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O estudo objetivou investigar o comportamento da precipitacao pluvial e sua possivel interacao com as caracteristicas fisicas do relevo nas microrregioes do Cariri Oriental e Ocidental do Estado da Paraiba. Foram utilizados dados de um modelo digital de elevacao (MDE) para obtencao de informacoes do relevo e dados de precipitacao pluvial de 9 municipios da microrregiao do Cariri Oriental e 13 do Cariri Ocidental. O teste de Mann-Kendall foi utilizado para identificacao de tendencia nas series temporais e o metodo de Sen para quantificacao da tendencia. O metodo de interpolacao utilizado para a espacializacao dos valores da precipitacao pluvial e da estatistica MK foi o geoestatistico (krigagem). Os principais resultados evidenciam que a precipitacao pluvial media anual apresenta variacao crescente no sentido Leste - Oeste das microrregioes estudadas, com minimo de 320 mm.ano-1 em Cabaceiras e maximo de 680 mm.ano-1 nos municipios de Prata e Ouro Velho; a microrregiao do Cariri Oriental e menos chuvosa que o Cariri Ocidental, o que se deve, em partes, as baixas altitudes, caracterizando uma regiao interplanaltica; ha uma tendencia de reducao nao significativa da precipitacao pluvial na microrregiao do Cariri Ocidental, com nucleo mais acentuado no municipio de Camalau. Entretanto, na microrregiao do Cariri Oriental ocorre um acrescimo significativo da precipitacao, com nucleo mais acentuado no municipio de Cabaceiras. A B S T R A C T The study aimed to investigate the behavior of rainfall and its possible interaction with the physical characteristics of the relief in the regions of Eastern and Western Cariri of Paraiba State. Data from a digital elevation model were used (MDE) to obtain information Relief and rainfall data of 9 municipalities in the Eastern Cariri micro region and 13 in the Western Cariri. The Mann-Kendall test was used to identify trend in time series and Senmethod for quantification of the tendency. The interpolation method used for the spatial values of rainfall and statistics MK was the geostatistical (kriging). The main results show that the average annual precipitation has increased variation in the east direction - west of the studied micro-regions, with a minimum of 320 mm.ano-1 in Cabaceiras and maximum of 680 mm.ano-1 in the municipalities of Ouro Velho and Prata; the micro Eastern Cariri is less rainy than the western Cariri, which is due, in part, to low altitudes, featuring a interplanaltica region; there is no significant downward trend of rainfall in the micro region of West Cariri, with stronger core in the municipality of Camalau. However, in the Eastern Cariri micro region is a significant increase in precipitation, with stronger core in the municipality of Cabaceiras. Keywords: semiarid, trend analysis, spatial and temporal variability.

Comportamento da Precipitação Pluvial e sua Relação com o Relevo nas Microrregiões do Cariri Oriental e Ocidental do Estado da Paraíba (Rainfall Behavior Rain and Its Relationship with Relief in the Regions Cariri of Eastern and Western State of Paraíba)