Spatio-temporal trends of precipitation, its aggressiveness and concentration, along the Pacific coast of South America (36–49°S)

Rodrigo Valdés-Pineda, Roberto Pizarro, Juan B. Valdés, Jorge F. Carrasco, Pablo García-Chevesich, Claudio Olivares

Research output: Contribution to journalArticlepeer-review

8 Scopus citations

Abstract

Precipitation is the most critical climatic element that directly affects the availability of water resources. The objective of this study was to describe and discuss spatio-temporal patterns of annual precipitation, its aggressiveness, and its concentration along the southwest coast of South America (36°–49°S) from 1930 to 2006. An annual and multi-decadal analysis was applied to 107 sampling stations distributed throughout this region, using the Mann-Kendall test (MK), and the Sampling Uncertainty Analysis (SUA) coupled with Gumbel probability density function (SUA-Gumbel). The analysis revealed positive but not significant trends in annual precipitation and aggressiveness for the region between 36° and 44°S, at least during the last 50 years of the analysed period. However, a significant decrease in annual precipitation and aggressiveness was observed between 44° and 49°S during the same period. The annual concentration of precipitation became slightly more seasonal in the last 50 years within the entire study area.

Original languageEnglish (US)
Pages (from-to)2110-2132
Number of pages23
JournalHydrological Sciences Journal
Volume61
Issue number11
DOIs
StatePublished - Aug 17 2016

Keywords

  • Gumbel PDF
  • Mann-Kendall
  • bootstrapping
  • climatic aggressiveness
  • concentration of precipitation
  • precipitation trends

ASJC Scopus subject areas

  • Water Science and Technology

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