干旱区生态环境知识资源中心

The optical radiation and radiation transfer characteristics of atmospheric particulate matter (PM) in mining area of northwest China were simulated and analyzed in this paper. Computational fluid dynamics (CFD) method was adopted to simulate the distribution of PM considering the local desertification and mining activities. The 1-D radiative transfer equation was solved using discrete ordinates method combined with Mie scattering model based on the CFD simulation results. The spectral aerosol optical depth and transmission characteristics of PM polluted atmosphere in the wavelength of 1-25 mu m under different intensity of dust releases, wind speeds and dust compositions were obtained and analyzed. The simulation results show that: the transmission characteristics are obviously enhanced with the increase of wind speed and sand particles’ proportion but greatly decreased with the increase of the intensity of dust release. (C) 2015 Optical Society of America