Abstract
Sensible and latent heat flux densities were estimated in a level vineyard, a northeast aspect vineyard and a southwest aspect vineyard in the Napa Valley of California using the eddy covariance and surface renewal methods. Surface renewal is theoretically not limited to level or extensively homogeneous terrain because it examines a more localized process of scalar exchange as compared with eddy covariance. Surface renewal estimates must be calibrated against eddy covariance data to account for unequal heating of the air parcels under a fixed measurement height. We calibrated surface renewal data against eddy covariance data in a level vineyard, and the calibration factor (α) was applied to the surface renewal measurements on the hillside vineyards. Latent heat flux density was estimated from the residual of the energy balance. In the level vineyard, the average daily actual evapotranspiration (ET a ) for the period of June through September was 2.4 mm per day. In the northeast aspect vineyard, the average daily ET a was 2.2 mm per day, while in the southwest aspect vineyard it was 2.7 mm per day. The net radiation values for the level vineyard, the northeast aspect vineyard, and the southwest aspect vineyard were compared against the Ecosystem Water Program with good agreement.
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The authors acknowledge the cooperation of Daniel Bosch and Matt Ashby of Icon Estates Wine and Al Wagner of Clos du Val Winery for providing field sites. This work would not have been possible without support from the American Vineyard Foundation under USDA Viticulture Consortium agreements 2008-34360-19365 and 2009-34360-20160 awarded to T.M. Shapland and D.R. Smart.
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Communicated by E. Fereres.
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Shapland, T.M., Snyder, R.L., Smart, D.R. et al. Estimation of actual evapotranspiration in winegrape vineyards located on hillside terrain using surface renewal analysis. Irrig Sci 30, 471–484 (2012). https://doi.org/10.1007/s00271-012-0377-6
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DOI: https://doi.org/10.1007/s00271-012-0377-6