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C. J. Stigter

Abstract

The uncertainties in average relationships between paint cloudiness and solar energy flux density can largely be accounted for through scatter in the overestimation of cloud shades by point cloudiness. This is demonstrated using monthly averaged data from Tanzanian stations. The scatter is caused by differences in cloud type and cloud distribution in different seasons and regions under conditions of equal sunshine duration and global solar radiation flux density.

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C. J. Stigter

Abstract

It is shown that a recently suggested use of a pressure dependence of the psychrometric “constant” is no improvement on existing practice. A plea is made for a through experimental and theoretical investigation into the pressure dependence of γ, given the facts that we do still rely completely on empirical values at normal pressure and that our lack of understanding of processes involved is still high.

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