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Divergence of Actual and Reference Evapotranspiration Observations for Irrigated Sugarcane with Windy Tropical Conditions : Volume 19, Issue 1 (29/01/2015)

By Anderson, R. G.

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Book Id: WPLBN0003987176
Format Type: PDF Article :
File Size: Pages 17
Reproduction Date: 2015

Title: Divergence of Actual and Reference Evapotranspiration Observations for Irrigated Sugarcane with Windy Tropical Conditions : Volume 19, Issue 1 (29/01/2015)  
Author: Anderson, R. G.
Volume: Vol. 19, Issue 1
Language: English
Subject: Science, Hydrology, Earth
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Copernicus GmbH
Publication Date:
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications


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Zhang, H., Ayars, J. E., Wang, D., Anderson, R. G., & Tirado-Corbalá, R. (2015). Divergence of Actual and Reference Evapotranspiration Observations for Irrigated Sugarcane with Windy Tropical Conditions : Volume 19, Issue 1 (29/01/2015). Retrieved from

Description: USDA, Agricultural Research Service, San Joaquin Valley Agricultural Sciences Center, Water Management Research Unit, Parlier, California, USA. Standardized reference evapotranspiration (ET) and ecosystem-specific vegetation coefficients are frequently used to estimate actual ET. However, equations for calculating reference ET have not been well validated in tropical environments. We measured ET (ETEC) using eddy covariance (EC) towers at two irrigated sugarcane fields on the leeward (dry) side of Maui, Hawaii, USA in contrasting climates. We calculated reference ET at the fields using the short (ET0) and tall (ETr) vegetation versions of the American Society for Civil Engineers (ASCE) equation. The ASCE equations were compared to the Priestley–Taylor ET (ETPT) and ETEC. Reference ET from the ASCE approaches exceeded ETEC during the mid-period (when vegetation coefficients suggest ETEC should exceed reference ET). At the windier tower site, cumulative ETr exceeded ETEC by 854 mm over the course of the mid-period (267 days). At the less windy site, mid-period ETr still exceeded ETEC, but the difference was smaller (443 mm). At both sites, ETPT approximated mid-period ETEC more closely than the ASCE equations ((ETPT-ETEC) < 170 mm). Analysis of applied water and precipitation, soil moisture, leaf stomatal resistance, and canopy cover suggest that the lower observed ETEC was not the result of water stress or reduced vegetation cover. Use of a custom-calibrated bulk canopy resistance improved the reference ET estimate and reduced seasonal ET discrepancy relative to ETPT and ETEC in the less windy field and had mixed performance in the windier field. These divergences suggest that modifications to reference ET equations may be warranted in some tropical regions.

Divergence of actual and reference evapotranspiration observations for irrigated sugarcane with windy tropical conditions

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