Intraseasonal teleconnections between South America and South Africa

The research identifies strong intraseasonal teleconnections between South American and South African daily rainfall, with South American anomalies leading by 4-5 days. The mechanisms vary by season: summer involves both local Walker cell modulation and extratropical Rossby wave trains, while winter is dominated by Rossby wave trains and subtropical influences. These processes create circulation changes in southern Africa that favor rainfall-producing systems like cutoff lows.

• Strong intraseasonal teleconnections exist between daily rainfall in South Africa and various areas of South America, with the South American rainfall anomalies leading by 4-5 days during both winter and summer.
• The mechanisms driving these teleconnections differ by season: summer involves both a modulation of the local Walker cell and extratropical Rossby wave trains, whereas winter is primarily driven by Rossby wave trains.
• Seasonal differences also exist in the regions of influence; tropical convective anomalies over South America are significant in summer, while the subtropics are more important in winter. Both processes result in circulation changes over southern Africa that support rainfall-producing systems such as tropical extratropical cloud bands and cutoff lows.

APA

Inter-American Institute for Global Change Research (2025). Intraseasonal teleconnections between South America and South Africa. https://iai.int/es/pub_acad/intraseasonal-teleconnections-between-south-america-and-south-africa/

Chicago

Inter-American Institute for Global Change Research. Intraseasonal teleconnections between South America and South Africa. 2025. https://iai.int/es/pub_acad/intraseasonal-teleconnections-between-south-america-and-south-africa/.

Wikipedia

{{cite report |author=Inter-American Institute for Global Change Research |title=Intraseasonal teleconnections between South America and South Africa |date=15 January 2025 |url=https://iai.int/es/pub_acad/intraseasonal-teleconnections-between-south-america-and-south-africa/ |access-date=17 August 2026 |via=Climate Insights Directory}}

BibTeX

@techreport{interamericaninstituteforglobalchangeresearch2025intraseasonal, author = {{Inter-American Institute for Global Change Research}}, title = {{Intraseasonal teleconnections between South America and South Africa}}, institution = {Inter-American Institute for Global Change Research}, year = {2025}, month = jan, url = {https://iai.int/es/pub_acad/intraseasonal-teleconnections-between-south-america-and-south-africa/}, urldate = {2026-08-17}, note = {Indexed by Climate Insights Directory} }