Accession Number:

ADA222094

Title:

A LOWTRAN7 Sensitivity Study in the 8-12 and 3-5 Micron Bands - Includes Comparison with LOWTRAN6 Results

Descriptive Note:

Technical note,

Corporate Author:

AIR FORCE ENVIRONMENTAL TECHNICAL APPLICATIONS CENTER SCOTT AFB IL

Personal Author(s):

Report Date:

1990-02-01

Pagination or Media Count:

22.0

Abstract:

More than 750 runs of LOWTRAN7 were made to determine how variations in certain weather variables absolute humidity, relative humidity, wind speed, meteorological range, and precipitation affect computed atmospheric transmittance in the 8-12 and 3-5 micron bands. This was done by changing the value of each of these weather variables, in turn, and observing the resulting change in transmittance calculations. About 30 LOWTRAN6 runs were made for comparison with the LOWTRAN7 output. Results for the 8-12 micron band showed that absolute humidity and precipitation produce the greatest decreases in transmittance. When the desert aerosol is used in LOWTRAN7, high wind speeds can produce low transmittances due to heavy dust loading. Meteorological range only becomes a strong factor in lowering transmittances when it drops below 2 km. Relative humidity is important when using the maritime aerosol, especially when it exceeds 70. RRH

Subject Categories:

  • Meteorology

Distribution Statement:

APPROVED FOR PUBLIC RELEASE