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

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 Americ...

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Bibliographic Details
Published in:Hydrological sciences journal 2016-08, Vol.61 (11), p.2110-2132
Main Authors: Valdés-Pineda, Rodrigo, Pizarro, Roberto, Valdés, Juan B., Carrasco, Jorge F., García-Chevesich, Pablo, Olivares, Claudio
Format: Article
Language:English
Subjects:
bootstrapping
Brackish
climatic aggressiveness
concentration of precipitation
Gumbel PDF
Mann-Kendall
Marine
precipitation trends
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Summary: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.
ISSN:0262-6667
2150-3435
DOI:10.1080/02626667.2015.1085989