Accession Number:

ADA017459

Title:

Atmospheric Transmittance and Radiance: Methods of Calculation

Descriptive Note:

IRIA State-of-the-Art rept.

Corporate Author:

ENVIRONMENTAL RESEARCH INST OF MICHIGANANN ARBOR INFRARED AND OPTICS DIV

Personal Author(s):

• LaRocca, Anthony J.
• Turner, Robert E.

Report Date:

1975-06-01

Pagination or Media Count:

508.0

Abstract:

The report is broadly divided into the categories of scattering and absorption, with the greater stress laid on absorption. The first of these is the so-called line-by-line direct integration method, which requires a detailed compilation of the characteristics of individual molecular lines. The second of the absorption methods of calculation presented is the band-model technique. In this method, the line spectrum is approximated by some mathematically manipulatable distribution function with undetermined band-model parameters. By comparison of calculated results with laboratory experimental data the parameters are defined, and the band-model is used for calculating transmittance under any required meteorological conditions. The third general set of techniques is given the heading Multi-Parameter Analytical Procedures. These techniques are derived from the band-model concept, incorporating a larger number of parameters, with presumably greater accuracy in the resultant calculations. The rest of the report is either tutorial or supportive, presenting details of information which is required as input to the calculation procedures.

Descriptors:

• *COMPUTATIONS
• *RADIATIVE TRANSFER
• *LIGHT TRANSMISSION
• COMPUTER PROGRAMS
• MATHEMATICAL MODELS
• LIGHT SCATTERING
• AEROSOLS
• PARTICLES
• MATHEMATICAL ANALYSIS
• CARBON MONOXIDE
• METHANE
• CARBON DIOXIDE
• INTEGRAL EQUATIONS
• OZONE
• WATER VAPOR
• ATMOSPHERIC CHEMISTRY

Subject Categories:

• Atmospheric Physics
• Optics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE