Has the Priestley-Taylor Equation Any Relevance to Forest Evaporation?

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  • 1 Institute of Hydrology, Wallingford, Oxon, UK
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Abstract

Long-term evaporation measurements are expressed in the Priestley-Taylor (1972) “Potential evaporation” framework for a spruce forest in Plynlimon, Wales, and a Scots Pine forest in Norfolk, England. The results are used to illustrate the possibility of significant variability in evaporation from forest vegetation in response to precipitation input, and so provide a warning against the indiscriminate use of the Priestley-Taylor formula. A tentative suggestion is made regarding a possible role for potential evaporation in the forest environment.

Abstract

Long-term evaporation measurements are expressed in the Priestley-Taylor (1972) “Potential evaporation” framework for a spruce forest in Plynlimon, Wales, and a Scots Pine forest in Norfolk, England. The results are used to illustrate the possibility of significant variability in evaporation from forest vegetation in response to precipitation input, and so provide a warning against the indiscriminate use of the Priestley-Taylor formula. A tentative suggestion is made regarding a possible role for potential evaporation in the forest environment.

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