Atmospheric Transmittance and Radiance: Methods of Calculation
IRIA State-of-the-Art rept.
ENVIRONMENTAL RESEARCH INST OF MICHIGANANN ARBOR INFRARED AND OPTICS DIV
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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.
- Atmospheric Physics