Southern Hemisphere subtropical front impacts on Southern African hydroclimate across the Mid-Pleistocene Transition

Rubbelke, Claire B.; Bhattacharya, Tripti; Farnsworth, Alexander; Valdes, Paul; McClymont, Erin L.; Ford, Heather

Abstract

Southern African (SA) hydroclimate is largely shaped by the interactions of atmospheric circulations, e.g., Hadley Circulation, and oceanic elements, like the Benguela Upwelling System (BUS), Agulhas System, and Antarctic Circumpolar frontal system. Large-scale changes to the Meridional Temperature Gradient (MTG) influence both the atmospheric and oceanic components of the hydroclimate system, and thus impact hydroclimate over SA. We present a leaf wax hydroclimate record from ODP 1084, in the BUS, which reveals that changes in the isotopic signature of precipitation over SA coincide with a strengthening of the MTG across the Mid-Pleistocene Transition (MPT). We use HadCM3 simulations to demonstrate the sensitivity of winter rainfall to shifts in the MTG during the MPT. Given the ongoing impacts of climate change on water resources in SA, awareness of the relationship between rainfall and shifts in Hadley Circulation could provide insight into past water availability and aid regional adaptation efforts.

Citation

Rubbelke, C. B., Bhattacharya, T., Farnsworth, A., Valdes, P., McClymont, E. L., & Ford, H. (2025). Southern Hemisphere subtropical front impacts on Southern African hydroclimate across the Mid-Pleistocene Transition. Nature Communications, 16(1), 3501. https://doi.org/10.1038/s41467-025-58792-5

• Journal Article Type: Article
• Acceptance Date: Apr 1, 2025
• Online Publication Date: Apr 12, 2025
• Publication Date: 2025
• Deposit Date: May 20, 2025
• Publicly Available Date: May 20, 2025
• Journal: Nature Communications
• Electronic ISSN: 2041-1723
• Publisher: Nature Research
• Peer Reviewed: Peer Reviewed
• Volume: 16
• Issue: 1
• Pages: 3501
• DOI: https://doi.org/10.1038/s41467-025-58792-5
• Public URL: https://durham-repository.worktribe.com/output/3795715