Aerosol measurements with a combined elastic/non-elastic backscatter lidar in Beijing

Zhenyi Chen; Wenqing Liu; Yujun Zhang; Nanjing Zhao; Junfeng He; Jun Ruan

doi:10.1117/12.834901

28 August 2009 Aerosol measurements with a combined elastic/non-elastic backscatter lidar in Beijing

Zhenyi Chen, Wenqing Liu, Yujun Zhang, Nanjing Zhao, Junfeng He, Jun Ruan

Proceedings Volume 7382, International Symposium on Photoelectronic Detection and Imaging 2009: Laser Sensing and Imaging; 73820M (2009) https://doi.org/10.1117/12.834901
Event: International Symposium on Photoelectronic Detection and Imaging 2009, 2009, Beijing, China

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.

Citation Download Citation

Zhenyi Chen, Wenqing Liu, Yujun Zhang, Nanjing Zhao, Junfeng He, and Jun Ruan "Aerosol measurements with a combined elastic/non-elastic backscatter lidar in Beijing", Proc. SPIE 7382, International Symposium on Photoelectronic Detection and Imaging 2009: Laser Sensing and Imaging, 73820M (28 August 2009); https://doi.org/10.1117/12.834901

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KEYWORDS

LIDAR

Aerosols

Backscatter

Mass attenuation coefficient

Ozone

Raman spectroscopy

Clouds

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