Evaporation pan isotopic behavior as an index of isotopic evaporation conditions |
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| Authors: | JA Welhan P Fritz |
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| Institution: | Department of Earth Sciences, University of Waterloo, Waterloo, Ontario, Canada |
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| Abstract: | The stable isotope content of moisture (δE) removed by evaporation from a well mixed water body with no inflow is related to the isotopic content of the liquid (δ) by the equation m = (δE ? δ)/(δ ? δs). where δs is the isotopic 'steady state' of the liquid for given evaporation conditions, achieved as the liquid volume goes to zero, and m is a measure of the rate of approach of δ to δs. The parameters δs and m can be determined from simple isotopic and volume measurements of liquid water in an evaporation pan. If the mean daily surface water temperatures of such a pan and a nearby lake are equal, then with certain assumptions the pan-derived values of δs and m can be used to calculate δE for the lake surface from a knowledge of the isotopic content of the surface water. The method may be most useful in areas of low rainfall where evaporation pan observations can be conducted over long periods of time without interruption. |
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