Abrupt or gradual?
- 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 similar to 15,700 to 15,460 yr) during the onset of the African Humid Period (AHP), and over 990 yr (from similar to 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 similar to 100 yr) at similar to 13,260 yr and lasted until similar to 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 similar to 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 theWe 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 similar to 15,700 to 15,460 yr) during the onset of the African Humid Period (AHP), and over 990 yr (from similar to 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 similar to 100 yr) at similar to 13,260 yr and lasted until similar to 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 similar to 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.…
Author details: | Martin H. TrauthORCiDGND, Verena FoersterGND, Annett JungingerORCiD, Asfawossen AsratORCiD, Henry F. LambORCiD, Frank SchäbitzORCiDGND |
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DOI: | https://doi.org/10.1017/qua.2018.30 |
ISSN: | 0033-5894 |
ISSN: | 1096-0287 |
Title of parent work (English): | Quaternary research : an interdisciplinary journal |
Subtitle (English): | Change point analysis of the late Pleistocene-Holocene climate record from Chew Bahir, southern Ethiopia |
Publisher: | Cambridge Univ. Press |
Place of publishing: | New York |
Publication type: | Article |
Language: | English |
Year of first publication: | 2018 |
Publication year: | 2018 |
Release date: | 2021/10/06 |
Tag: | African Humid Period; Change point analysis; Dansgaard-Oeschger cycles; Holocene; Late Pleistocene; Paleoclimatology; Principal component analysis; Southern Ethiopian Rift; Younger Dryas |
Volume: | 90 |
Issue: | 2 |
Number of pages: | 10 |
First page: | 321 |
Last Page: | 330 |
Funding institution: | German Research Foundation (DFG) through the Priority Program SPP 1006 ICDP; German Research Foundation (DFG)German Research Foundation (DFG) [CRC 806] |
Organizational units: | Mathematisch-Naturwissenschaftliche Fakultät / Institut für Geowissenschaften |
DDC classification: | 5 Naturwissenschaften und Mathematik / 55 Geowissenschaften, Geologie / 550 Geowissenschaften |
Peer review: | Referiert |
Publishing method: | Open Access / Green Open-Access |