WORLDWIDE EVAPORATION MAPS,
FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO
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World maps are given showing evaporation for the year and for each separate month. The method used for calculating the evaporation was developed at the Main Geophysical Observatory. The calculations were made for 1460 points located on all continents except Antarctica and mountainous regions. These maps show that the evaporation is zonally distributed outside the tropical latitudes. Deviations from this zonal distribution are observed close to shore lines where cyclonic and monsoon circulation develops due to a reduction in radiation balance for these territories. The distribution of evaporation in the tropical latitudes depends mainly on the distribution of the radiation balance. A maximum evaporation of more than 250 cm per year is observed in the Sahara Desert. Curves are given showing the annual behavior of evaporation for various sections of the earth. The extratropical latitudes show a single maximum in evaporation during the summer. Two maxima are observed in the equatorial latitudes, one in the spring and one in the fall.