Latent heat flux over Cabernet Sauvignon vineyard using the Shuttleworth and Wallace model |
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| Authors: | S Ortega-Farias M Carrasco A Olioso C Acevedo C Poblete |
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| Institution: | (1) Centro de Investigaciòn y Transferencia en Riego y Agroclimatología (CITRA), Facultad de Ciencias Agrarias, Universidad de Talca, Casilla 747, Talca, Chile;(2) Institut National de la Recherche Agronomique (INRA), Unité Climat, Sol et Environnement, Domaine St. Paul, Site Agroparc, 84914 Avignon Cedex 9, France |
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| Abstract: | The Shuttleworth and Wallace model (SW) was evaluated to estimate latent heat flux above a drip-irrigated Cabernet Sauvignon
vineyard, located in the Pencahue Valley, Region del Maule, Chile (35°22′ LS; 71°47′ LW; 150 m above sea level). The performance
of the WS model (LEws) was evaluated against the eddy-covariance method (LEed) on a 30 min time interval. Results indicate that the root mean square error (RMSE) and mean absolute error (MAE) were 29 W m−2 and 22 W m−2, respectively. For the vine evapotranspiration (ETv), RMSE was 0.42 mm day−1 and MAE was 0.36 mm day−1. The largest disagreements between LEed and LEws were observed under dry atmospheric conditions. Also, the sensitivity analysis indicates that predicted ETv by the SW model
was sensitive to errors of ±30% in leaf area index and mean stomatal resistance, but it was not affected by errors in the
estimation of aerodynamic resistances. |
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