Abstract
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 precipitation in the range of 17, 13 and 9 years. It is suggested a study with series of larger years in order to verify the fluctuations and the contributions of the El Niño(a) phenomena in the studied area.
Highlights
Precipitation is considered a relevant factor in the provision of various socioeconomic and environmental activities, in which hydroelectric plants, industries, agriculture and cattle raising and the increase of reservoir levels for human supply purposes stand out
With the objective of analyzing climate changes on the Northeast of Brazil (NEB) and aiming at the importance of conceptualizing the processes that influence the pattern of pluviometric distributions, both spatial and temporal, it was observed that the relevant factor to be highlighted is the irregularity of the distributions of the rainfall indexes, associated with the high interannual variability of precipitation in the tropical region, with dry and rainy years
There are the effects of the northeast trade winds together with the effects of sea breeze, aided by the formation of the South Atlantic Cyclonic Vortexes (SACVs), the instability lines (IL), the Dipole Pattern (DP) in the Tropical Atlantic Ocean and wave disturbances in the field of trade winds, providing events for droughts, floods, inundations, overflow of rivers, dams, muds, ponds, lakes and streams
Summary
Precipitation is considered a relevant factor in the provision of various socioeconomic and environmental activities, in which hydroelectric plants, industries, agriculture and cattle raising and the increase of reservoir levels for human supply purposes stand out. With the objective of analyzing climate changes on the NEB and aiming at the importance of conceptualizing the processes that influence the pattern of pluviometric distributions, both spatial and temporal, it was observed that the relevant factor to be highlighted is the irregularity of the distributions of the rainfall indexes, associated with the high interannual variability of precipitation in the tropical region, with dry and rainy years. Precipitation is a climatic element with greater temporal space variability For this reason, the study of extreme events of maximum daily annual precipitation is related to severe damage to human activities in all regions of the world, due to its potential to cause water saturation of the soil, runoff and erosion in accordance with the Intergovernmental Panel on Climate Change (IPCC) (2007) and Tammets et al (2013). This study is relevant, since the studied area is characterized by having a variability in rainfall indexes and a diversity in soil occupation patterns, where the impacts of rainfall have a great influence on the studied area, extreme events affect the socioeconomic, agricultural and livestock issues and the damming of water
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