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

14 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
Pages (from-to)2110-2132
Number of pages23
JournalHydrological Sciences Journal
Volume61
Issue number11
DOIs
StatePublished - 17 Aug 2016
Externally publishedYes

Keywords

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

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