Paleoclimate change in Ethiopia around the last interglacial derived from annually-resolved stalagmite evidence

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Paleoclimate change in Ethiopia around the last interglacial derived from annually-resolved stalagmite evidence. / Asrat, Asfawossen; Baker, A; Leng, M; Hellstrom, John ; Mariethoz, G.; Boomer, Ian; Yu, D; Jex, CN; Gunn, J.

In: Quaternary Science Reviews, 15.12.2018.

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Asrat, Asfawossen ; Baker, A ; Leng, M ; Hellstrom, John ; Mariethoz, G. ; Boomer, Ian ; Yu, D ; Jex, CN ; Gunn, J. / Paleoclimate change in Ethiopia around the last interglacial derived from annually-resolved stalagmite evidence. In: Quaternary Science Reviews. 2018.

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@article{e3ef537c13b24375b9e7cf2c65c36a42,
title = "Paleoclimate change in Ethiopia around the last interglacial derived from annually-resolved stalagmite evidence",
abstract = "Oxygen and carbon (C) isotope, growth rate and trace element data are reported for a U-Th dated, annually-laminated stalagmite, GM1 from Goda Mea Cave, Ethiopia. The stalagmite grew intermittently around the last interglacial. The proxy records are used to develop a conceptual growth model of the stalagmite and to assess its potential for revealing a climate signal in this climatically sensitive northeastern African region during an important period in the evolution of Homo sapiens and dispersal of Anatomically Modern Humans out of Africa. Speleothem deposition is of short-duration occurring at ~129 ka, ~120 ka, in an undated growth phase, and at ~108 ka; probably due to tectonic activity. 18 composition is very stable within growth phases (1 variability < 0.76‰), as are Mg/Ca, Sr/Ca and Ba/Ca, all indicative of well-mixed source-waters. A shift to positive 18 values and increased variability in Mg/Ca, Sr/Ca and Ba/Ca prior to growth hiatuses is observed, indicating a loss of the well-mixed water source prior to growth cessation. Mean 18 composition (–3.82 to –7.77‰) is lower than published modern and Holocene stalagmites from the region. Geochemical data, statistical analyses, and a conceptual model of stalagmite growth, demonstrate that climatic conditions recorded by GM1 were wetter than the Holocene. The ~129 ka growth phase particularly presents an annual record of the relative Intertropical Convergence Zone (ITCZ) position. The GM1 record, the oldest high-resolution continental climate record from Ethiopia so far published, presents evidence that any early human migrations which occurred during MIS 5 are likely to have occurred during a wet event in northeast Africa.",
author = "Asfawossen Asrat and A Baker and M Leng and John Hellstrom and G. Mariethoz and Ian Boomer and D Yu and CN Jex and J Gunn",
year = "2018",
month = dec,
day = "15",
doi = "10.1016/j.quascirev.2018.06.016",
language = "English",
journal = "Quaternary Science Reviews",
issn = "0277-3791",
publisher = "Elsevier",

}

RIS

TY - JOUR

T1 - Paleoclimate change in Ethiopia around the last interglacial derived from annually-resolved stalagmite evidence

AU - Asrat, Asfawossen

AU - Baker, A

AU - Leng, M

AU - Hellstrom, John

AU - Mariethoz, G.

AU - Boomer, Ian

AU - Yu, D

AU - Jex, CN

AU - Gunn, J

PY - 2018/12/15

Y1 - 2018/12/15

N2 - Oxygen and carbon (C) isotope, growth rate and trace element data are reported for a U-Th dated, annually-laminated stalagmite, GM1 from Goda Mea Cave, Ethiopia. The stalagmite grew intermittently around the last interglacial. The proxy records are used to develop a conceptual growth model of the stalagmite and to assess its potential for revealing a climate signal in this climatically sensitive northeastern African region during an important period in the evolution of Homo sapiens and dispersal of Anatomically Modern Humans out of Africa. Speleothem deposition is of short-duration occurring at ~129 ka, ~120 ka, in an undated growth phase, and at ~108 ka; probably due to tectonic activity. 18 composition is very stable within growth phases (1 variability < 0.76‰), as are Mg/Ca, Sr/Ca and Ba/Ca, all indicative of well-mixed source-waters. A shift to positive 18 values and increased variability in Mg/Ca, Sr/Ca and Ba/Ca prior to growth hiatuses is observed, indicating a loss of the well-mixed water source prior to growth cessation. Mean 18 composition (–3.82 to –7.77‰) is lower than published modern and Holocene stalagmites from the region. Geochemical data, statistical analyses, and a conceptual model of stalagmite growth, demonstrate that climatic conditions recorded by GM1 were wetter than the Holocene. The ~129 ka growth phase particularly presents an annual record of the relative Intertropical Convergence Zone (ITCZ) position. The GM1 record, the oldest high-resolution continental climate record from Ethiopia so far published, presents evidence that any early human migrations which occurred during MIS 5 are likely to have occurred during a wet event in northeast Africa.

AB - Oxygen and carbon (C) isotope, growth rate and trace element data are reported for a U-Th dated, annually-laminated stalagmite, GM1 from Goda Mea Cave, Ethiopia. The stalagmite grew intermittently around the last interglacial. The proxy records are used to develop a conceptual growth model of the stalagmite and to assess its potential for revealing a climate signal in this climatically sensitive northeastern African region during an important period in the evolution of Homo sapiens and dispersal of Anatomically Modern Humans out of Africa. Speleothem deposition is of short-duration occurring at ~129 ka, ~120 ka, in an undated growth phase, and at ~108 ka; probably due to tectonic activity. 18 composition is very stable within growth phases (1 variability < 0.76‰), as are Mg/Ca, Sr/Ca and Ba/Ca, all indicative of well-mixed source-waters. A shift to positive 18 values and increased variability in Mg/Ca, Sr/Ca and Ba/Ca prior to growth hiatuses is observed, indicating a loss of the well-mixed water source prior to growth cessation. Mean 18 composition (–3.82 to –7.77‰) is lower than published modern and Holocene stalagmites from the region. Geochemical data, statistical analyses, and a conceptual model of stalagmite growth, demonstrate that climatic conditions recorded by GM1 were wetter than the Holocene. The ~129 ka growth phase particularly presents an annual record of the relative Intertropical Convergence Zone (ITCZ) position. The GM1 record, the oldest high-resolution continental climate record from Ethiopia so far published, presents evidence that any early human migrations which occurred during MIS 5 are likely to have occurred during a wet event in northeast Africa.

U2 - 10.1016/j.quascirev.2018.06.016

DO - 10.1016/j.quascirev.2018.06.016

M3 - Article

JO - Quaternary Science Reviews

JF - Quaternary Science Reviews

SN - 0277-3791

ER -