An Algorithm for the Vertical Structure of Aerosol Extinction in the Lowest Kilometer of the Atmosphere: Rev. 1

Report No. ARL-SR-0385
Authors: Melvin G Heaps and Robert D Johnson
Date/Pages: November 2017; 28 pages
Abstract: This is a revision of the original 1983 technical report by Melvin G Heaps and Robert D Johnson (ASL-TR-0142). This report has been reprinted to allow wider distribution than the original limited distribution report and to allow users of the Air Force's LOWTRAN and MODTRAN models more complete documentation of the Army Vertical Structure Algorithm (VSA) used in those models.

A previously developed algorithm describes the vertical structure of visibility for low visibility/low stratus conditions. The mathematical formalism of this earlier algorithm has been retained, and based upon additional data and reasonable physical assumptions, extended to more general cases. Tabular values and guidelines are now provided that allow estimations of the vertical structure of visibility within the planetary boundary layer (nominally up to 1 km in altitude) for low to high surface visibilities and under conditions ranging from low cloud ceilings to clear skies.
Distribution: Approved for public release
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Last Update / Reviewed: November 1, 2017