Wikipedia

Sahel

(Redirected from Sahel climate)
For other uses, see Sahel (disambiguation).
Not to be confused with Sahul.

The Sahel region (/səˈhɛl/; from Arabic ساحل (sāḥil [ˈsaːħil]) 'coast, shore'), or Sahelian acacia savanna, is a biogeographical region in Africa. It is the transition zone between the more humid Sudanian savannas to its south and the drier Sahara to the north. The Sahel has a hot semi-arid climate and stretches across the southernmost latitudes of North Africa between the Atlantic Ocean and the Red Sea. Although geographically located in the tropics, the Sahel does not have a tropical climate.

Sahel
Throughout the Sahel, rammed earth construction is widespread, as exemplified by this medieval mosque in Burkina Faso
Sahel savanna and its namesake acacias at the beginning of the short summer rainy season
The Sahel region in Africa: a belt up to 1,000 km (620 mi) wide that spans 5,400 km (3,360 mi) from the Atlantic Ocean to the Red Sea
Ecology
RealmAfrotropical
BiomeTropical and subtropical grasslands, savannas, and shrublands
Borders
List
AnimalsCamels, horses
Bird speciesMigratory birds
Mammal speciesOryx, Gazelles, African buffalo
Geography
Area3,053,200 km2 (1,178,800 sq mi)
Countries
List
Elevation200 and 400 meters (660 and 1,310 ft)
RiversSenegal, Niger, Nile
Climate typeTropical savanna climates (Aw), Hot Semi-arid (BSh), Hot Desert (BWh)

Especially in the western Sahel, there are frequent shortages of food and water due to its very high government corruption and the semi-arid climate. This is exacerbated by very high birthrates across the region, resulting in a rapid increase in population. In recent times,[when?] various coups, insurgencies, terrorism[1] and foreign interventions have taken place in many Sahel countries, especially across former Françafrique.

Geography

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The lush green of the Sahelian acacia savanna during the rainy summer season in Mali. Note the large baobab amongst the acacia.
 
Herders with livestock and azawakh dogs in the Sahel

The Sahel spans 5,900 km (3,670 mi) from the Atlantic Ocean in the west to the Red Sea in the east, in a belt several hundred to a thousand kilometers (c. 600 miles) wide. It covers an area of 3,053,200 square kilometers (1,178,850 sq mi).

Representing a climatic and ecological transition zone with hot semi-desert and steppe conditions, the Sahel region borders the more humid Sudanian savannas to its south and the dry Sahara desert to the north. This ecoregion is also called the Sahelian Acacia savanna in honour of its most prominent and very drought tolerant genus of tree.[2]

The topography of the Sahel is mainly flat; most of the region lies between 200 and 400 meters (660 and 1,310 ft) in elevation. Several isolated plateaus and mountain ranges rise from the Sahel (e.g. Marrah Mountains, Aïr Mountains, Ennedi Plateau), but are designated as separate ecoregions because their flora and fauna are distinct from the surrounding lowlands (e.g. East Saharan woodlands). Annual rainfall varies from around 100–200 mm (4–8 in) in the north of the Sahel to around 700–1,000 mm (28–39 in) in the south.[2]

Flora and fauna

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The Sahel is mostly covered in grassland and savanna, with areas of woodland and shrubland. Grass cover is fairly continuous across the region, dominated by annual grass species such as Cenchrus biflorus, Schoenefeldia gracilis and Aristida stipoides. Species of acacia are the dominant trees, with Acacia tortilis the most common, along with Senegalia senegal and Senegalia laeta. Other tree species include Adansonia digitata, Commiphora africana, Balanites aegyptiaca, Faidherbia albida, Borassus aethiopum, Vitellaria paradoxa, Olea europaea, Arbutus unedo, Phoenix canariensis, Hyphaene compressa, Cupressus sempervirens, Quercus coccifera, Quercus suber, Pinus nigra, Populus nigra, Ceratonia siliqua, Salix alba, Afzelia africana, Kigelia africana, Sclerocarya birrea, and Boscia senegalensis. In the northern part of the Sahel, areas of desert shrub, including Panicum turgidum and Aristida sieberiana, alternate with areas of grassland and savanna. During the long dry season, many trees lose their leaves and the predominantly annual grasses die.

The Sahel was formerly home to large populations of grazing mammals, including the scimitar-horned oryx (Oryx dammah), dama gazelle (Gazella dama), Dorcas gazelle (Gazella dorcas), red-fronted gazelle (Gazella rufifrons), the giant prehistoric buffalo (Pelorovis), and Bubal hartebeest (Alcelaphus buselaphus buselaphus), along with large predators, such as the African wild dog (Lycaon pictus), the Northwest African cheetah (Acinonyx jubatus hecki), the Northeast African cheetah (Acinonyx jubatus soemmeringii), and the lion (Panthera leo). The larger species have been greatly reduced in number by over-hunting and competition with livestock, and several species are vulnerable (Dorcas gazelle, cheetah, lion and red-fronted gazelle), endangered (Dama gazelle and African wild dog), or extinct (the Scimitar-horned oryx is probably extinct in the wild, and both Pelorovis and the Bubal hartebeest are now extinct).

The seasonal wetlands of the Sahel are important for migratory birds moving within Africa and on the African-Eurasian flyways.[2]

Climate

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Ennedi Plateau is located at the border of the Sahara and the Sahel
 
10 year average precipitation during the summer rainy season (May - September) in the Sahel and adjacent regions

The Sahel has a tropical semi-arid climate (Köppen climate classification BSh). The climate is typically hot, sunny, dry and somewhat windy all year long. The Sahel's climate is similar to, but less extreme than, the climate of the Sahara desert located just to the north.

The Sahel mainly receives a low to very low amount of precipitation annually. The steppe has a very long, prevailing dry season and a short rainy season. The precipitation is also extremely irregular, and varies considerably from season to season. Most of the rain usually falls during four to six months in the middle of the year, while the other months may remain absolutely dry. The interior of the Sahel region generally receives between 200 mm and 700 mm of rain yearly. A system of subdivisions often adopted for the Sahelian climate based on annual rainfall is as follows: the Saharan-Sahelian climate, with mean annual precipitation between around 100 and 200 mm (such as Khartoum, Sudan), the strict Sahelian climate, with mean annual precipitation between around 200 and 700 mm (such as Niamey, Niger) and the Sahelian-Sudanese climate, with mean annual precipitation between around 700 and 900 mm (such as Ouagadougou, Burkina Faso). The relative humidity in the steppe is low to very low, often between 10% and 25% during the dry season and between 25% and 75% during the rainy season. The least humid places have a relative humidity under 35%.[citation needed]

The Sahel is characterized by constant, intense heat, with an unvarying temperature. The Sahel rarely experiences cold temperatures. During the hottest period, the average high temperatures are generally between 36 and 42 °C (97 and 108 °F) (and even more in the hottest regions), often for more than three months, while the average low temperatures are around 25 to 31 °C (77 to 88 °F). During the "coldest period", the average high temperatures are between 27 and 33 °C (81 and 91 °F) and the average low temperatures are between 15 and 21 °C (59 and 70 °F).[3] Everywhere in the Sahel, the average mean temperature is over 18 °C (64 °F).

The Sahel has a high to very high sunshine duration year-round, between 2,400 hours (about 55% of the daylight hours) and 3,600 hours (more than 80% of the daylight hours). The sunshine duration in the Sahel approaches desert levels, and is comparable to that in the Arabian Desert, for example, even though the Sahel is only a steppe and not a desert. The cloud cover is low to very low. For example, Niamey, Niger has 3,082 hours of bright sunshine; Gao, Mali has near 3,385 hours of sunshine; Timbuktu, Mali has 3,409 sunny hours, and N'Djamena, Chad has 3,205 hours of sunlight.[4][5][6][7]

Recent droughts

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Further information: Sahel drought

For hundreds of years, the Sahel region has experienced frequent droughts and megadroughts. One megadrought lasted from 1450 to 1700, 250 years.[8] There was a major drought in the Sahel in 1914 caused by annual rains far below average, leading to large-scale famine. From 1951 to 2004, the Sahel experienced some of the most consistent and severe droughts in Africa.[9] The 1960s saw a large increase in rainfall in the region, making the northern drier region more accessible. There was a push, supported by governments, for people to move northwards. When the long drought period from 1968 through 1974 began, grazing quickly became unsustainable and large-scale denuding of the terrain followed. Like the drought in 1914, this led to a large-scale famine, but this time somewhat tempered by international visibility and an outpouring of aid. This catastrophe led to the founding of the International Fund for Agricultural Development.

2010 drought

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Main article: 2010 Sahel famine

Between June and August 2010, famine struck the Sahel.[10] Niger's crops failed to mature in the heat, 350,000 faced starvation, and 1,200,000 were at risk of famine.[11] In Chad the temperature reached 47.6 °C (117.7 °F) on 22 June in Faya-Largeau, breaking a record set in 1961 at the same location. Niger tied its highest temperature record set in 1998, also on 22 June, at 47.1 °C in Bilma. That record was broken the next day, when Bilma hit 48.2 °C (118.8 °F). The hottest temperature recorded in Sudan was reached on 25 June, at 49.6 °C (121.3 °F) in Dongola, breaking a record set in 1987.[12] Niger reported on 14 July that diarrhoea, starvation, gastroenteritis, malnutrition and respiratory diseases had sickened or killed many children. The new military junta appealed for international food aid and took serious steps to call on overseas help.[13] On 26 July, the heat reached near-record levels over Chad and Niger,[14] and in northern Niger about 20 people reportedly died of dehydration by 27 July.[citation needed]

Desertification and soil loss

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Camels at a watering hole in the semi-arid Sahel in Chad

The Sahel region faces environmental issues that are contributing to global warming. If the change in climate in the Sahel region "is not slowed-down and desertification possibly reversed through sustainable practices and any form of reforestation, it is only a matter of time before countries like Niger lose their entire landmass to desert due to unchecked unsustainable human practices.[15]: 9  Over-farming, over-grazing, over-population of marginal lands, and natural soil erosion, have caused serious desertification of the region.[16][17] This has affected shelter construction, making it necessary to change the used materials. The Woodless Construction project was introduced in Sahel in 1980 by the Development Workshop, achieving since then a high social impact in the region.[18] A major initiative to combat desertification in the Sahel region via reforestation and other interventions is the Great Green Wall.

Major dust storms are a frequent occurrence as well. During November 2004, a number of major dust storms hit Chad, originating in the Bodélé Depression.[19] This is a common area for dust storms, occurring on average on 100 days every year.[20]

 
Sahel region of Mali

On 23 March 2010, a major sandstorm hit Mauritania, Senegal, The Gambia, Guinea-Bissau, Guinea, and inland Sierra Leone. Another struck in southern Algeria, inland Mauritania, Mali and northern Ivory Coast[21] at the same time.

Following the drought period of the 1970s and 1980, however, the Sahel began to experience increased rainfall.[22] This may be due to global warming, which can cause changes that may result in changes in large-scale weather patterns, such as increased stronger monsoons, in turn caused by a warmer Atlantic Ocean.[23] Warming of the Mediterranean Sea may also be a factor.[24]

Protected areas

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Protected areas in the Sahel include Ferlo Nord Wildlife Reserve in Senegal, Sylvo-Pastoral and Partial Faunal Reserve of the Sahel in Burkina Faso, Ansonga-Ménake Faunal Reserve in Mali, Tadres Reserve in Niger, and Waza National Park in Cameroon.[25]

Culture

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Fulani herders in Mali

Traditionally, most of the people in the Sahel have been semi-nomads, farming and raising livestock in a system of transhumance. The difference between the dry North with higher levels of soil nutrients and the wetter South with more vegetation, is utilized by having the herds graze on high-quality feed in the North during the wet season, and trek several hundred kilometers to the South to graze on more abundant, but less nutritious feed during the dry period.[citation needed]

In Western Sahel, polygamy and child marriage are common.[26] Female genital mutilation is also practiced across the Sahel.[26][27]

Etymology

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The term "Sahel" is borrowed from the Arabic name for the region, الساحل al-sāḥil. Sāḥil literally means "coast, shore",[28] which has been explained as a figurative reference to the southern edge of the vast Sahara.[29][30] However, such use is unattested in Classical Arabic, and it has been suggested that the word may originally have been derived from the Arabic word سهل sahl "plain" instead.[31]

History

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Early agriculture

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Around 4000 BC, the climate of the Sahara and the Sahel started to become drier at an exceedingly fast pace. This climate change caused lakes and rivers to shrink significantly and caused increasing desertification. This, in turn, decreased the amount of land conducive to settlements and caused migrations of farming communities to the more humid climate of West Africa.[32]

Sahelian kingdoms

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Main article: Sahelian kingdoms
Further information: Trans-Saharan trade and Islamization of the Sudan region
 
1905 depiction of ethnic groups in the Sahel

The Sahelian kingdoms were a series of monarchies centered in the Sahel between the 9th and 18th centuries. The wealth of the states, like the legendary Mali Empire at the time of Mansa Musa, came from controlling the trans-Saharan trade routes across the desert, especially with the Maghreb. Their power came from having large pack animals like camels and horses that were fast enough to keep a large empire under central control and were also useful in battle. All of these empires were quite decentralized with member cities having a great deal of autonomy.[citation needed]

The larger Sahelian kingdoms emerged from 750 AD and erected several large cities in the Niger valley region, including Timbuktu, Gao and Djenné.[33]

Due to the wooded areas to their south, the Sahelian states were hindered from expanding into the north Akan state of the Bonoman and Yoruba peoples, as mounted warriors were all but useless in the forests. In addition, the horses and camels were susceptible to the humidity and diseases of the tropics.[34]

Colonial period

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The Western Sahel fell to France in the late 19th century as part of French West Africa.[35] Chad was added in 1900 as part of French Equatorial Africa. The French territories in the Sahel were decolonized in 1960.[36]

The Sahel's easternmost region did not fall to the European powers but to the Khedivate of Egypt when it was conquered by Muhammad Ali in the 1820s. By 1899 it came under British rule until granted independence at Egypt's behest in 1956.[37][38][39]

Instability and violence

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Terrorism

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See also: List of Islamist terrorist attacks

According to The Economist, in recent years the Sahel has become the epicenter of terrorist violence, contributing to 35% of all global deaths from terrorism by 2021, with Jama’at Nasr al-Islam wal Muslimin, an al-Qaeda-affiliated group, identified as the world's fastest-growing terrorist organization.[1] In 2023, fatalities from conflict in the central Sahel rose by 38%, according to data from the research organization Armed Conflict Location and Event Data Project.[40]

In the wake of the Libyan Crisis beginning in 2011,[41] terrorist organizations operating in the Sahel, including Boko Haram, Islamic State and al-Qaeda in the Islamic Maghreb (AQIM), have greatly exacerbated the violence, extremism and instability of the region.[42][43] In March 2020, the United States sent a special envoy for the Sahel region to combat the rising violence from terrorist groups.[44] The Catholic charity Aid to the Church in Need has highlighted the fact that the Sahel has become one of the most dangerous regions in the world for Christians.[45]

As of 2024, a wave of new military juntas in Africa, favoring Russian mercenaries over Western forces and UN peacekeepers, has intensified violence. This led Mauritania and Chad to disband the G5 Sahel, an anti-terrorism alliance, after the military regimes in Burkina Faso, Niger, and Mali withdrew.[40]

Human rights issues and political instability

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On 9 July 2020, the United States raised concerns over growing number of allegations of human rights violations and abuses by state security forces in Sahel.[46] The US response came after Human Rights Watch released documents regarding the same on 1 July.[47] Reports in March 2022 show militants are expanding and spreading out south of the Sahel.[48]

The area has also seen a high prevalence of coups d'état, with military juntas currently ruling in Mali, Burkina Faso, Niger, Chad, and Sudan.

Other challenges

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Movement of nomads in Chad

The violent herder–farmer conflicts in Nigeria, Mali, Sudan and other countries in the Sahel region have been exacerbated by climate change, land degradation, and rapid population growth.[49][50][51] Droughts and food shortages have been also linked to the Mali War.[52][53]

The Sahel is experiencing more severe weather due to climate change, exemplified by the extreme heatwave of March-April 2024 in Burkina Faso and Mali. This event was intensified by a 1.2°C global temperature increase from human activities.[54]

See also

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References

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  1. ^ a b "The world's centre of terrorism has shifted to the Sahel". The Economist. ISSN 0013-0613. Retrieved 29 November 2023.
  2. ^ a b c "Sahelian Acacia savanna". Terrestrial Ecoregions. World Wildlife Fund. Retrieved 7 December 2009.
  3. ^ Change, NASA Global Climate. "Global Surface Temperature | NASA Global Climate Change". Climate Change: Vital Signs of the Planet. Retrieved 26 August 2022.
  4. ^ "Niamey Climate Niamey Temperatures Niamey Weather Averages". www.niamey.climatemps.com.
  5. ^ "Timbuktu Climate Timbuktu Temperatures Timbuktu Weather Averages". www.timbuktu.climatemps.com.
  6. ^ "Gao Climate Gao Temperatures Gao Weather Averages". www.gao.climatemps.com.
  7. ^ "N'Djamena Climate N'Djamena Temperatures N'Djamena Weather Averages". www.n-djamena.climatemps.com.
  8. ^ Brahic, Catherine. "Africa trapped in mega-drought cycle". New Scientist. Retrieved 17 December 2012.
  9. ^ Scholl, Adam. "Map Room: Hidden Waters". World Policy Journal. Retrieved 17 December 2012.
  10. ^ "Drought threatens African humanitarian crisis – Channel 4 News". Channel4.com. 1 July 2010. Retrieved 28 July 2010.
  11. ^ Foy, Henry (21 June 2010). "Millions face starvation in west Africa, warn aid agencies". The Guardian. London.
  12. ^ Masters, Jeff. "NOAA: June 2010 the globe's 4th consecutive warmest month on record". Weather Underground. Jeff Masters' WonderBlog. Archived from the original on 19 July 2010. Retrieved 21 July 2010.
  13. ^ "Niger: famine on the horizon?". France 24. 14 July 2010. Retrieved 25 October 2012.
  14. ^ "wonder Blog: Weather Underground". Wonder-ground.com. Archived from the original on 27 June 2010. Retrieved 28 July 2010.
  15. ^ Orioha, M. K. (2018). "Managing Climate Reality in Sub-Sahara Africa" (PDF). Morganorioha.com. Retrieved 19 January 2019.
  16. ^ "Causes and Effects of Desertification". Archived from the original on 2 December 2013. Retrieved 19 June 2010.
  17. ^ Schmidt, Laurie J. (18 May 2001). "From the Dust Bowl to the Sahel". NASA.
  18. ^ "Training and employment of locals. [Social Impact]. WConstruction. The promotion of Woodless Construction in West Africa (1980–2017)". SIOR, Social Impact Open Repository.
  19. ^ "Dust Storm in the Bodele Depression". NASA. December 2004. Retrieved 19 June 2010.
  20. ^ Di Liberto, John (13 July 2018). "Dust from the Sahara Desert stretches across the tropical Atlantic Ocean in late June/early July 2018". climate.gov. Archived from the original on 2 August 2023. Retrieved 26 February 2024.
  21. ^ "Earth Snapshot • Sand Storm". Archived from the original on 29 April 2011. Retrieved 18 June 2010.
  22. ^ "Re-Greening of the Sahel". Columbia University. Retrieved 27 October 2024.
  23. ^ Pausata, Francesco S.R. (March 2020). "The Greening of the Sahara: Past Changes and Future Implications". One Earth. 2 (3): 235–250. Bibcode:2020OEart...2..235P. doi:10.1016/j.oneear.2020.03.002. Retrieved 26 October 2024.
  24. ^ Biasutti, Michela (27 June 2016). "What brings rain to the Sahel?". Nature Climate Change. 6 (10): 897–898. doi:10.1038/nclimate3080. Retrieved 26 October 2024.
  25. ^ "SERIES 2 | Rising tensions in the Sahel". The Informant247. 7 February 2022. Retrieved 16 February 2022.
  26. ^ a b "Archived copy" (PDF). Retrieved 5 June 2017.
  27. ^ "UNICEF West and Central Africa". www.unicef.org.
  28. ^ "Definition grid different of Sahel (British and World English)". Oxford Dictionaries. Archived from the original on 3 August 2012. Retrieved 10 October 2015.
  29. ^ A System of Modern Geography. E. Huntington & Co. 1834. pp. 287. sahara ocean of sand.
  30. ^ "Sahel dictionary definition – Sahel defined". www.yourdictionary.com. Retrieved 30 August 2020.
  31. ^ Marcel, Jean Jacques (1837). Vocabulaire Français-Arabe des dialectes vulgaires Africains; D'Alger, de Tunis, de Marok et d'Égypte (in Arabic). Hingray.
  32. ^ O'Brien, Patrick K., ed. (2005). Oxford Atlas of World History. New York: Oxford University Press. pp. 22–23.
  33. ^ Chirikure, Shadreck (26 February 2018), "Precolonial Metallurgy and Mining across Africa", Oxford Research Encyclopedia of African History, doi:10.1093/acrefore/9780190277734.013.148, ISBN 978-0-19-027773-4
  34. ^ Hunwick, John O. (1 January 2003). Timbuktu and the Songhay Empire: Al-Saʿdi's Taʾrīkh Al-Sūdān Down to 1613, and Other Contemporary Documents. BRILL. ISBN 978-90-04-12822-4.
  35. ^ De Leon, Daniel (1886). "The Conference at Berlin on the West-African Question". Political Science Quarterly. 1 (1): 103–139. doi:10.2307/2139304. ISSN 0032-3195. JSTOR 2139304.
  36. ^ Chafer, Tony (2005). "Chirac and 'la Françafrique': No Longer a Family Affair". Modern & Contemporary France. 13: 7–23. doi:10.1080/0963948052000341196. Since political independence, France has maintained a privileged sphere of influence—the so-called 'pré carré'—in sub-Saharan Africa, based on a series of family-like ties with its former colonies.
  37. ^ Lahav, Pnina (1 July 2015). "The Suez Crisis of 1956 and Its Aftermath: A Comparative Study of Constitutions, Use of Force, Diplomacy and International Relations". Boston University Law Review. 95 (4): 1297. Archived from the original on 19 March 2020.
  38. ^ Frankema, Ewout; Williamson, Jeffrey; Woltjer, Pieter (12 August 2017). "An Economic Rationale for the West African Scramble? The Commercial Transition and the Commodity Price Boom of 1835–1885" (PDF). Journal of Economic History: 231–267. Archived (PDF) from the original on 21 March 2020.
  39. ^ Crowe, Sibyl; Crowe, Sibyl (1970). The Berlin West African Conference, 1884 - 1885 (Reprint [der Ausg.] New York 1942 ed.). Westport, Conn: Negro Univ. Press. ISBN 978-0-8371-3287-7.
  40. ^ a b "Mauritania is a beacon of stability in the coup-prone Sahel". The Economist. ISSN 0013-0613. Retrieved 10 August 2024.
  41. ^ "Violent Extremism in the Sahel". Council on Foreign Relations. Retrieved 16 August 2023.
  42. ^ "Sahel". Crisis Group. Retrieved 23 June 2019.
  43. ^ "Violent Extremism in the Sahel". CSIS.
  44. ^ "U.S. creates new envoy position to counter rising terrorism in Sahel". Reuters. 6 March 2020. Retrieved 11 March 2020.
  45. ^ ACN (8 February 2024). "Sahel: ACN comes to the aid of Christians displaced by terror". ACN International. Retrieved 26 April 2024.
  46. ^ "Allegations of Human Rights Violations and Abuses in the Sahel". U.S. Embassy in Mauritania. Retrieved 9 July 2020.
  47. ^ "Sahel: Atrocities by the security forces are fueling recruitment by armed Islamists". Human Rights Watch. July 2020. Retrieved 1 July 2020.
  48. ^ Phillips, Michael M. (2 March 2022). "Militants Are Edging South Toward West Africa's Most Stable and Prosperous States". The Wall Street Journal.
  49. ^ Nugent, Ciara (28 June 2018). "How Climate Change Is Spurring Land Conflict in Nigeria". Time.
  50. ^ "The battle on the frontline of climate change in Mali". BBC News. 22 January 2019.
  51. ^ "Farmer-Herder Conflicts on the Rise in Africa". ReliefWeb. 6 August 2018.
  52. ^ "The Sahel in flames". The New Humanitarian. 31 May 2019. Retrieved 23 June 2019.
  53. ^ Arsenault, Chris (27 April 2015). "Climate change, food shortages, and conflict in Mali". Al-Jazeera.
  54. ^ "Africa's Sahel Can Expect More Deadly Heat Waves, Study Shows". Bloomberg.com. 18 April 2024. Retrieved 18 April 2024.

Sources

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Further reading

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