Juazeirinho Paraíba: Brazil and its rain oscillations (original) (raw)
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Basin of upper Paraíba river course – PB, Brazil and its rainfall analysis
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Precipitation is of extreme importance for the management of water resources, since it is a question of degraded areas and with deforestation for deforestation and the withdrawal of firewood. Frequency analysis was performed on the annual rainfall totals by drawing up the graphs. The scale proposed by Meis et al. (1981), and by the meteorological and CPTEC/INPE nuclei, and provided by Xavier et al. (2005), the annual values that approached the mean value were characterized as intermediaries, and in the scale of annual precipitation values, those that moved away 25% away from the average were considered as very rainy years, and below 25%, like dry years. The application of the Student's t test of significance, pointed out that precipitation data in general are 99% significant. The results showed a tendency of reductions in the rainfall indices, with oscillations of precipitations throughout the series 1962 to 2019, and evidenced the recurrence of maximum values of annual prec...
Journal of Agronomy, 2015
In order to generate information relevant to the Mato Grosso do Sul (MS), the aim was analyze the occurrence of wet and drought periods through the SPI using Standardized Precipitation Index (SPI) in this Brazilian State. Rainfall data of 29 stations (sites) of MS were obtained of the National Water Agency Database collected from 1983-2013. At each site and year, the rainfall daily data were added up to obtain the monthly rainfall (mm monthG 1), of each month of the year. Thus, were formed 348 time series (12 months×29 sites), that it were used to calculate the SPI in annual scale. The fit was found Normal distribution of 384 time series of monthly rainfall using the Kolmogorov-Smirnov test. The SPI is able to identify the drought and wet periods, when the occurrence of ENOS events, regardless of categorization, in Mato Grosso do Sul State, Brazil. The analysis of the relative frequencies shows that the moderately drought and wet categories stands out about the other categories of SPI. The moderately drought category occurs in episodes of El Niño strong and moderate and moderately wet category in episodes of La Niña strong and weak.
Decadal precipitation in the municipal area of Paudalho - Pernambuco, Brazil
International Journal of Science and Research Archive, 2022
The objective is to carry out a climatological analysis of decadal precipitation and its historical comparisons using the historical series of rainfall from 1967 to 2015, which can contribute to decisions in sectors such as the economy, agriculture, irrigation, energy production, water resources, agronomic engineering, agricultural engineering, irrigation fire department, civil defense and government decision makers in case of extreme precipitation events that may occur in the future. The data were acquired from the Pernambuco Water and Climate Agency of the state of Pernambuco in the period from 1967 to 2015, for which the calculations of basic statistics were applied to define the decades of studies and their respective averages. The inter-neighborhood variability of rainfall distribution and local activities in conjunction with the active meteorological factors contributed or did not contribute to agricultural productivity, human and animal storage and supply. The study can be a tool for planning and actions aimed at the best way to manage water resources using capture and storage systems (taking advantage of the first months with high precipitation rates) and avoiding the problem of water scarcity.
Revista Brasileira de Geografia Física, 2020
Reference evapotranspiration (ET0) plays an important role in the planning of irrigation and the water demand of crops, as well as in the planning of water uses in watershes. The identification of trends in ET0 under climate changes is important to understand its effects on agriculture, water balance and water resources planning. The goal of this work was verify whether there was or there was not an increasing/decreasing trend on ET0 in dry and rainy periods, as well as in annual period, identifying the influencing climate variables on ET0 in the state of Paraíba, Brazil. In order to determine the ET0 trend in the series the Mann-Kendall nonparametric test was used, whereas the series slope was determined by applying Sen’s estimator. To identify the most influencing clilmatic variable it was performed a multiple regression of normalized data. The data were obtained of six stations with monthly data from January 1961 to December 2015, a total period of 55 years. Results showed increa...
Revista Brasileira de Ciências Ambientais
This paper addresses a methodology for analyzing spatio-temporal rainfall variability as a tool to support action planning that could mitigate negative impacts and reduce conflicts over water use in the Pajeú river basin, located in the semi-arid region of the state of Pernambuco. We used daily rainfall data from 11 rainfall stations, between 1964 and 2016, provided by the Pernambuco Water and Climate Agency (Agência Pernambucana de Águas e Clima — APAC) and the National Water Agency (Agência Nacional de Águas — ANA). This analysis employed the RClimDex software to calculate rainfallrelated climate extremes indices, aiming at monitoring and detecting climate changes and alterations in the regional rainfall pattern. The results indicated a change in the rainfall pattern in the Pajeú river basin, and all climate indices obtained converge toward the increase in water scarcity in the area, contributing to the recurrent droughts that impact the region.
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Irregularities in rainfall distribution system in the semiarid Paraiba and the frequent droughts associated to the absence of appropriate public politics, hinder economic and social development, especially, of the micro-region more drought of the state of Paraíba, in northeastern Brazil. In view of this, it explains the need for rainwater catchment’s as a way to increase the offer of water, being the estimate the main objective. For its realization, we used monthly rainfall series of the two driest locations of said micro region and based on the criterion of statistical climatology was established rainfall patterns and adopting six annual regime scenarios (median, the driest year and the rainier and levels of 25, 50 and 75 % probability). The statistical data analysis was done using frequency statistical distributions and measures of central tendency and dispersion. The main results showed that the rainfall regime is asymmetric, extremely variable and the short rainy season lasts ab...
Space-time variability of evapotranspiration and precipitation in the State of Paraná, Brazil
Ambiente e Agua - An Interdisciplinary Journal of Applied Science
Long-term changes in important weather variables such as evapotranspiration (ET) and precipitation are expected as a response to climate change. These changes may require adjustments to current strategies of planning and management of water resources. The objective of this work was to conduct a spatiotemporal characterization of evapotranspiration in the State of Paraná, Brazil, including in this approach a temporal trend analysis. A similar analysis was also conducted for precipitation. Thus, the historical data (1980-2010) from 33 weather stations were analyzed. The spatial distribution of the data was carried out by geostatistical techniques (ordinary kriging) and the trend analysis by the tests Mann-Kendall and Sen. According to the results, evapotranspiration increases from the coast to the interior of the state, with the highest values in the northeast and northwest regions, reaching levels of about 1200 mm yr-1. The temporal variability of the ET presented a significant upwar...
Temporal distribution of rainfall in the Far West region of Santa Catarina, Brazil
Revista Engenharia na Agricultura - Reveng, 2021
In the definition of design rainfall, one must determine the temporal distribution of rainfall. In Brazil there are few studies on the temporal distribution of heavy rainfall. This work aimed to characterize the temporal distribution of intense rainfall for the Far West region of Santa Catarina. Data from four rainfall stations were used. The rainfall was individualized and classified into four types according to the quartile with the highest intensity. With the total of 3212 rainfall events it was observed that the most frequent rains are of type I (37.6%) followed by types II (32.3%). The time variation curves of the four rainfall stations show differences of less than 5% in relation to the regional average. No significant seasonal differences were observed, however significant differences were found with respect to rainfall duration. The values of the temporal distribution with a probability of 50% were necessary for the rains of the four quartiles, as well as for the duration ra...
Long-term changes in important weather variables such as evapotranspiration (ET) and precipitation are expected as a response to climate change. These changes may require adjustments to current strategies of planning and management of water resources. The objective of this work was to conduct a spatiotemporal characterization of evapotranspiration in the State of Paraná, Brazil, including in this approach a temporal trend analysis. A similar analysis was also conducted for precipitation. Thus, the historical data (1980-2010) from 33 weather stations were analyzed. The spatial distribution of the data was carried out by geostatistical techniques (ordinary kriging) and the trend analysis by the tests Mann-Kendall and Sen. According to the results, evapotranspiration increases from the coast to the interior of the state, with the highest values in the northeast and northwest regions, reaching levels of about 1200 mm yr-1. The temporal variability of the ET presented a significant upward trend in 12% of the locations, with increases from 2.5 to 7.0 mm yr-1. Precipitation was higher in the coastal and south-central regions and the lowest amounts were identified in the northeast and northwest regions. The precipitation trend analysis indicated a significant downward trend in precipitation volume of five locations. The evapotranspiration and precipitation showed, in general, no statistically significant trends in most of the stations analyzed; however, the upward trends for ET and downward trends for precipitation indicate local changes in the State of Paraná.