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Variabilidade temporal da evapotranspiração real e da razão entre evapotranspiração real e potencial em Campinas, Estado de São Paulo. (Portuguese)
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- Author(s): Blain, Gabriel Constantino; de Matos Pires, Regina Clélia
- Source:
Bragantia; 2011, Vol. 70 Issue 2, p460-470, 11p- Subject Terms:
- Source:
- Additional Information
- Alternate Title: Temporal variability of the actual evapotranspiration and the ratio between actual and potential evapotranspiration in Campinas, State of São Paulo, Brazil. (English)
- Subject Terms:
- Abstract: The aim of the work was to characterize the temporal variability of ten-day evapotranspiration series, considering the actual evapotranspiration (ETa) and the ratio between actual and potential evapotranspiration (ETa/ETP). Data between 1948 and 2008 were collected with a weather station in Campinas, State of São Paulo, Brazil. Evapotranspiration calculation considered three values of soil water availability (SWA): 50, 100, and 150 mm. Based on autocorrelation function, it was detected a significant level of temporal persistence on ETa and ETa/ETP series. The acf also has indicated that this temporal persistence tends to increase due to high SWA values. The spectral analysis has shown a decreasing power of these series after 1976. The El Niño/southern oscillation influence on ETa and ETa/ETP temporal variability was not conclusive. The Seasonal Mann-Kendall test has shown increasing trends on ETa series in the months of January, May, July, September, November and December. The ETa/ETP series was little affected by the increasing trends detected on ETP series. [ABSTRACT FROM AUTHOR]
- Abstract: O objetivo do trabalho foi caracterizar a variabilidade temporal de séries decendiais de evapotranspiração real (ETR) e da razão entre a evapotranspiração real e potencial (ETR/ETP) na localidade de Campinas, Estado de São Paulo, no período de 1948-2008, considerando três valores de capacidade de água disponível (CAD): 50, 100 e 150 mm. Utilizando a função autocorrelação (acf) verificou-se presença de significativa persistência temporal nos valores de ETR e de ETR/ETP. A aplicação da acf também permitiu inferir que essa persistência eleva-se com o aumento do valor da CAD. A análise espectral indicou queda nos picos de potência dessas duas variáveis a partir de 1976. A influência do El Nino/oscilação sul nas séries de ETR e ETR/ETP não é conclusiva. A aplicação do método Sazonal de Mann-Kendall indicou, em janeiro, maio, julho, setembro, novembro e dezembro, tendências de elevação na ETR. A ETR/ETP foi pouco sensível as elevações temporais observadas nas séries de ETP. [ABSTRACT FROM AUTHOR]
- Abstract: Copyright of Bragantia is the property of Instituto Agronomico de Campinas and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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