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A simple model for estimating the Bowen ratio from climatic factors for determining latent and sensible heat flux

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dc.creator Pérez, P. J.
dc.creator Castellví, F.
dc.creator Martínez-Cob, Antonio
dc.date 2008-05-15T12:48:51Z
dc.date 2008-05-15T12:48:51Z
dc.date 2008-01
dc.date.accessioned 2017-01-31T01:20:13Z
dc.date.available 2017-01-31T01:20:13Z
dc.identifier Agricultural and Forest Meteorology 148 (1): 25-37 (2008)
dc.identifier 0168-1923
dc.identifier http://hdl.handle.net/10261/4289
dc.identifier 10.1016/j.agrformet.2007.08.015
dc.identifier.uri http://dspace.mediu.edu.my:8181/xmlui/handle/10261/4289
dc.description The final version is available at: http://www.sciencedirect.com/science/journal/01681923
dc.description The energy partitioning or Bowen ratio β at the surface, can be expressed as a function of a climatic factor C (which depends on the climatic characteristics through the climatological resistance ri) and of a surface factor S (which depends on the surface characteristics through the surface resistance rc). This paper explains an approach for estimating S and therefore β as a function of standard meteorological variables. The empirical approach is then validated by estimating the latent (λE) and sensible (H) heat flux. The experimental data were measured over grass at two semiarid locations in the Ebro river valley, NE Spain, with typical Mediterranean climates: at Mas Bove, using a Bowen ratio-energy balance method from 1991 to 1993, and at Zaragoza, using a weighing lysimeter from 1999 to 2000. Results show that the surface factor S depends on the square root of the absolute value of ri/ra (where ra is the aerodynamic resistance), with two locally calibrated empirical parameters. This result is valid for the largest possible range of situations (β values) throughout the day. Using three different hypotheses for computing ra, results for β (following Hypothesis 1) indicate a good level of performance by the model, although with a high degree of variability. The estimated latent heat flux λEest,1 tends to slightly underestimate the measured values. Under the semiarid conditions of the region, λEPM estimates obtained with the Penman–Monteith equation produce relative errors that are greater than those obtained with the proposed model once it has been calibrated. On average, sensible heat flux tends to be overestimated with the proposed method.
dc.description This work was funded by the Spanish Ministry of Science and Technology under projects ENE2004-07619/ALT and REN2001-1630/CLI and, and by the Department of Universities and Research (Generalitat de Catalunya) under project 2001SGR-00306.
dc.description Peer reviewed
dc.format 377748 bytes
dc.format application/pdf
dc.language eng
dc.publisher Elsevier
dc.relation http://dx.doi.org/10.1016/j.agrformet.2007.08.015
dc.rights openAccess
dc.subject Bowen ratio
dc.subject Energy partitioning
dc.subject Surface resistance
dc.subject Evapotranspiration
dc.subject Evapotranspiration
dc.subject Penman–Monteith equation
dc.title A simple model for estimating the Bowen ratio from climatic factors for determining latent and sensible heat flux
dc.type Artículo


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