Calculation of open water evaporation is important for hydrology, industry,\nagriculture, environment, and other fields. The available methods of calculating\nevaporation are based on field or laboratory experiments and should\nnot be used for scale-up to open water evaporation for similitude relationships\ncannot be correctly obtained. The methods are thus unjustified scientifically.\nIn addition, surface evaporation is not a local phenomenon that is a\nfunction of independent meteorological parameters. These are in fact dependent\nparameters, and the solar energy exchanged with the surface of the earth\nis the only independent variable for open water evaporation. Contrary to the\nexisting methods, meteorological records and measurements are therefore\nnot required. Many parts of the world do not have full or partial records\navailable. For these, the available methods are likely not to be useful. In addition,\nfuture meteorological records or measurements cannot be made available\nfor evaporation projection in a warming world. This may well place a limit\non using the existing methods. The work presented in this manuscript reveals\na new understanding of evaporation as a climate parameter instead and can\nbe calculated as such. Minimal to no meteorological records or measurements\nmay be required. The advantages of the proposed method are scientific justification,\nsimplicity, accuracy, versatility, low to virtually no cost, and can be\nused to map present and future evaporation in a short period of time.
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