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

This research paper examines the impact of interdecadal oscillations on extreme precipitation events in South America during the austral spring and summer monsoon seasons, utilizing a data set spanning 1950-2009.

• The study confirms the robustness of interdecadal variability modes of precipitation during the monsoon season using a rotated empirical orthogonal function analysis on a data set from 1950-2009, finding that spatial patterns of extreme event frequency anomalies in opposite oscillation phases closely resemble these modes.
• Application of the Kolmogorov-Smirnov test to daily precipitation series in regions with high factor loadings indicates, with a significance level better than 0.01, that daily precipitation from opposite phases of interdecadal modes belong to different frequency distributions.
• Interdecadal oscillations have a significantly greater relative impact on the extreme ranges of daily rainfall compared to moderate and light rainfall, and this impact exhibits more linearity during the spring than during 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} }