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| African monsoon | |
|---|---|
| Name | African monsoon |
| Region | Africa |
| Onset | seasonal |
| Retreat | seasonal |
African monsoon The African monsoon is a major seasonal climate system that governs rainfall, wind, and humidity across large portions of Africa, influencing Nile River, Lake Chad, Sahel, Sahara, West African coast, and Horn of Africa environments. It interacts with global systems such as the Intertropical Convergence Zone, Hadley cell, Atlantic Multidecadal Oscillation, El Niño–Southern Oscillation, Indian Ocean Dipole, and North Atlantic Oscillation, shaping livelihoods in cities like Lagos, Abidjan, Dakar, Kano, and Khartoum. Research institutions including NASA, European Space Agency, World Meteorological Organization, International Research Institute for Climate and Society, and African Union coordinate observations and policy responses related to monsoon variability.
The African monsoon encompasses seasonal shifts in wind and precipitation across West Africa, Central Africa, East Africa, and the Sahel, driven by the north–south migration of the Intertropical Convergence Zone and thermal contrasts between the Sahara and adjacent oceans. Major features include the West African Monsoon, the Southwest Indian Ocean monsoon influences on Madagascar and Mozambique, and the bimodal rainfall regime affecting the Horn of Africa and East African Rift. Historical records from the Mali Empire, Songhai Empire, Kingdom of Aksum, and colonial archives in France, United Kingdom, and Portugal document long-term monsoon impacts on trade corridors like the Trans-Saharan trade and port cities such as Timbuktu and Alexandria. Contemporary concerns involve food security in regions reliant on monsoon rains, as seen during crises linked to the Sahel droughts and the Horn of Africa famine.
Monsoon dynamics arise from interactions among land surface heating of the Sahara, sea-surface temperatures in the Gulf of Guinea and Tropical Atlantic Ocean, and large-scale atmospheric circulations like the Hadley cell and the Walker circulation. The northward displacement of the Intertropical Convergence Zone in boreal summer brings moist air from the Gulf of Guinea into continental interiors, modulated by the African Easterly Jet and the Tropical Easterly Jet. Feedbacks involve vegetation change in the Sahel and evapotranspiration from biomes such as the Guinean forest-savanna mosaic and the Congolian rainforest. Teleconnections link African monsoon variability to events associated with El Niño–Southern Oscillation phases recorded by NOAA and paleoclimate proxies from Lake Victoria, Lake Tanganyika, Lake Bosumtwi, and Lake Chad sediments.
West Africa features the pronounced West African Monsoon with a clear rainy season affecting capitals like Niamey and Ouagadougou, while Central Africa experiences year-round convection influenced by the Congo Basin and the Equatorial Atlantic. The Horn of Africa and East African Rift show bimodal rainfall with "long rains" and "short rains" tied to the Indian Ocean Dipole and cross-equatorial flow near Somalia and Ethiopia. Southern Africa’s austral summertime monsoon influences coastal regions including Mozambique and Madagascar, with cyclones originating in the Mozambique Channel modifying rainfall distributions. Mountain ranges such as the Ethiopian Highlands and the Cameroon line produce orographic enhancements that affect local hydrology in watersheds feeding the Blue Nile and the Volta River.
Interannual and decadal variability of the African monsoon is linked to El Niño–Southern Oscillation, the Atlantic Multidecadal Oscillation, anthropogenic forcing reported by the Intergovernmental Panel on Climate Change, and changes in aerosol emissions influenced by industrial centers in Europe and Asia. Paleoclimate evidence from the Holocene African Humid Period demonstrates large swings in monsoon intensity correlated with orbital forcing and orbital precession described in studies by institutions such as University of Oxford and Lamont–Doherty Earth Observatory. Recent trends documented by World Bank and United Nations Environment Programme indicate shifts in onset dates and spatial rainfall patterns that exacerbate droughts in the Sahel and floods in river basins like the Nile River and Jubba River.
Monsoon variability affects agriculture in regions cultivating sorghum, millet, and maize across countries including Nigeria, Mali, Sudan, Ethiopia, and Kenya, influencing food security and migration patterns tied to urban centers such as Cairo and Johannesburg. Infrastructure and health outcomes are impacted by monsoon-driven floods and vector-borne diseases recorded by agencies like World Health Organization and Médecins Sans Frontières. Ecosystems from the Sahel grasslands to the Congolian rainforest respond through shifts in phenology, desertification near the Sahara, and wetland dynamics in areas like the Sudd and Okavango Delta. International responses involve programs by Food and Agriculture Organization, International Committee of the Red Cross, and regional initiatives under the African Development Bank.
Observational networks utilize satellites from NASA missions such as Aqua and TRMM, ground networks coordinated by the World Meteorological Organization, and regional centers like the IGAD Climate Prediction and Applications Centre and the African Centre of Meteorological Applications for Development. Climate models from the Coupled Model Intercomparison Project and operational forecasts from agencies like NOAA and Met Office aim to predict monsoon onset and seasonal precipitation using data assimilation and ensemble approaches. Advances in machine learning by teams at Massachusetts Institute of Technology, Imperial College London, and University of Cape Town complement classical dynamical models to improve early warning systems for flood and drought management supported by United Nations Office for the Coordination of Humanitarian Affairs.