Classificação climática e Regime Hídrico da microrregião de Recife, Pernambuco.

Abstract

Investigating dry and rainy periods and their intraseasonal and interannual variations is essential for the urban-environmental planning and, consequently, for water management. Thus, the climatic water balance was carried out by the Thornthwaite & Mather method (1955) in order to analyze the climatic characteristics, the space-time variability of the precipitation, air temperature, potential and real evapotranspiration, in addition to the water regime of the micro-region of Recife; and classify the climate types of the microregion of Recife. Average monthly rainfall values from the 1967-2017 historical series were used - data obtained from eight (8) pluviometric stations managed by the Water and Climate Agency of Pernambuco. Average air temperature data, for the same period and locations of stations, were obtained using the Estima_T software. To carry out the climatic water balance, soil water capacity of 100 mm was adopted. The results indicate that the area has average air temperature of 25°C, ranging from 26.4°C (summer) to 23.1°C (winter). Precipitation decreases in the east-west direction, with a dry period from August to March, with average monthly rainfall of 80 mm; and a rainy period, from April to July, with average of 230 mm. The space-time variability of potential evapotranspiration, real evapotranspiration, surplus, deficiency and water replacement parameters was also verified. In this sense, gradual decrease in ETP, ETR, EXC and water replacement was observed, as well as an increase of east-west DEF. These parameters were important for understanding soil moisture changes and for obtaining climate types based on summer moisture, aridity, water and ETP indices.