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We used a change point analysis on a late Pleistocene–Holocene lake-sediment record from the Chew Bahir basin in the southern Ethiopian Rift to determine the amplitude and duration of past climate transitions. The most dramatic changes occurred over 240 yr (from ~15,700 to 15,460 yr) during the onset of the African Humid Period (AHP), and over 990 yr (from ~4875 to 3885 yr) during its protracted termination. The AHP was interrupted by a distinct dry period coinciding with the high-latitude Younger Dryas stadial, which had an abrupt onset (less than ~100 yr) at ~13,260 yr and lasted until ~11,730 yr. Wet-dry-wet transitions prior to the AHP may reflect the high-latitude Dansgaard-Oeschger cycles, as indicated by cross-correlation of the potassium record with the NorthGRIP ice core record between ~45–20 ka. These findings may contribute to the debates regarding the amplitude, and duration and mechanisms of past climate transitions, and their possible influence on the development of early modern human cultures.
|Number of pages||10|
|Early online date||11 Jun 2018|
|Publication status||Published - 01 Sept 2018|
- African Humid Period
- Change point analysis
- Dansgaard-Oeschger cycles
- Late Pleistocene
- Principal component analysis
- Southern Ethiopian Rift
- Younger Dryas
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- Faculty of Earth and Life Sciences, Department of Geography and Earth Sciences - Emeritus Professor
- 1 Finished
A 500,000- year environmental record from Chew Bahir, south Ethiopia: testing hypotheses of climate- driven human evolution, innovation and dispersal
Lamb, H., Davies, S., Grove, M., Pearson, E. & Roberts, H.
Natural Environment Research Council
01 Oct 2014 → 30 Aug 2019
Project: Externally funded research