COMBIC Modifications to Determine Aerosol Cloud Densities for Multiple Obscurant Input Sources

摘要

Modifications were made to the Combined Obscuration Model for Battlefield Induced Contaminants (COMBIC) code to obtain aerosol cloud-density values for multiple obscurant types. The main purpose of COMBIC has traditionally been to obtain the transmittance or optical depth for one or more lines of sight (LOS). If one specifies optical depth uses consistent units, and ensures that the product of mass extinction coefficient and optical path length is unity, output values will be numerically equal to the cloud density (g/m3). This report provides information on the required input values, the modifications made to COMBIC, and the resulting output obtained when one or more sources comprising various obscurant types are provided as input. Examples are included that show various cases containing sources with one or more obscurant types as input. The density output files and the resulting visualized clouds are also given in this report. Specific recommendations for the appropriate input values required to produce valid cloud-density grids are indicated.