Spatiotemporal characteristics and synchronization of extreme rainfall in South America with focus on the Andes Mountain range

Niklas Boers, Bodo Bookhagen, Norbert Marwan, Jurgen Kurths

Research output: Contribution to journalArticle

26 Citations (Scopus)

Abstract

The South American Andes are frequently exposed to intense rainfall events with varying moisture sources and precipitation-forming processes. In this study, we assess the spatiotemporal characteristics and geographical origins of rainfall over the South American continent. Using high-spatiotemporal resolution satellite data (TRMM 3B42 V7), we define four different types of rainfall events based on their (1) high magnitude, (2) long temporal extent, (3) large spatial extent, and (4) high magnitude, long temporal and large spatial extent combined. In a first step, we analyze the spatiotemporal characteristics of these events over the entire South American continent and integrate their impact for the main Andean hydrologic catchments. Our results indicate that events of type 1 make the overall highest contributions to total seasonal rainfall (up to 50%). However, each consecutive episode of the infrequent events of type 4 still accounts for up to 20% of total seasonal rainfall in the subtropical Argentinean plains. In a second step, we employ complex network theory to unravel possibly non-linear and long-ranged climatic linkages for these four event types on the high-elevation Altiplano-Puna Plateau as well as in the main river catchments along the foothills of the Andes. Our results suggest that one to two particularly large squall lines per season, originating from northern Brazil, indirectly trigger large, long-lasting thunderstorms on the Altiplano Plateau. In general, we observe that extreme rainfall in the catchments north of approximately 20∘S typically originates from the Amazon Basin, while extreme rainfall at the eastern Andean foothills south of 20∘S and the Puna Plateau originates from southeastern South America.
Original languageEnglish
Pages (from-to)601-617
Number of pages17
JournalClimate dynamics
Volume46
Issue number1
Early online date18 Apr 2015
DOIs
Publication statusPublished - Jan 2016

Keywords

  • extreme rainfall
  • synchronization
  • complex networks
  • South American monsoon system

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