Abstract
We compared evaporation measurements from a floating pan, land pan, chamber, and the Priestley-Taylor (PT) equation. Floating pan, land pan, and meteorological data were collected from June 6 to July 21, 2005, at a small wetland in the Canadian River alluvium in central Oklahoma, USA. Evaporation measured with the floating pan compared favorably to 12 h chamber measurements. Differences between chamber and floating pan rates ranged from −0.2 to 0.3 mm, mean of 0.1 mm. The difference between chamber and land pan rates ranged from 0.8 to 2.0 mm, mean of 1.5 mm. The mean chamber-to-floating pan ratio was 0.97 and the mean chamber-to-land pan ratio was 0.73. The chamber-to-floating pan ratio of 0.97 indicates the use of a floating pan to measure evaporation in small limited-fetch water bodies is an appropriate and accurate method for the site investigated. One-sided Paired t-Tests indicate daily floating pan rates were significantly less than land pan and PT rates. A two-sided Paired t-Test indicated there was no significant difference between land pan and PT values. The PT equation tends to overestimate evaporation during times when the air is of low drying power and tends to underestimate as drying power increases.
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Acknowledgments
We thank Bill Andrews, Glen Harwell, and Stan Paxton for reviewing and providing insightful comments that greatly improved the manuscript, Jerrod Smith, James Greer, Nichole Kohmescher, and Abby Tomasek for helping with deployment of the evaporation chamber, and Hanna Masoner and Jasey Masoner for helping with weather-station maintenance. Any use of trade, products, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government.
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Masoner, J.R., Stannard, D.I. A Comparison of Methods for Estimating Open-Water Evaporation in Small Wetlands. Wetlands 30, 513–524 (2010). https://doi.org/10.1007/s13157-010-0041-y
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DOI: https://doi.org/10.1007/s13157-010-0041-y