Evaluation of three evaporation estimation methods in a Canadian prairie landscape

Armstrong, Robert N., Pomeroy, John W. and Martz, Lawrence W. (2008) Evaluation of three evaporation estimation methods in a Canadian prairie landscape. Hydrological Processes, 22 15: 2801-2815. doi:10.1002/hyp.7054

Author Armstrong, Robert N.
Pomeroy, John W.
Martz, Lawrence W.
Title Evaluation of three evaporation estimation methods in a Canadian prairie landscape
Journal name Hydrological Processes   Check publisher's open access policy
ISSN 1099-1085
Publication date 2008-05-08
Sub-type Article (original research)
DOI 10.1002/hyp.7054
Open Access Status Not Open Access
Volume 22
Issue 15
Start page 2801
End page 2815
Total pages 15
Place of publication Chichester, West Sussex, United Kingdom
Publisher John Wiley & Sons
Abstract Three approaches to estimating actual evaporation (evaporation from water, soil, and transpiration from plants) are evaluated against eddy covariance observations taken during the summer period of 2006 over an upland mixed-grass site in the St Denis National Wildlife Area, central Saskatchewan. The Penman-Monteith (P-M) combination approach explicitly takes into consideration the influence of surface resistance and available energy in order to calculate evaporation from non-saturated surfaces. The Granger and Gray (G-D) expression is an extension of the Penman equation to the case of non-saturated surfaces using a complimentary approach that considers the relative evaporation G, or the ratio of actual to potential evaporation as an inverse function of the relative drying power of the air, D. D is a function of the humidity deficit and available energy. The Dalton-type bulk transfer (BT) approach typically applied in land surface schemes considers turbulent transfer along the humidity gradient between the surface and atmosphere as diagnosed from the land surface temperature. In this case, surface temperature was observed radiometrically rather than modelled. The models were evaluated for several temporal scales from 15 min to seasonal, and compared with measured evaporation data obtained by an eddy covariance system. Results suggest that all three approaches have 'reasonable' applicability for estimating evaporation at point-scales for periods longer than daily, but none of the methods provide consistently reliable daily or sub-daily estimates of evaporation.
Keyword Evaporation
Eddy covariance
Surface temperature
Land surface scheme
Prairie hydrology
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: Queensland Alliance for Agriculture and Food Innovation
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Citation counts: TR Web of Science Citation Count  Cited 18 times in Thomson Reuters Web of Science Article | Citations
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Created: Thu, 09 Jun 2016, 21:20:13 EST by Robert Armstrong on behalf of Centre for Plant Science