Registro Completo |
Biblioteca(s): |
Embrapa Soja. |
Data corrente: |
08/07/1992 |
Data da última atualização: |
08/07/1992 |
Autoria: |
BLAD, B. L.; ROSENBERG, N. J. |
Título: |
Lysimetric calibration of the Bowen Ratio-Energy balance method for evapotranspiration estimation in the central Great Plains. |
Ano de publicação: |
1974 |
Fonte/Imprenta: |
Journal of Applied Meteorology, v.13, n.2, p.227-236, 1974. |
Idioma: |
Inglês |
Conteúdo: |
Most reports show good agreement between evapotranspiration (ET) rates estimated by the Bowen Ratio-Energy Balance (BREB) method and rates measured with lysimeters, although underestimation by the BREB model has occasionally been reported. This study was conducted to evaluate the performance of the BREB technique in the climatic conditions characteristic of the central Great Plains, a region where a significant proportion of the energy consumed by evapotranspiration is supplied from advected sensible heat. Agreement between the BREB method and lysimetric measurements of ET is good during non-advective periods but during advective periods the BREB model underestimates ET by about 20%. Data collected in this study suggest that the difference is due primarily to an inequality of the exchange coefficients for heat (Kh) and water vapor (Kw). In the development of the BREB method these coefficients are assumed to be identical but our results indicate that the ratio Kh/Kw is greater than 1 for the stable conditions associated with the downward transport of sensible heat. |
Thesagro: |
Evapotranspiração; Meteorologia. |
Thesaurus Nal: |
evapotranspiration; meteorology. |
Categoria do assunto: |
-- |
Marc: |
LEADER 01648naa a2200181 a 4500 001 1457411 005 1992-07-08 008 1974 bl --- 0-- u #d 100 1 $aBLAD, B. L. 245 $aLysimetric calibration of the Bowen Ratio-Energy balance method for evapotranspiration estimation in the central Great Plains. 260 $c1974 520 $aMost reports show good agreement between evapotranspiration (ET) rates estimated by the Bowen Ratio-Energy Balance (BREB) method and rates measured with lysimeters, although underestimation by the BREB model has occasionally been reported. This study was conducted to evaluate the performance of the BREB technique in the climatic conditions characteristic of the central Great Plains, a region where a significant proportion of the energy consumed by evapotranspiration is supplied from advected sensible heat. Agreement between the BREB method and lysimetric measurements of ET is good during non-advective periods but during advective periods the BREB model underestimates ET by about 20%. Data collected in this study suggest that the difference is due primarily to an inequality of the exchange coefficients for heat (Kh) and water vapor (Kw). In the development of the BREB method these coefficients are assumed to be identical but our results indicate that the ratio Kh/Kw is greater than 1 for the stable conditions associated with the downward transport of sensible heat. 650 $aevapotranspiration 650 $ameteorology 650 $aEvapotranspiração 650 $aMeteorologia 700 1 $aROSENBERG, N. J. 773 $tJournal of Applied Meteorology$gv.13, n.2, p.227-236, 1974.
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Embrapa Soja (CNPSO) |