Precipitation regionalization of the Brazilian Amazon

Abstract

The Brazilian Amazon is a large territory, where different weather systems act, contributing to non-homogeneity of the rainfall seasonal distribution in the region. The aim of this study is to determine sub-regions of homogeneous precipitation in the Amazon, linking them to the main atmospheric systems that affect the rainfall in the region. For this, hierarchical cluster analysis was applied on a data set composed by 305 rain gauges. The results suggest that the Brazilian Amazon has six pluvial homogeneous regions.