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Late Quaternary climate change in the north-eastern highlands of Ethiopia: a high resolution 15,600 year diatom and pigment record from Lake Hayk

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posted on 09.10.2018 by Katie Loakes, David Ryves, Henry F. Lamb, Frank Schabitz, Michael Dee, J.J. Tyler, Keely Mills, Suzanne McGowan
Multi-proxy analyses of an 8 m sediment core from Lake Hayk, a closed, freshwater lake in the north-central highlands of Ethiopia, provide a record of changing lake level and inferred regional climatic change for the last 15.6 cal ka years. Between ca. 15.6-15.2 cal ka BP, a lowstand was synchronous with Heinrich Event 1 and an intense drought across Eastern Africa. At ca. 15.2 cal ka BP a lake began to develop at the core site in response to wetter conditions, at the onset of the African Humid Period (AHP). However, in contrast to other lakes in eastern Africa, Hayk lake level fell around ca. 14.8 cal ka BP, indicating a climate shift towards aridity. The lake began filling again at ca. 12.3 cal ka BP and reached maximum water depth between ca. 12.0-10.0 cal ka BP. Lake level declined slowly during the Holocene, culminating in the termination of the AHP at Hayk between ca. 5.2-4.6 cal ka BP. In the late Holocene, ca. 2.2-1.3 cal ka BP, Lake Hayk was again deep and fresh with some evidence of short-term lake level variability. The palaeo-record from Lake Hayk indicates that while it experienced, to a broad degree, the same glacial-interglacial dynamics and sub-millennial shifts in climate found in other palaeolimnological records from eastern Africa, there are offsets in timing and rate of response. These differences reflect chronological discrepancies between records, as well as the varying climate sensitivities and site-specific factors of individual lake basins. This record highlights the different responses by lakes in a climatically vulnerable area of Ethiopia.

History

School

  • Social Sciences

Department

  • Geography and Environment

Published in

Quaternary Science Reviews

Volume

202

Pages

166-181

Citation

LOAKES, K. ... et al., 2018. Late Quaternary climate change in the north-eastern highlands of Ethiopia: a high resolution 15,600 year diatom and pigment record from Lake Hayk. Quaternary Science Reviews, 202, pp.166-181.

Publisher

© Elsevier

Version

AM (Accepted Manuscript)

Publisher statement

This paper was accepted for publication in the journal Quaternary Science Reviews and the definitive published version is available at https://doi.org/10.1016/j.quascirev.2018.09.005

Acceptance date

04/09/2018

Publication date

2018-10-16

Copyright date

2018

ISSN

1873-457X

Language

en

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