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| Climate of Africa | |
|---|---|
| Name | Climate of Africa |
| Continent | Africa |
| Major regions | Sahara Desert, Sahel, Horn of Africa, Horn of Africa, West Africa, Central Africa, East Africa, Southern Africa |
| Climate types | Tropical rainforest climate, Savanna, Desert, Mediterranean climate, Humid subtropical climate |
| Notable features | Intertropical Convergence Zone, El Niño–Southern Oscillation, Benguela Current, Gulf Stream, Green Sahara |
Climate of Africa covers the spatially diverse atmospheric conditions that define Sahara Desert, Sahel, Congo Basin, Kalahari Desert, and coastal zones from Mediterranean Sea shores to Indian Ocean islands. The continent's climate results from interactions among the Intertropical Convergence Zone, terrestrial surface types such as the Sahara Desert and Namib Desert, and large-scale systems including the El Niño–Southern Oscillation, Atlantic Multidecadal Oscillation, and monsoon flows tied to the Indian Ocean Dipole. Human history in regions like Nile Delta, Sahel, and Great Rift Valley has been shaped by these climatic patterns.
Africa's climate spans Tropical rainforest climate, Savanna, Desert, and temperate regimes such as the Mediterranean climate of Maghreb and Cape Province. The continent sits across the equator and between the Prime Meridian and International Date Line, exposing it to the migrating Intertropical Convergence Zone and seasonal shifts linked to the African monsoon and circulations influenced by the North Atlantic Oscillation and Southern Annular Mode. Historical episodes like the Green Sahara and paleoclimatic events recorded at Lake Chad and Lake Victoria illustrate past variability that affected societies such as those in Ancient Egypt and the Kingdom of Aksum.
Major climate zones include equatorial wet forests in the Congo Basin and Gulf of Guinea, seasonal Savanna across West Africa and East Africa, arid belts of the Sahara Desert and Namib Desert, and Mediterranean climates in Northern Africa and Cape Town. Orographic effects from ranges like the Atlas Mountains, Ethiopian Highlands, and Drakensberg create rain shadows and localized climates affecting river systems such as the Nile River and Zambezi River. Island climates on Madagascar, Seychelles, and Mauritius reflect maritime influences from the Mozambique Channel and Indian Ocean.
The Intertropical Convergence Zone governs convection and rainfall across equatorial Africa, while the Benguela Current off Namibia and South Africa induces coastal upwelling and aridity. The El Niño–Southern Oscillation modulates precipitation and temperature anomalies impacting regions from the Horn of Africa to Southern Africa, and the Atlantic Multidecadal Oscillation influences decadal variability in Sahel rainfall. Teleconnections with the Mediterranean Sea and drivers such as the Indian Ocean Dipole alter monsoon onset affecting areas like Somalia, Kenya, and Mozambique.
Rainfall regimes vary: bimodal rains around the equator (e.g., Kibale National Park region near Lake Victoria), single wet seasons in much of West Africa and Southern Africa, and hyper-arid conditions in the Sahara Desert and Atacama Desert analogues on the continent. The timing of the West African monsoon affects countries including Nigeria, Mali, and Senegal, while the East African short rains and long rains influence agricultural calendars in Ethiopia and Tanzania. Flooding in the Nile Delta, seasonal inundation of the Okavango Delta, and drought cycles in the Sahel link directly to seasonal shifts.
Temperature gradients span from the scorching record highs of the Sahara Desert to alpine cold on Mount Kilimanjaro and the Ethiopian Highlands. Long-term instrumental records and proxy archives from Lake Tanganyika and Lake Malawi document warming trends consistent with global patterns described by the Intergovernmental Panel on Climate Change. Heatwaves and urban warming in cities such as Cairo, Lagos, and Johannesburg compound stress on infrastructure and public health, with observed shifts in seasonality across regions like Morocco and South Africa.
Climatic gradients underpin biodiversity hotspots such as Madagascar, the Eastern Afromontane, and the Guinean Forests of West Africa, supporting endemic species like lemurs and montane plants. Changes in precipitation and fire regimes affect savanna–forest mosaics, influencing fauna across Serengeti National Park, Kruger National Park, and the Okavango Delta. Coral reefs off Mozambique and Seychelles are sensitive to sea-surface temperature rise and acidification linked to oceanic changes, threatening marine biodiversity and fisheries vital to coastal communities like those in Zanzibar.
Agriculture in the Nile Delta, Ethiopian Highlands, and Sahel depends on predictable rainfall; disruptions affect staples in Nigeria, Ethiopia, and Sudan and drive migration toward urban centers such as Cairo and Kinshasa. Water resources in transboundary basins like the Nile River and Zambezi River intersect geopolitics involving states such as Egypt, Ethiopia, and South Africa and institutions including the African Union and African Development Bank. Climate-linked risks to infrastructure and health systems in megacities like Lagos, Nairobi, and Dar es Salaam have economic implications for sectors tied to commodities exported through ports like Durban and Alexandria.
Climate models assessed by the Intergovernmental Panel on Climate Change project increased temperatures across Africa, altered precipitation patterns for the Sahel and Horn of Africa, and sea-level rise threatening deltas including Nile Delta and Gulf of Guinea coasts. Scenarios developed in coordination with organizations such as the United Nations Framework Convention on Climate Change and programs by the World Bank and United Nations Environment Programme explore adaptation pathways for agriculture, water management, and urban resilience in places like Addis Ababa and Rabat. Policy responses range from regional initiatives under the African Union to national plans tied to Paris Agreement commitments and local adaptation projects in communities across Madagascar, Somalia, and Mozambique.