SEASONAL AND INTERANNUAL ANALYSIS OF PRECIPITATION ON THE PIAUIENSE COAST BY THE METEOROLOGICAL STATION OF PARNAÍBA-PI

• DOI: 10.22533/at.ed.3172252201112

• Palavras-chave: Lagoado Portinho, Coast, Precipitation, Normal weather, Parnaíba.

• Keywords: Lagoado Portinho, Coast, Precipitation, Normal weather, Parnaíba.

• Abstract:

  This work deals with the behavior of annual and historical precipitation in Lagoa do Portinho, through data from the automatic meteorological station of the Instituto Nacional de Meteorologia (INMET) located in Parnaíba, Piauí. Based on the bibliography on the climate, it was sought to explain the behavior of rainfall in the region, from the global to the local scale, with the objective of clarifying the behavior of the climatological normal elaborated, as well as its accumulated precipitation values ​​in each month. Data were found for the climatological normal for the period from 1961 to 1990, but monthly precipitation data were only available from 1971 to 1985 and from 1994 to the present. In this way, it was not possible to have uninterrupted coverage from 1960 to the present, but it was still possible to show the behavior of the rains from 1994 to today, as well as annual rainfall totals for the same period. The results showed that the drought occurs in the second semester of the year, with minimum values ​​in August, while the rainy season occurs in the first half of the year, with maximum values ​​in April. Rainfall is mainly regulated by global-scale phenomena, such as the warming of the waters of the Pacific (ElNiño) and the displacement of the ITCZ ​​to the south during the summer, the former justifying the drought period, while the latter is responsible for the rains.