Vol. 25, issue 02, article # 11

Abstract:

The results of theoretical analysis of photophoretic motion of soot particles in the shortwave solar radiation field for stationary atmosphere are presented. In the updated radiating block of the model the integrated fluxes of solar radiation were calculated by the Monte Carlo method with approximation of a plane-parallel, horizontal-homogeneous molecular-aerosol atmosphere. The analysis of the received results confirms again an opportunity the essential photophoretic effects for soot aerosol particles in stratosphere: the "sun" photophoresis can be considered as the effective mechanism of vertical transport of well-absorbing sub-micrometer particles up to heights of the middle stratosphere. The forces of "sun" photophoresis can compete to gravities up to heights 30-35 km for particles of sub-micrometer and micrometer sizes. On other hand, the estimations have shown again the small efficiency of radiometric photophoresis for weakly-absorbing, dense and high-conducting particles of atmospheric aerosol.

Keywords:

aerosol, photophoresis, solar radiation, soot particles