Data/hora: 20/06/2024 09:50:30

Biblioteca(s): | Embrapa Florestas.
Data corrente: | 30/09/2003
Data da última atualização: | 30/09/2003
Autoria: | PEREIRA, A. R.; SENTELHAS, P. C.; FOLEGATTI, M. V.; NOVA, N. A. V.; MAGGIOTTO, S. R.; PEREIRA, F. A. de C.
Título: | Substantiation of the daily FAO-56 reference evapotranspiration with data from automatic and conventional weather stations.
Ano de publicação: | 2002
Fonte/Imprenta: | Revista Brasileira de Agrometeorologia, Santa Maria, v. 10, n. 2, p. 251-257, jul./dez. 2002.
Idioma: | Inglês
Conteúdo: | Daily grass reference evapotranspiration (ETo) computed following the FAO-56 guidelines and parameterization of the Penman-Monteith big leaf model (P-M) were compared with lysimetric evapotranspiration (ET) measurements in an irrigated grass field. ETo was computed using two independent weather data sets. One, from an automatic weather station (AWS), located at the lysimeter site, with a complete set of data as required by the P-M model. Another, from a regional conventional weather station (CWS), about 2 km away from the lysimeter, and lacking measurements of net radiation and wind speed at 2 m above the ground, being both estimated empirically. Results with data from both weather stations substantiates the FAO-56 scheme and the proposal that the big leaf P-M model should be preferred even when some of the required weather data are missing and have to be estimated empirically. On the average, the CWS incomplete data set resulted in better estimates of ETo than the complete data from the AWS. The decoupling factor ? was, on average, close to 0.8 indicating that grass ET was indeed strongly dependent on the net radiation as suggested elsewhere.
Palavras-Chave: | Big leaf model; Decoupling factor; Evapotranspiração de referência; Fator de desacoplamento; Grass reference evapotranspiration; Modelo "big leaf"; Penman-Monteith.
Categoria do assunto: | --
Registro original: | Embrapa Florestas (CNPF)
Exemplares: | CNPF - (32393-1) - ADD - AP - -- -  -  -  - DIS