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| Tropical savanna climate | |
|---|---|
| Name | Tropical savanna climate |
| Code | Aw, As (Köppen) |
| Precipitation | Distinct wet and dry seasons |
| Temperature | High year-round |
| Vegetation | Savanna, grassland with scattered trees |
Tropical savanna climate is a climate type characterized by a pronounced seasonal contrast between wet and dry periods and generally high annual temperatures. It is classified within the Köppen system as Aw and As and occurs in broad belts across multiple continents, supporting iconic landscapes and human societies. Regions with this climate are notable in studies by institutions such as the International Panel on Climate Change and organizations like the World Meteorological Organization.
The Köppen classification designates the tropical savanna climate as Aw or As, distinguished from the Tropical monsoon climate and Tropical rainforest climate by having a dry season severe enough to limit tree cover; this classification appears in works by Wladimir Köppen and refinements used by the National Oceanic and Atmospheric Administration, Met Office, and NASA. Climatologists at the Hadley Centre and the Max Planck Institute for Meteorology analyze Aw/As zones when modeling land–atmosphere interactions in datasets from projects like CMIP and observational networks such as Global Precipitation Climatology Project. Paleoclimatologists reference savanna limits in reconstructions involving the Holocene and Pleistocene epochs.
Tropical savanna climates occur in extensive belts north and south of the equatorial rainforest zone across continents including Africa (e.g., the Sudan region, Sahel, Serengeti), South America (e.g., parts of Brazil such as the Cerrado and areas near Rio de Janeiro), Australia (e.g., the Top End and parts of Queensland like Brisbane hinterlands), and portions of India (e.g., the Deccan Plateau), Southeast Asia islands such as parts of Indonesia and Philippines, and areas in Central America and the Caribbean like Cuba and Haiti. National parks and protected areas such as Serengeti National Park, Kruger National Park, and Etosha National Park exemplify savanna landscapes within this climate.
Temperature profiles are typically warm to hot year-round, similar to climatological patterns recorded at stations like Nairobi, Dar es Salaam, Manaus, and Darwin. Precipitation shows strong seasonality driven by movements of the Intertropical Convergence Zone and subtropical high-pressure systems such as the Bermuda High and Azores High; monsoon dynamics involving the South Asian Monsoon and influences from the El Niño–Southern Oscillation modulate wet-season intensity. Dry-season conditions favor clear skies and elevated fire risk, influenced by atmospheric circulations studied at the European Centre for Medium-Range Weather Forecasts and documented in the Global Fire Emissions Database.
Vegetation comprises open grasslands with scattered trees and shrubs adapted to seasonal drought and fire regimes, exemplified by biomes like the Cerrado, Miombo woodlands, and Caatinga; iconic fauna include species of the Big Five within ecosystems documented in the IUCN Red List. Fire-adapted genera such as Acacia and Baobab occur alongside grasses like Sorghum relatives and native bunchgrasses studied by botanists at institutions like the Royal Botanic Gardens, Kew and the Smithsonian Institution. Conservation programs led by organizations including WWF and Conservation International focus on savanna biodiversity and corridors linking protected areas such as Serengeti National Park and Masai Mara.
Human societies in savanna regions include communities in countries such as Kenya, Tanzania, Nigeria, India, and Brazil engaging in pastoralism, agroforestry, and cultivation of crops like millet, sorghum, and cassava; urban centers including Lagos, Accra, Mumbai, and Belo Horizonte expand into surrounding savannas. Land use changes driven by agriculture, ranching, and infrastructure projects associated with agencies like the World Bank and national ministries have caused fragmentation studied in reports by UNEP and the Food and Agriculture Organization. Fire management, grazing regimes, and invasive species interventions are implemented by local governments and NGOs including African Parks and The Nature Conservancy.
Interannual variability is linked to phenomena such as El Niño–Southern Oscillation, Indian Ocean Dipole, and shifts in the Hadley circulation, affecting rainfall timing and totals recorded at climate observatories like PAGO and networks operated by NOAA. Climate change projections from IPCC scenarios indicate shifts in season length, increases in drought frequency, and altered fire regimes with impacts modeled by research groups at Columbia University’s Lamont–Doherty Earth Observatory and the University of Oxford. Socioeconomic consequences affect food security and migration patterns documented by agencies like UNHCR and IFPRI, while mitigation and adaptation strategies are pursued through programs under the UN Framework Convention on Climate Change and national adaptation plans of countries such as Brazil and South Africa.
Category:Climates