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The energy balance of an evaporation pan and the measurement of the reflectivity of its bottom
Author(s) -
Wartena L.,
Borghorst A. J. W.
Publication year - 1961
Publication title -
quarterly journal of the royal meteorological society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.744
H-Index - 143
eISSN - 1477-870X
pISSN - 0035-9009
DOI - 10.1002/qj.49708737212
Subject(s) - albedo (alchemy) , environmental science , energy balance , evaporation , water balance , reflectivity , sunlight , solar energy , meteorology , atmospheric sciences , hydrology (agriculture) , geology , geography , optics , art , ecology , physics , geotechnical engineering , performance art , biology , art history
A U.S. Weather Bureau Class A evaporation pan was used for micro‐meteorological measurements in Iraq. Because it seemed doubtful if the method of the U.S. Weather Bureau could be used for working up the data in the desert climate of Iraq, the energy balance of the pan was studied, and details are published elsewhere. The considered items are summed up in this contribution and the results are given in Table 1. The problem of the albedo for sunlight of the shallow water in the pan was studied in the laboratory. Measurements were taken with a filtered lightbeam and a silicon photo‐cell. In a zinc pan filled with 0·175 m water, 8 per cent of the direct and diffuse sunlight with wavelengths < 1 μ which has penetrated through the water surface is reflected.