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Alternate Corrections for Estimating Actual Wetland Evapotranspiration from Potential Evapotranspiration

W. Barclay Shoemaker1 and David M. Sumner2
1U.S. Geological Survey
3110 SW 9th Avenue
Fort Lauderdale, Florida, USA 33315
Phone 954-377-5956
E-mail: bshoemak@usgs.gov

2U.S. Geological Survey
224 West Central Parkway, Suite 1006
Altamonte Springs, Florida, USA 32714

WETLANDS, Vol. 26, No. 2, June 2006, pp. 528-543. © 2006, The Society of Wetland Scientists. DOI: 10.1672/0277-5212(2006)26[528:ACFEAW]2.0.CO;2. Posted here with permission from Springer. PDF of entire article is available from BioOne Online Journals. [journal subscription required]


Literature Cited
Equations, Figures & Tables
Corrections can be used to estimate actual wetland evapotranspiration (AET) from potential evapotranspiration (PET) as a means to define the hydrology of wetland areas. Many alternate parameterizations for correction coefficients for three PET equations are presented, covering a wide range of possible data-availability scenarios. At nine sites in the wetland Everglades of south Florida, USA, the relatively complex PET Penman equation was corrected to daily total AET with smaller standard errors than the PET simple and Priestley-Taylor equations. The simpler equations, however, required less data (and thus less funding for instrumentation), with the possibility of being corrected to AET with slightly larger, comparable, or even smaller standard errors. Air temperature generally corrected PET simple most effectively to wetland AET, while wetland stage and humidity generally corrected PET Priestley-Taylor and Penman most effectively to wetland AET. Stage was identified for PET Priestley-Taylor and Penman as the data type with the most correction ability at sites that are dry part of each year or dry part of some years. Finally, although surface water generally was readily available at each monitoring site, AET was not occurring at potential rates, as conceptually expected under well-watered conditions. Apparently, factors other than water availability, such as atmospheric and stomata resistances to vapor transport, also were limiting the PET rate.

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Related information:

SOFIA Project: Greenhouse Gas Fluxes for Restored and Degraded Greater Everglades Wetlands: Eddy-Covariance Flux Tower Measurements

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