Climatic change recorded in the sediments of the Chew Bahir basin, southern Ethiopia, during the last 45,000 years

Foerster, Verena; Junginger, Annett; Langkamp, Oliver; Gebru, Tsige; Asrat, Asfawossen; Umer, Mohammed; Lamb, Henry F.; Wennrich, Volker; Rethemeyer, Janet; Nowaczyk, Norbert R; Trauth, Martin H.; Schaebitz, Frank

doi:10.1016/j.quaint.2012.06.028

Cited by 121 publications

(198 citation statements)

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“…Gradual, but progressively lower lake levels ensue from 8,000 to 7,500 years BP followed by an abrupt and severe regression associated with the termination of the African Humid Period (AHP) and onset of aridity after 7,000 years BP (Fig. 2(c); Foerster et al 2012). Brief pluvial events are recorded at 3,000 and~2,000-1,300 years BP (Fig.…”

Section: Paleoclimate Of Adjacent Basinsmentioning

confidence: 97%

“…Brief pluvial events are recorded at 3,000 and~2,000-1,300 years BP (Fig. 2(c); Foerster et al 2012).…”

Section: Paleoclimate Of Adjacent Basinsmentioning

confidence: 98%

“…1(d)) shows regressions in water levels from 12,800 to 11,600, 10,800 to 10,500, and 9,800 to 9,100 years BP (Fig. 2(c); Foerster et al 2012). Gradual, but progressively lower lake levels ensue from 8,000 to 7,500 years BP followed by an abrupt and severe regression associated with the termination of the African Humid Period (AHP) and onset of aridity after 7,000 years BP (Fig.…”

Section: Paleoclimate Of Adjacent Basinsmentioning

confidence: 99%

“…Estimated northernmost positions of the ITCZ during the AHP and present day adapted from Junginger et al (2014). a Gulf of Aden sediment core (Tierney and deMenocal 2013), b Indian Ocean sediment core (Bard et al 1997), c Paleolake Suguta (Garcin et al 2009;Junginger et al 2014), d Lake Chew Bahir (Foerster et al 2012), e Lake Ashenge (Marshall et al 2009), f Lake Tilo (Lamb et al 2000), g Lakes Ziway and Shala (Gillespie et al 1983), h Lake Tana (Costa et al 2014;Marshall et al 2011), i Lake Abbe (Gasse and Van Campo 1994), j Blue Nile sediment sources (Krom et al 2002) and k Lake Hayq (Lamb et al 2007) (image in full color online) and a permanent lowstand at Lake Abbe (a.k.a. Abhé; Fig.…”

Section: Paleoclimate Of Adjacent Basinsmentioning

confidence: 99%

“…2). Paleolakes Chalbi (Nyamweru 1989), Chew Bahir (Foerster et al 2012;Golubtsov and Habteselassie 2010;Grove et al 1975;Umer et al 2004), and Suguta (Garcin et al 2009;Garcin et al 2012;Junginger et al 2014) show concurrent desiccation, reflecting a change in local climate and a reduction in Omo River inflows. Later transgression phases inferred for Lake Turkana may have been part of a regional pluvial phase based on recharge of smaller water bodies in the southern Ethiopian Plateau (Lamb et al 2000;Umer et al 2004) and the northern Kenyan Highlands (Barker et al 2001;Butzer et al 1972;Hamilton 1982;Olago et al 2000).…”

Section: Archaeological Evidence Within the Context Of Regional Climamentioning

confidence: 99%

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Lakeside View: Sociocultural Responses to Changing Water Levels of Lake Turkana, Kenya

et al. 2015

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Throughout the Holocene, Lake Turkana has been subject to drastic changes in lake levels and the subsistence strategies people employ to survive in this hot and arid region. In this paper, we reconstruct the position of the lake during the Holocene within a paleoclimatic context. Atmospheric forcing mechanisms are discussed in order to contextualize the broader landscape changes occurring in eastern Africa over the last 12,000 years. The Holocene is divided into five primary phases according to changes in the strand-plain evolution, paleoclimate, and human subsistence strategies practiced within the basin. Early Holocene fishing settlements occurred adjacent to high and relatively stable lake levels. A period of high-magnitude oscillations in lake levels Afr Archaeol Rev (2015) ensued after 9,000 years BP and human settlements appear to have been located close to the margins of the lake. Aridification and a final regression in lake levels ensued after 5,000 years BP and human communities were generalized pastoralists-fishers-foragers. During the Late Holocene, lake levels may have dropped below their present position and subsistence strategies appear to have been flexible and occasionally specialized on animal pastoralism. Modern missionary and government outposts have encouraged the construction of permanent settlements in the region, which are heavily dependent on outside resources for their survival. Changes in the physical and cultural environments of the Lake Turkana region have been closely correlated, and understanding the relationship between the two variables remains a vital component of archaeological research.Résumé Tout l'Holocène, le lac Turkana a été soumis à des changements drastiques dans l'altitude des lacs et les stratégies de subsistance des gens utilisent pour survivre dans cette région chaude et aride. Dans cet article, nous reconstruisons la position du lac au cours de l'Holocène dans un contexte paléoclimatique. Mécanismes de forçage atmosphériques sont discutées afin de contextualiser les changements de paysage plus larges qui se produisent en Afrique orientale au cours des 12.000 dernières années. L'Holocène est divisé en cinq phases principales en fonction des changements dans l'évolution altitude du lac, paléoclimats et les stratégies de subsistance humains pratiqués dans le bassin. Premiers établissements de pêche de l'Holocène ont eu lieu à proximité d'altitude d'eau élevés et relativement stables. Une période d'oscillations de grande amplitude dans l'altitude du lac s'ensuit après 9000 années BP et les établissements humains semblent avoir été situé à proximité des marges sur le lac. Aridification et une régression finale du altitude des lacs s'ensuit après 5000 années BP et les communautés humaines sont généralisées éleveurs-pêcheurs-cueilleurs. Au cours de l'Holocène tardif, les altitudes des lacs pourraient avoir chuté en dessous de leur position actuelle et les stratégies de subsistance semblent avoir fait preuve de souplesse et de temps en temps spécialisé sur le pas...

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Section: Paleoclimate Of Adjacent Basinsmentioning

confidence: 97%

“…Brief pluvial events are recorded at 3,000 and~2,000-1,300 years BP (Fig. 2(c); Foerster et al 2012).…”

Section: Paleoclimate Of Adjacent Basinsmentioning

confidence: 98%

Section: Paleoclimate Of Adjacent Basinsmentioning

confidence: 99%

Section: Paleoclimate Of Adjacent Basinsmentioning

confidence: 99%

Section: Archaeological Evidence Within the Context Of Regional Climamentioning

confidence: 99%

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Lakeside View: Sociocultural Responses to Changing Water Levels of Lake Turkana, Kenya

et al. 2015

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The pace of East African monsoon evolution during the Holocene

Weldeab

Menke

Schmiedl

2014

Geophysical Research Letters

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African monsoon precipitation experienced a dramatic change in the course of the Holocene.The pace with which the African monsoon shifted from a strong early to middle to a weak late Holocene is critical for our understanding of climate dynamics, hydroclimate-vegetation interaction, and shifts of prehistoric human settlements, yet it is controversially debated. On the basis of planktonic foraminiferal Ba/Ca time series from the eastern Mediterranean Sea, here we present a proxy record of Nile River runoff that provides a spatially integrated measure of changes in East African monsoon (EAM) precipitation. The runoff record indicates a markedly gradual middle to late Holocene EAM transition that lasted over 3500 years. The timing and pace of runoff change parallels those of insolation and vegetation changes over the Nile basin, indicating orbitally forced variation of insolation as the main EAM forcing and the absence of a nonlinear precipitation-vegetation feedback. A tight correspondence between a threshold level of Nile River runoff and the timing of occupation/ abandonment of settlements suggests that along with climate changes in the eastern Sahara, the level of Nile River and intensity of summer floods were likely critical for the habitability of the Nile Valley (Egypt).

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A Half Century of Developments in Desert Geomorphology and the Place of A. T. Grove

Goudie

2019

Geography in Britain After World War II

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Climatic change recorded in the sediments of the Chew Bahir basin, southern Ethiopia, during the last 45,000 years

Cited by 121 publications

References 79 publications

Lakeside View: Sociocultural Responses to Changing Water Levels of Lake Turkana, Kenya

Lakeside View: Sociocultural Responses to Changing Water Levels of Lake Turkana, Kenya

The pace of East African monsoon evolution during the Holocene

A Half Century of Developments in Desert Geomorphology and the Place of A. T. Grove

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