divergence of actual and reference evapotranspiration observations for irrigated sugarcane with windy tropical conditions
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ID: 217088
2015
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Abstract
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.
| Reference Key |
anderson2015hydrologydivergence
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|---|---|
| Authors | ;R. G. Anderson;D. Wang;R. Tirado-Corbalá;H. Zhang;J. E. Ayars |
| Journal | materials research bulletin |
| Year | 2015 |
| DOI |
10.5194/hess-19-583-2015
|
| URL | |
| Keywords |
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