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Este trabalho avalia a variabilidade temporal e espacial das precipitacoes da Bacia Hidrografica do Rio Mundau - Ceara, investigando relacoes entre as alteracoes climaticas em curso na escala mundial, e possiveis alteracoes em escala regional e suas consequencias na hidrologia local. Para a realizacao deste trabalho, foram analisadas series historicas de precipitacoes dos postos pluviometricos da FUNCEME localizados nas proximidades da serra de Itapipoca, sertao e na regiao costeira ao longo da bacia no periodo de 1976 a 2017.  Foram feitas analises estatisticas para obtencao das medias e do desvio padrao, alem da realizacao de testes de tendencias e correlacao. O comportamento pluviometrico ao longo do tempo foi analisado atraves do metodo IAC – Indice de Anomalias de Chuvas, possibilitando a identificacao de periodo com anomalias de positivas e periodos com anomalias negativas, alem da relacao destas anomalias com as oscilacoes de temperatura do Oceano Pacifico central. A analise do IAC mostra uma leve predominância de anomalias negativas de chuvas na area da bacia, com ciclos de anos secos e anos umidos, sendo o ultimo periodo de 2012 a 2016 o periodo seco mais prolongado da serie, mesmo assim nao se identifica alteracao consistente no clima regional na serie estudada. Dois dos quatro postos analisados apresentaram tendencias negativas de precipitacoes, contudo a media geral da bacia as tendencias foram proximas de zero. Foi observado aumento de anomalias negativas de chuvas em todos os postos e uma significativa relacao de anomalias negativas de chuvas com o fenomeno ENOS. A B S T R A C T This work evaluates the temporal-spatial variability of the rainfall in the Mundau River basin - Ceara, seeking for relationships between ongoing climate changes on a global scale and possible changes in regional scale and its affects in the local hydrometeorology. For the accomplishment of this work, historical data series of precipitations from raingauge stations of the FUNCEME located in the vinicity of the mountain of Itapipoca, Sertao and in the coastal region along the valley of the Mundau River basin were analyzed from 1976 to 2017. Statistical analysis was performed to obtain the means and the standard deviations, in addition to performing trend and correlation tests. The rainfall variability over time was analyzed through the IAC – Rainfall Anomalies Index, allowing the identification of the period with positive anomalies with Sea Surface Temperature in central Pacific Ocean. The IAC show a slight predominance of negative rainfall anomalies, with cycles of dry years and wet years, the last dry period covered 2012 to 2016 being the longest dry period of the historical record, even though no consistent changes are identified in the local climate from the time series studied. Two of the four stations analyzed presented negative trends, but the overall basin mean had almost zero trend. It was observed increase of negative anomalies in all the stations and a significant relation of negative anomalies during warm phase of the ENSO. keywords – Climate, Mundau River, precipitation

revista brasileira de geografia física

Avaliação Interanual das Anomalias de Chuvas da Bacia Hidrográfica do Rio Mundaú - Ceará (Interannual Evaluation of Rainfall Anomalies in the Mundaú River Basin - Ceará)