ContribuiÇÃo aos estudos da precipitaÇÃo no estado do paranÁ: A oscilaÇÃo decadal do pacÍfico - ODP

Abstract

The major teleconnections of low frequency observed into Pacific Ocean, the Pacific Decadal Oscillation - PDO has been discussed as recurrent in the decadal temporality (20 and 30 years). The oscillation is characterized by surface sea temperatures, and it shows associations between regional climate dynamics, mostly in the rainfall variability. The studies that combined oscillation and rainfall dynamics in Paraná State (localizated in South of Brasil) were indirectly obtained. In this context, the aim is to present the PDO'characteristics, associations and spatial and temporal correlations of rainfall in the state, obtained by statistical tests. The objetctive is contribute to genesis and production rains studies, considering the decadal raifall variability, and highlighting the PDO like one pattern teleconnection. We used months data series from 1976 to 2011, with rainfall data and number of rain days grouped into quarterly, seasonal and annual scales. The PDO was representend by annual index. The characterization was processed by the association through the temporal similarity. The correlations were obtained by linear correlation coefficient of Pearson. In general the PDO influence was 11 to 20%, and for the numbers of rain days was 17 to 46%, it is suggesting a weak and weak-moderate correlations. This results supports the understanding of rainfall in tropical areas, and also points interpretative approaches to regional and local impacts of teleconnections influence in variability.