Observation and Analysis of a Haze Process in Perl River Delta Region Using Lidar

Abstract

Abstract:

Aerosol optical and microphysical parameters of particles under severe haze polluted condition in the Pearl River Delta (PRD) in Southern China in November 2009 were observed by using Raman-Mie polarized lidar. It was found that the haze layer was distributed below 1.5 km, and the concentration of haze layer was comparatively thicker at the heigh of 600~1000 m, the characteristics of dust haze were analyzed and discussed. In the beginning, the depolarization ratio in 532nm wavelength is 0.2, Ångström exponent and lidar ratio of the haze were 1±0.4 and 40±8 sr, respectively. It meant that there was a large number of non-spherical particles and large size particles in the haze particles, it was in line with characteristics of anthropogenic emissions particles. After November 26, 2009, the depolarization ratio in 532 nm wavelength of haze particles gradually decreases to 0.07 ± 0.02, Ångström exponent and lidar ratio also changed to 1.5±0.6 and 56±12 sr, respectively. It was proved that there was a larger proportion of fine particles in haze, and the particles were mostly spherical particles. It meant that a large number of the second particles were generated after November 25, which aggravated the haze pollution. The result indicated that at the beginning, some artificial particles resulted in the light haze, these artificial source provided the condition for compound air pollution, with the second particle generating, the haze pollution was further aggravated.

Key words: lidar, atmospheric particulate mass, haze, extinction coefficient, depolarization ratio

CLC Number:

TN958.98

HUANG Zu-Zhao, DONG Yun-Sheng, LIU Jian-Guo, LIU Wen-Qing, LIU Yi-Fu, ZHAO Xue-Song, ZHANG Tian-Shu, LI Tie. Observation and Analysis of a Haze Process in Perl River Delta Region Using Lidar[J]. Journal of Atmospheric and Environmental Optics, 2013, 8(2): 114-123.

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