A method for the estimation of potential evapotranspiration and/or open pan evaporation over Brazil.

• Autor(a) principal: REDDY, S. J.
• Data de Publicação: 1984
• Outros Autores: AMORIM NETO, M. D. S.
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Institucional da EMBRAPA (Repository Open Access to Scientific Information from EMBRAPA - Alice)
• Texto Completo: http://www.alice.cnptia.embrapa.br/alice/handle/doc/126867
• topic: Recursos naturais; Evapotranspiracao potencial; Precipitacao pluviometrica; Coordenada geografica; Clima; Evaporação; Climatic zones

This paper presents a simple regression model to estimate potential evapotranspfration and/or open pan evaporation data for a wide networlc of stations in Brazil. The model uses the readily available data sets like geocoordinates (latitude) and precipitation as inputs. Potential evapotranspira- tion presents a high correlation with the precipitation during summer months and with latitude during winter months. It also shows association with longitude and elevation; the magnitude of variation appears to be very smafl. This model gave aR 2 varying froin 0.460 to 0.902 for different months. The model is also extended to weekly periods of individual yeaxs and tested with the open pan evaporation data of Bebedouro and Mandacaru. The agreement between observed and predicted values appears to be good.