Diagnósticos de tendência de mudança climática no Nordeste Setentrional.

Abstract

The present research has as objective detects possible tendencies of climatic changes on the Septentrional Northeast. It was used data of relative humidity of the air, annual total precipitation, annual total evaporation, measure in the tank class A, and annual temperatures: medium maximum, medium minimum, average, absolute maximum and absolute minimum. The data are available in UACA/UFCG for the period of January from 1961 to December of 1990 from eight climates variables, from the meteorological stations from the Ceará, Rio Grande do Norte, Paraíba e Pernambuco States. The least square method was used to analyze the observed tendencies. Student's t-test was use to verify the reliability of the linear regression coefficients. It was verified a tendency of decrease of the relative humidity and an elevation of the evaporation. The temperatures presented increase tendencies, except for the absolute maximum. The precipitation and the annual absolute maximum didn't show predominant tendency of decline nor of increase. However, in the central part of the Area it observed a tendency of decrease of the absolute maxim. It is ended that happened increase of the temperature, mainly, with hotter nights, and of the evaporation and a decrease of the relative humidity and of the annual thermal width of the temperature inside the Septentrional Northeast.