Accession Number : ADA132123

Title :   Calculation of Atmospheric Transmittance by IBM 3033 Computer Code LOWTRAN IIIB.

Descriptive Note : Master's thesis,

Corporate Author : NAVAL POSTGRADUATE SCHOOL MONTEREY CA

Personal Author(s) : Shin,Moon-Sik

PDF Url : ADA132123

Report Date : Jun 1983

Pagination or Media Count : 102

Abstract : LOWTRAN IIIB is a FORTRAN computer program for prediction of atmospheric optical transmittance, developed at the U.S. Air Force Geophysics Laboratory (AFGL). LOWTRAN IIIB was received in the modified form developed by Naval Weapons Center China Lake for use on the UNIVAC 1110 computer, and has now been interfaced to the IBM 3033 computer. Due to complier storage limitation in the IBM computer, the atmospheric data are read into common storage at the beginning of the program. The two dimensional block data submodule has been replaced with a linear data array, and a new subroutine (array) written to reformat the data. The basic logic structure is unchanged. Comparisons of NPS LOWTRAN IIIB computations with direct optical extinctions measurement over Monterey Bay and at San Nicolas Island indicate that under these circumstances LOWTRAN IIIB underestimates the extinction due to aerosols while the computed molecular absorption is in substantial agreement with experiment. LOWTRAN IIIB is presently available as a method of predicting atmospheric transmittance at low resolutions at NPS and is suitable for incorporation in simulations and studies of electro-optic weapon/sensor systems performance.

Descriptors :   *Transmittance, Ocean environments, Light transmission, Infrared transmitters, Radiation absorption, Aerosols, Extinction, Coefficients, Mathematical models, Mathematical prediction, Computer programs

Subject Categories : Meteorology
      Optics

Distribution Statement : APPROVED FOR PUBLIC RELEASE