J4 ›› 2016, Vol. 33 ›› Issue (1): 98-105.

• Laser Applications • Previous Articles     Next Articles

Simulation of Lidar Ratios and Angstr?m Exponents of Different Aerosols

SONG Yue-hui, SHI Li-li, LU Lei-lei, LI Shi-chun, XIN Wen-hui,YAN Qing, HUA Deng-xin   

  1. School of Mechanical and Precision Instrument Engineering, Xi’ an University of Technology, Xi’an 710048, China
  • Received:2015-10-16 Revised:2015-11-02 Published:2016-01-28 Online:2016-01-06

Abstract:

Based on the theory of Mie scattering and assumption of particle size distribution, lidar ratios and angstr?m exponents of kinds of aerosols are simulated, for studying the relationships between these two parameters and the wavelength of incident light, the size and the refractive index of aerosols. The simulation results show that the lidar ratios of water clouds and fog at 355nm, 532nm and 1064nm are all approximately 19sr, and the absolute value of their angstr?m exponents are very small, revealing that there is no obvious dependency between extinction coefficient and wavelength. Due to the strong absorption of soot, the lidar ratios of continental aerosols are found to be positively correlated with the content of soot. The continental aerosols have the maximum lidar ratio at 532nm, the mean value of Angstr?m coefficients is approximately 1.3, and their extinction coefficients decrease with wavelength. The simulation results can provide important scientific data for studying the scattering properties, which is very important for finding the deep law of aerosols scattering and fine retrieving of the aerosols’ optical characteristics

Key words: atmospheric optics, lidar ratio, angström exponent, simulation calculation, aerosol