Detecting linear trend of reference evapotranspiration in irrigated farming areas in Brazil’s semiarid region

Júnior, Jório Bezerra Cabral; Silva, Cláudio Moisés Santos e; Almeida, Hermes Alves de; Bezerra, Bergson Guedes; Spyrides, Maria Helena Constantino

doi:10.1007/s00704-019-02816-w

Cited by 32 publications

(21 citation statements)

References 35 publications

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“…Furthermore, the SFB has enormous economic, social and cultural importance to the country. Its water is used for human and animal supply, irrigation and energy production for a large part of the surrounding population, living in about 505 municipalities [36,37] with a population of 18,218,575 [38]. In addition, the river serves for transport between cities.…”

Section: Study Areamentioning

confidence: 99%

Evaluation of the Integrated Multi-SatellitE Retrievals for the Global Precipitation Measurement (IMERG) Product in the São Francisco Basin (Brazil)

Rodrigues

Silva

Reis

et al. 2021

Water

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The São Francisco River basin is one of the largest in the Brazilian territory. This basin has enormous economic, social and cultural importance for the country. Its water is used for human and animal supply, irrigation and energy production. This basin is located in an area with different climatic characteristics (humid and semiarid) and studies related to precipitation are very important in this region. In this scenario, the objective of this investigation is to present an assessment of rainfall estimated through the Integrated Multi-SatellitE Retrievals for Global Precipitation Measurement (IMERG) product compared with rain gauges over the São Francisco river basin in Brazil. For that, a period from of 20 years and 18 surface weather stations were used to evaluate the product. Based on different evaluation techniques, the study found that the IMERG is appropriate to represent precipitation over the basin. According to the results, the performance of the IMERG product depends on the location where the rain occurs. The bias ranged from −1.67 to 0.34 mm, the RMSE ranged from 5.36 to 10.36 mm and the values of the correlation coefficients between the daily data from the IMERG and rain gauge ranged from 0.28 to 0.61. The results obtained by Student t-test, density curves and regression analysis, in general, show that the IMERG is able to satisfactorily represent rain gauge data. The exception is the eastern portion of the basin, where the product, on average, underestimates the precipitation (p-value < 0.05) and presents the worst statistical metrics.

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Section: Study Areamentioning

confidence: 99%

Evaluation of the Integrated Multi-SatellitE Retrievals for the Global Precipitation Measurement (IMERG) Product in the São Francisco Basin (Brazil)

Rodrigues

Silva

Reis

et al. 2021

Water

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“…As highlighted in the present study, the semiarid region of northeastern Brazil is characterized as the region most vulnerable to droughts. Besides that, water scarcity and little knowledge about trends in water loss through evaporation and transpiration (evapotranspiration) request further researches (Cabral Júnior et al, 2019). Thus, the ETo is a determining factor in understanding droughts in the semiarid region.…”

Section: Resultsmentioning

confidence: 99%

“…Thus, the ETo is a determining factor in understanding droughts in the semiarid region. Drought events linked to climate change promote variations in meteorological parameters, mainly affecting ETo and consequently the crop water requirement in the irrigation areas (Cabral Júnior et al, 2019).…”

Section: Resultsmentioning

confidence: 99%

Comparison of the Reference Evapotranspiration among Empirical Methods and Penman-Monteith in Semiarid Region of Northeastern Brazil

Silva

Bezerra

Almeida

et al. 2021

Rev. Bras. Geog. Fis.

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The reference evapotranspiration (ETo) is a complex measure essential to water resources planning and management, irrigation scheduling, and rational agricultural water use. This research aimed to evaluate the performance of the empirical methods in estimating reference evapotranspiration based on daily meteorological data of the surface and comparing them with the standard method of Penman-Monteith (PM-FAO 56), during the period of January/2004 to December/2013 for the climatic conditions of the semiarid region of Brazil. Five empirical methods were evaluated: Hargreaves -Samani (HS), Camargo (C), Thornthwaite (Th), Priestley-Taylor (PT), and Jensen-Haise (JH). For this purpose, maximum air temperature (Tmax, ºC) and minimum (Tmin, ºC); maximum air relative humidity (RHmax, %) and minimum (RHmin, %); maximum air atmospheric pressure (Pmax, kPa) and minimum (Pmin, kPa); average wind speed at a height of 2 meters (u2m, m s -1 ); global solar radiation (MJ m -2 ); and precipitation (mm) were used at this study. Analysis data were executed using descriptive statistics, correlation, dispersion, and statistical accuracy indexes to compare empirical models with the PM -FAO 56. The JH method overestimated the standard Penman-Monteith method, and underestimated by the HS, C, Th, and PT methods, on a monthly average scale. In general, HS and JH methods had bett er adjustments with PM-FAO 56, on a daily scale. In conclusion, empirical methods, on a daily scale, presented good correlations and satisfactory statistical indices, being important in agricultural planning and irrigation management, becoming a good alternative for semiarid conditions of Petrolina -PE in San Francisco mesoregion.

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“…Situated between latitudes 1 and 18°S and longitudes 34 and 48°W, the NEB region (Figure 1) is located east of the Amazon forest and west of the Atlantic Ocean. Most of its area is characterized by the semiarid climate, with a remarkable spatial and temporal variability of rainfall and high evapotranspiration rates, thus showing marked interannual variability (Marengo, 2010; Cabral Júnior et al ., 2019; Medeiros et al ., 2020). According to Cirilo et al .…”

Section: Methodsmentioning

confidence: 99%

Influence of the modes of climate variability in the Tropical Pacific and Atlantic on accumulated rainfall and reservoir water volumes in the Northeast Brazil

Gomes

Lima

2021

Intl Journal of Climatology

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The volumes of artificial reservoirs as well as the accumulated rainfall over the Northeast region of Brazil (NEB) are sensible to the modes of climate variability. Thus, the objective of this study is to identify the relationship between the spatial patterns of the modes of climate variability in the Tropical Atlantic and Pacific Oceans, and the homogeneous rainfall subregions affecting the recharge of the water volumes of reservoirs in the NEB during the period from 1986 to 2018. For this end, we used monthly rainfall; monthly water volume data for artificial reservoirs; sea surface temperature anomalies in the Tropical Pacific and Tropical Atlantic Ocean. The first step was to apply cluster analysis to subdivide the NEB according to the monthly rainfall climatology. After, the technique of synthetic maximum rainfall series was applied. Then, the response time between rainfall climatology and reservoir water volume climatology was identified by means of cross‐correlation. Finally, the partial least squares regression was applied to infer the relationship between synthetic maximum rainfall series in each subregion and the modes of climate variability. Results showed that five homogeneous rainfall subregions with three distinct wet seasons. The synthetic time series of rainfall in the subregions were positively correlated with the climatology of the reservoir volumes with lags of up to 5 months after the beginning of the series. Both rainfall and the water volume of artificial reservoirs were sensible to the modes of climate variability of the studied oceans.

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Detecting linear trend of reference evapotranspiration in irrigated farming areas in Brazil’s semiarid region

Cited by 32 publications

References 35 publications

Evaluation of the Integrated Multi-SatellitE Retrievals for the Global Precipitation Measurement (IMERG) Product in the São Francisco Basin (Brazil)

Evaluation of the Integrated Multi-SatellitE Retrievals for the Global Precipitation Measurement (IMERG) Product in the São Francisco Basin (Brazil)

Comparison of the Reference Evapotranspiration among Empirical Methods and Penman-Monteith in Semiarid Region of Northeastern Brazil

Influence of the modes of climate variability in the Tropical Pacific and Atlantic on accumulated rainfall and reservoir water volumes in the Northeast Brazil

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