Palaeoenvironmental Dynamics in Southern Africa
Summary
Southern Africa has witnessed complex environmental changes throughout the Late Quaternary, driven by interactions among orbital forcings, ocean–atmosphere circulations and regional feedbacks. Marine and terrestrial archives—including marine sediments off KwaZulu-Natal, peat cores from coastal wetlands and fossil pollen assemblages—reveal alternating humid and arid phases that correspond to glacial–interglacial cycles, millennial-scale cooling events and shifts in the Southern Hemisphere westerlies. Vegetation regimes have oscillated between forest, thicket, savanna and fynbos biomes in response to changes in the Agulhas Current, the position of the Intertropical Convergence Zone and the intensity of austral-summer versus winter rains. Fire, sea-surface temperatures, ice-sheet extent and subtropical high-pressure cells have each contributed to abrupt regime shifts, notably during the Medieval Warm Period and the Little Ice Age. These findings carry global significance by illustrating how regional climate modes modulate ecosystem resilience and by informing conservation strategies under twenty-first-century warming scenarios.
Research from Nature Portfolio
A foundational sediment-core study spanning 270,000 years from the southwest Indian Ocean employed high-resolution elemental ratios to reconstruct eastern South African hydroclimate. It demonstrates that precipitation variability aligns with orbital precession and abrupt high-latitude climate forcings, while numerical modelling links higher rainfall to enhanced local evaporation and moisture transport from Mozambique. This work establishes a long-term context for regional hydrological dynamics and highlights coherence with other Southern Hemisphere records while being anti-phased with monsoon systems elsewhere.
Palaeoenvironmental Dynamics in Southern Africa publication trend
The graph below shows the total number of articles in palaeoenvironmental dynamics in southern africa across all publications each year (not limited to Nature Index journals).
Technical terms
Palaeoenvironmental proxy: An indirect measure (e.g. pollen, elemental ratios) used to infer past environmental conditions.
Microcharcoal: Microscopic charcoal particles preserved in sediments, indicating past fire activity.
Precession: The cyclical wobble in Earth’s orbit (∼23,000-year period) affecting seasonal insolation.
Agulhas Current: A warm ocean current flowing southward along the east coast of southern Africa, influencing moisture transport.
Southern Hemisphere westerlies: Prevailing mid-latitude winds whose latitudinal shifts modulate precipitation in southern Africa.
References
- Eastern South African hydroclimate over the past 270,000 years. Scientific Reports (2015).
- Fire drives major Holocene vegetation shifts between subtropical and Mediterranean‐type ecosystems: a case study from a biodiversity hotspot in South Africa. Ecography (2024).
- Climate Change-Induced Decline in Succulent Euphorbia in Namibia’s Arid Regions. Plants (2025).
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