Accession Number : AD0722714

Title :   Computer Procedure for Calculating Time Dependent Light Scattering in Plane Parallel Atmospheres.

Descriptive Note : Final rept. 1 Jul 68-31 Jan 71,

Corporate Author : RADIATION RESEARCH ASSOCIATES INC FORT WORTH TEX

Personal Author(s) : Collins,Dave G. ; Wells,Michael B.

Report Date : APR 1971

Pagination or Media Count : 70

Abstract : The report describes two Monte Carlo procedures that were developed for the purpose of providing calculational tools that could be used to study the transport of visible and infrared light in plane-parallel atmospheres. These procedures, designated as TPART-I and TPART-II, treat atmospheric scattering problems for point and plane parallel monochromatic sources, respectively. The TPART procedures consider the effect of Rayleigh and aerosol scattering and ozone, water vapor, CO2, and aerosol particle absorption on the transport of light. The procedures also consider the changes in polarization that occurs at each scattering event. The input format of the codes allows one to describe the scattering and absorption properties of the atmosphere as a function of altitude. Provisions are incorporated for treating the ground surface with an albedo method. The output of the TPART procedures gives the scattered light intensity at each receiver position as a function of a polar and azimuthal angle and time. The procedures were written in FORTRAN-IV language for both the CDC-6600 and IBM Direct Couple Systems. The codes have been verified through comparisons with results of other calculations of light transport in the atmosphere. (Author)

Descriptors :   (*ATMOSPHERES, *LIGHT TRANSMISSION), SCATTERING, MONTE CARLO METHOD, ABSORPTION, MONOCHROMATIC LIGHT, INFRARED RADIATION, POLARIZATION, REFLECTION, INTENSITY, ALBEDO, COMPUTER PROGRAMMING

Subject Categories : Atmospheric Physics
      Computer Programming and Software
      Optics

Distribution Statement : APPROVED FOR PUBLIC RELEASE