Abstract
The Makkink equation can be used to calculate evaporation using air temperature and the fraction of sunshine duration data. The equation has two coefficients depending on locality. The coefficients at 157 meteorological stations in Japan are determined by the use of monthly data for 6 years of pan evaporation, air temperature, and the fraction of sunshine duration. On the basis of the results obtained, maps of each coefficient for the whole of Japan are prepared. Rough estimates of the two coefficients at any place may be found from the two maps. It is also indicated that the Makkink equation using average values of the two coefficients can be used to estimate pan evaporation as well as the Penman equation. Moreover, in order to extend the Makkink equation, an approach incorporating the effect of albedo into the equation is suggested.
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