Interdecadal variability and extreme precipitation events in South America during the monsoon season

The study uses a rotated empirical orthogonal function analysis of data from 1950-2009 to examine interdecadal variability in South American monsoon precipitation. It finds that interdecadal oscillations have a significantly greater relative impact on extreme daily rainfall than on moderate or light rainfall, with this impact being more linear during the spring than the summer.

• The study confirms the robustness of interdecadal variability modes of precipitation during the monsoon season by using a data set spanning 1950-2009, finding results consistent with previous research.
• Analysis using the Kolmogorov-Smirnov test indicates that daily precipitation from opposite phases of interdecadal modes belongs to different frequency distributions, with a significance level better than 0.01 in regions with high factor loadings.
• Interdecadal oscillations exert a much stronger relative influence on extreme daily rainfall ranges compared to light and moderate rainfall, and this effect is more linear in the spring than in the summer.

APA

Inter-American Institute for Global Change Research (2025). Interdecadal variability and extreme precipitation events in South America during the monsoon season. https://iai.int/es/pub_acad/interdecadal-variability-and-extreme-precipitation-events-in-south-america-during-the-monsoon-season/

Chicago

Inter-American Institute for Global Change Research. Interdecadal variability and extreme precipitation events in South America during the monsoon season. 2025. https://iai.int/es/pub_acad/interdecadal-variability-and-extreme-precipitation-events-in-south-america-during-the-monsoon-season/.

Wikipedia

{{cite report |author=Inter-American Institute for Global Change Research |title=Interdecadal variability and extreme precipitation events in South America during the monsoon season |date=13 January 2025 |url=https://iai.int/es/pub_acad/interdecadal-variability-and-extreme-precipitation-events-in-south-america-during-the-monsoon-season/ |access-date=17 August 2026 |via=Climate Insights Directory}}

BibTeX

@techreport{interamericaninstituteforglobalchangeresearch2025interdecadal, author = {{Inter-American Institute for Global Change Research}}, title = {{Interdecadal variability and extreme precipitation events in South America during the monsoon season}}, institution = {Inter-American Institute for Global Change Research}, year = {2025}, month = jan, url = {https://iai.int/es/pub_acad/interdecadal-variability-and-extreme-precipitation-events-in-south-america-during-the-monsoon-season/}, urldate = {2026-08-17}, note = {Indexed by Climate Insights Directory} }