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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.

Abstract:
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 backscatter ... mehr


Zugehörige Institution(en) am KIT Institut für Meteorologie und Klimaforschung - Atmosphärische Umweltforschung (IMK-IFU)
Publikationstyp Zeitschriftenaufsatz
Jahr 2015
Sprache Englisch
Identifikator DOI: 10.5194/acp-15-12667-2015
ISSN: 1680-7316, 1680-7324
URN: urn:nbn:de:swb:90-620720
KITopen ID: 1000062072
HGF-Programm 12.02.04; LK 01
Erschienen in Atmospheric chemistry and physics
Band 15
Heft 21
Seiten 12667-12680
Lizenz CC BY 3.0 DE: Creative Commons Namensnennung 3.0 Deutschland
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