Comparison of the EMI long sea path transmittance measurements with LOWTRAN 5 calculations /
William O. Gallery.

Description

Main Author

Gallery, William O.

Related Names

United States. Air Force.
U.S. Air Force Geophysics Laboratory

Language(s)

English

Published

Hanscom AFB, Massachusetts : Air Force Geophysics Laboratory, Air Force Systems Command, United States Air Force, 1980.

Subjects

Atmospheric models.
Infrared radiation.
Radiative transfer.
Aerosols > Aerosols / Mathematical models.
Light > Light / Transmission.

Summary

A series of broadband visible and infrared transmittance measurements made by EMI Ltd. over a 20 km sea path are compared to transmittances calculated by LOWTRAN 5. The purpose of the comparison is primarily to test the validity of the Maritime aerosol model in LOWTRAN under realistic conditions, and incidentally to test the molecular extinction in several window regions. The results of this comparison are the following: (a) the Maritime aerosol model provides a good description of aerosol extinction for conditions of a moderate wind blowing over the open ocean; (b) the calculated molecular extinction in the 8 to 12 micron region is accurate to within 7 percent in the log of the transmittance, although there is an indication the water vapor continuum absorption coefficient may be slightly too large; (c) the calculated molecular extinction in the 4.5 to 5.0 micron region is seriously underpredicted due to the lack of a water vapor continuum in this region.

Note

"Optical Physics Division Project 7670."
"ADA092593 (From http://www.dtic.mil)."
"28 May 1980."

Physical Description

40 pages : illustrations, figures, tables ; 28 cm.

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