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Proceedings Paper

Aerosol measurements with a combined elastic/non-elastic backscatter lidar in Beijing
Author(s): Zhenyi Chen; Wenqing Liu; Yujun Zhang; Nanjing Zhao; Junfeng He; Jun Ruan
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Paper Abstract

In order to reach a green Olympics in 2008, an unprecedented environmental experiment jointly launched by the Beijing municipal government and the Chinese Academy of Sciences (CAS) was carried out. AIOFM (Anhui Institute of Optics and Fine Mechanics Experiment) took part in the campaign with an elastic/non-elastic lidar to measure the aerosol distribution and the boundary layer in summer in Beijing. With the combining solution of the Raman lidar and the elastic lidar equation, the important optical parameters of the aerosols (extinction coefficient, backscatter coefficients thus the lidar ratio) were attained. The lidar ratio on July 22 varied from 10sr to 30sr. Since the vertical distribution of the lidar ratio demonstrate different microphysical characteristics in the lower and upper parts of the cloud, so probably the cirrus with the mean lidar ratio of 25sr at the height of 6km can be assumed. On the other hand, a well-mixed boundary layer was observed. Taking into account the effects of the multiple scattering (5%-10%),we obtain a single-scattering optical depth of 0.15.The boundary layer also offered the explanation of the steady ozone concentration measured by the DOAS system at the same position of the observing site.

Paper Details

Date Published: 28 August 2009
PDF: 8 pages
Proc. SPIE 7382, International Symposium on Photoelectronic Detection and Imaging 2009: Laser Sensing and Imaging, 73820M (28 August 2009); doi: 10.1117/12.834901
Show Author Affiliations
Zhenyi Chen, Anhui Institute of Optics and Fine Mechanics (China)
Wenqing Liu, Anhui Institute of Optics and Fine Mechanics (China)
Yujun Zhang, Anhui Institute of Optics and Fine Mechanics (China)
Nanjing Zhao, Anhui Institute of Optics and Fine Mechanics (China)
Junfeng He, Anhui Institute of Optics and Fine Mechanics (China)
Jun Ruan, Anhui Institute of Optics and Fine Mechanics (China)


Published in SPIE Proceedings Vol. 7382:
International Symposium on Photoelectronic Detection and Imaging 2009: Laser Sensing and Imaging
Farzin Amzajerdian; Chun-qing Gao; Tian-yu Xie, Editor(s)

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