Change in the Transmissivity Parameter with Atmospheric Path Length

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  • 1 Department of Geography, UCLA, Los Angeles 90024
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Abstract

Calculations and measurements show that the transmissivity parameter t is an increasing function of the optical air mass m. An equation for estimating t for several model atmospheres is presented, and the direct beam flux calculated with the estimates is compared with that obtained using a constant value of t. The equation gives significantly better results for hourly or instantaneous values, and for daily totals on some surfaces.

Abstract

Calculations and measurements show that the transmissivity parameter t is an increasing function of the optical air mass m. An equation for estimating t for several model atmospheres is presented, and the direct beam flux calculated with the estimates is compared with that obtained using a constant value of t. The equation gives significantly better results for hourly or instantaneous values, and for daily totals on some surfaces.

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