Abstract
Measurements of incoming and reflected global radiation at Azraq in the Jordan desert during April and May 1966 permitted the calculation of coefficients of atmospheric transmission and ground surface reflection. The transmission coefficient varied between 0.706 and 0.777 and showed an afternoon maximum. A slightly higher value (0.808) was obtained from the regression of daily amounts of global radiation against the daily duration of sunshine. The regression gave estimates of solar radiation that were similar to values taken fromBudyko's heat balance atlas. Average reflection coefficients for green vegetation were in good agreement with the value of 0.25 suggested byMonteith. Most surfaces, except for basalt, showed a marked dependence of reflection upon solar elevation. Absorbed global radiation was calculated for different surfaces in the area and estimates of the net radiation and potential evapotranspiration were made.
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