Estudos de eventos extremos de chuva persistente sobre o Rio Grande do Sul entre 2004 e 2013

Abstract

Persistent rainfall is an atmospheric phenomenon which cause several negative impacts on society. This study has the main purpose to investigate atmospheric conditions responsible for extreme events of persistent rainfall occurred in state of Rio Grande do Sul in the 2004-2013 period. It was applied a Principal Sequence Pattern (PSP) analysis to the 24 extreme events identified in the 10 - year period, to search for atmospheric patterns in the sea-level pressure fields within the beginning of the events. It was observed a higher frequency of occurrence in winter, but stronger and more persistent events have occurred in autumn and spring seasons. The atmospheric pattern associated with these events shows the action of frontal systems that stay semi-stationary over this region.