Análise de tendência e caracterização sazonal e interanual da evapotranspiração de referência para o sudoeste da amazônia brasileira: Acre, Brasil
The objective of this research was to investigate monthly climatological, seasonal, annual and interdecadal of the reference evapotranspiration (ETo) in Acre state in order to better understand its spatial and temporal variability and identify possible trends in the region. The study was conducte...
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| Formato: | Dissertação |
| Idioma: | por |
| Publicado em: |
Universidade Federal do Rio Grande do Norte
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| Endereço do item: | https://repositorio.ufrn.br/jspui/handle/123456789/20189 |
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| Resumo: | The objective of this research was to investigate monthly climatological, seasonal, annual and
interdecadal of the reference evapotranspiration (ETo) in Acre state in order to better understand
its spatial and temporal variability and identify possible trends in the region. The study was
conducted with data from Rio Branco municipalities, the state capital, Tarauacá and Cruzeiro do
Sul considering a 30-year period (1985-2014), from monthly data from weather stations surface of
the National Institute of Meteorology. The methodology was held, first, the consistency of
meteorological data. Thus, it was made the gap filling in the time series by means of multivariate
techniques. Subsequently were performed statistical tests trend (Mann-Kendall) and homogeneity,
by Sen's estimator of the magnitude of this trend is estimated, as well as computational algorithms
containing parametric and non-parametric tests for two samples to identify from that year the trend
has become significant. Finally, analysis of variance technique (ANOVA) was adopted in order to
verify whether there were significant differences in average annual evapotranspiration between
locations. The indirect method of Penman-Montheith parameterized by FAO was used to calculate
the ETo. The results of this work through examination of the descriptive statistics showed that the
ETo the annual average was 3.80, 2.92 and 2.86 mm day-1 year, to Rio Branco, Tarauacá and
Cruzeiro do Sul, respectively. Featuring quite remarkable seasonal pattern with a minimum in June
and a maximum in October, with Rio Branco to town one with the strongest signal (amplitudes) on
the other hand, the Southern Cross presented the highest variability among the studied locations.
By ANOVA it was found that the average annual statistically different for a significance level of 1%
between locations, but the annual average between Cruzeiro do Sul and Tarauacá no statistically
significant differences. For the three locations, the 2000s was the one with the highest ETo values
associated with warmer waters of the North Atlantic basin and the 80s to lower values, associated
with cooler waters of this basin. By analyzing the Mann-kendall and Sen estimator test, there was a
trend of increasing the seasonal reference evapotranspiration (fall, winter and spring) on the order
of 0.11 mm per decade and that from the years of 1990, 1996 and 2001 became statistically
significant to the localities of Cruzeiro do Sul Tarauacá and Rio Branco, respectively. For trend
analysis of meteorological parameters was observed positive trend in the 5% level of significance,
for average temperature, minimum temperature and solar radiation. |
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