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Climate 2017, 5(3), 47; doi:10.3390/cli5030047

Variations of Rainfall Rhythm in Alto Pardo Watershed, Brazil: Analysis of Two Specific Years, a Wet and a Dry One, and Their Relation with the River Flow

Department of Geography, Institute of Geosciences and Exact Sciences, São Paulo State University (UNESP), 1515 24A Avenue, Rio Claro, São Paulo 13506-900, Brazil
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Authors to whom correspondence should be addressed.
Academic Editors: Valdir Adilson Steinke and Charlei Aparecido da Silva
Received: 1 May 2017 / Revised: 26 June 2017 / Accepted: 28 June 2017 / Published: 4 July 2017
(This article belongs to the Special Issue Studies and Perspectives of Climatology in Brazil)
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Abstract

This research aims to understand the variability and rhythm of rainfall for two specific standard-years, and their relation with the river flow of the Alto Pardo watershed, located in southeastern Brazil, and thus identify atmospheric systems that can cause extreme events, and which may be reflected in heavy rainfall, floods, or drought episodes. Therefore, the research chose to investigate the years 1983 and 1984, rainy and dry standard-years respectively in the study area, where rainfall was described and spatialized through the geostatistical method of kriging at the monthly level and the rhythmic analysis technique was applied in order to identify what weather types are usual and extreme in the area. The results indicate that a high involvement of the frontal system in the year 1983 was responsible for the episodes of greater rainfall and peak water flow, especially in stationary front episodes. The year 1984 presented low rainfall in summer, a meteorological drought during the year, and the predominance of tropical air masses in relation to the frontal systems. The comparison between the two extreme years, a wet and a dry one, made it possible to understand the frequency and the chaining of the atmospheric systems during this period for the Alto Pardo watershed. View Full-Text
Keywords: rainfall; rhythmic analysis; weather types; Pardo River; Brazil rainfall; rhythmic analysis; weather types; Pardo River; Brazil
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Fontão, P.A.B.; Zavattini, J.A. Variations of Rainfall Rhythm in Alto Pardo Watershed, Brazil: Analysis of Two Specific Years, a Wet and a Dry One, and Their Relation with the River Flow. Climate 2017, 5, 47.

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