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5 mai 2015
- handle: 10670/1.vfuvt8
- halshs: halshs-01149966
- doi: 10.1007/s10584-015-1415-1
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info:eu-repo/semantics/altIdentifier/doi/10.1007/s10584-015-1415-1
Mots-clés
Rainfall Amazonia trends Mann-KendallSujets proches
Rainfall Rain Methods of analysis Analysis and chemistry Analytical methods Chemical analysis Analysis methods Analysis and examinationCiter ce document
Nathan Debortoli et al., « Rainfall Patterns in the Southern Amazon: a chronological perspective (1970-2010). », HAL-SHS : géographie, ID : 10.1007/s10584-015-1415-1
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Résumé
The aim of this study is to characterize rainfall patterns in a vast transition zonebetween the Amazon and the Cerrado Biomes. The analysis is focused on annual and seasonaltendencies, mainly about the onset and offset of the rainy season, its length and shifts. Morethan 200 Rain Gauges (RGs) were analyzed in the study area using Pettitt’s and Mann-Kendall’s non-parametric tests allied to a Linear Regression Analysis over the period 1971–2010. The onset and offset dates of the rainy season and its duration are also identified for 89RGs. Pettitt’s test indicates ruptures in 16 % of the rainfall time series while Mann-Kendall’smonthly test indicates that 45%of the RGs had negative trends, mainly in the transition seasons(spring and austral autumn). Linear Regression Analysis indicates negative trends in 63 % ofthe time series concomitant to the rainy season onset and offset analysis, which confirmes adelay for the onset of the rainy season in 76 % of the RGs and a premature demise for 84 % oftheRGs. Identification of the tendencies for rainy season duration indicates that the rainy seasonhas become shorter at 88 % of the RGs. There were recurring patterns in the results displayingdrier conditions in RGs localized in deforested areas opposed to forested locations.