7324
KITopen-ID: 1000062072
HGF-Programm 12.02.04 (POF III, LK 01) Urban-Rural Interactions
Erschienen in Atmospheric chemistry and physics
Verlag European Geosciences Union (EGU)
Band 15
Heft 21
Seiten 12667-12680
Nachgewiesen in Dimensions
Web of Science
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