Uma análise do ambiente sinótico que contribuiu para a baixa pluviosidade na Paraíba em 1992.

Abstract

The annual precipitation in the state of Paraiba was reduced by about 22% during the dry year of 1992. Based on this fact a study was conducted with the objective of identifying which of the meteorological parameters and phenomena were related to the low precipitation observed during the year of 1992. With the objective of conducting a detailed analysis of the rainfall distribution, the Paraiba State was divided into four sub-regions: Sertao, Cariri, Agreste and Litoral. Later it is verified to what extent these regions were affected by the drought and their relations with the climatic anomalies observed during this period. Mean monthly fields of various meteorological parameters obtained from CAC/NWS were analized. The analyses show that the Cariri region of Paraiba suffered greatly from the drought of 1992 with a decrease of about 60% in its annual rainfall, the Litoral region suffered the least, drought conditions were more intense in the western part of the state than in the eastern part. Another important characteristic observed is that some phenomena generally known as inhibitors of precipitation over NEB do not explain completely the low rainfall registered in the year of 1992 over the Paraiba State. It is suggested that other factors such as the combined effect of presence in the atmosphere of vulcanic dust from the 1991 eruption of Pinatubo in the Philippines and the ENSO episode seem to have played a part in producing unfavourable conditions for precipitation over NEB and particularly over the State of Paraiba.