Journal
ATMOSPHERIC ENVIRONMENT
Volume 102, Issue -, Pages 112-121Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.atmosenv.2014.11.038
Keywords
Visibility; PM2.5; Backscatter and depolarization ratio; Regional haze episode; Yangtze River Delta
Funding
- National High Technology Research and Development Program of China (863 Program) [2013AA12A302]
- National Natural Science Foundation of China [41171330]
- Chinese Academy of Sciences [KZZD-EW-TZ-17]
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A severe prolonged regional haze episode occurred over the Yangtze River Delta (YRD) from 2 to 14 December 2013. In this paper, we have discussed the probable cause of haze episode and aerosol characteristics. Analysis of visibility and meteorological parameters suggest that the meteorological conditions play a very important role in the accumulation of aerosol particles that cause haze. The height of the planetary boundary layer (PBL) is considered as one of the key factors together with other factors in the haze formation. The Principal Component Analysis (PCA) clearly shows accumulation process of air pollutants from vehicular, industrial and anthropogenic sources are major contributors for the haze formation. The aerosol optical properties (aerosol optical depth AOD, Angstrom exponent - alpha and Ultra Violet Aerosol Index - UVAI) are analyzed to study the temporal and spatial variations of aerosol loadings. The results show concentrations of fine mode particles during the haze episode, the dust could have been also entered in the region from the northwestern China. Analysis of vertical aerosol profiles indicate that dust aerosols concentrated in the lower part of the haze layers. (C) 2014 Elsevier Ltd. All rights reserved.
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