Coerência entre precipitação em núcleos de desertificação brasileiros e variabilidade do Oceano Pacífico

Le résumé fourni par la source

Desertification is a process of degrading soil modification in dry regions, leading them to desert aspects, as a result of climatic variations and/or human activities. This study aims to analyze the coherence between precipitation in desertification nuclei (DNs) in northeastern Brazil and the variability of the Ocean Pacific, in addition to identifying precipitation trends in the DNs. Precipitation data from the cities that make up the DNs from the National Water Agency and the National Institute of Meteorology were used for the period from 1981 to 2020 for Irauçuba, 1961 to 2019 for Cabrobó, 1971 to 2019 for Gilbués and 1989 to 2019 for Seridó. The Southern Oscillation index (SOI) was obtained from the Earth System Research Laboratory/National Oceanic and Atmospheric Administration. In all the DNs studied, the Wavelet analysis revealed that the highest rainfall records occurred due to the simultaneous action of different phenomena, which attenuated the total rainfall. The cross wavelet showed coherence between the precipitation series and the SOI in each DN, revealing that the maximum precipitation in most DNs occurs simultaneously with maximum SOI or in de La Niña developing stage. The relationship between the climatic phenomena and the series of precipitation can contribute to the climate forecast for the DNs.

Ce résumé expose les affirmations des auteurs. BNTIC ne l’interprète pas comme une validation indépendante des résultats.