Skip to main content

Research Repository

Advanced Search

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

Loakes, Katie L.; Ryves, David B.; Lamb, Henry F.; Sch�bitz, Frank; Dee, Michael; Tyler, Jonathan J.; Mills, Keely; McGowan, Suzanne

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


Authors

Katie L. Loakes

David B. Ryves

Henry F. Lamb

Frank Sch�bitz

Michael Dee

Jonathan J. Tyler

Keely Mills

Suzanne McGowan



Abstract

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.

Citation

Loakes, K. L., Ryves, D. B., Lamb, H. F., Schäbitz, F., Dee, M., Tyler, J. J., …McGowan, S. (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, 166-181. https://doi.org/10.1016/j.quascirev.2018.09.005

Journal Article Type Article
Acceptance Date Sep 4, 2018
Online Publication Date Oct 16, 2018
Publication Date Dec 15, 2018
Deposit Date Nov 12, 2018
Publicly Available Date Oct 17, 2019
Journal Quaternary Science Reviews
Print ISSN 0277-3791
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 202
Pages 166-181
DOI https://doi.org/10.1016/j.quascirev.2018.09.005
Keywords Archaeology; Archaeology; Global and Planetary Change; Geology; Ecology, Evolution, Behavior and Systematics
Public URL https://nottingham-repository.worktribe.com/output/1242209
Publisher URL https://www.sciencedirect.com/science/article/pii/S0277379118301379

Files




Downloadable Citations