Universität zu Köln

Loakes, Katie L., Ryves, David B., Lamb, Henry F., Schaebitz, Frank ORCID: 0000-0003-3879-9308, Dee, Michael ORCID: 0000-0002-3116-453X, Tyler, Jonathan J., Mills, Keely ORCID: 0000-0002-0402-2317 and McGowan, Suzanne (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. Quat. Sci. Rev., 202. S. 166 - 182. OXFORD: PERGAMON-ELSEVIER SCIENCE LTD. ISSN 0277-3791

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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. 15.2-15.2 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. (C) 2018 Elsevier Ltd. All rights reserved.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Loakes, Katie L. UNSPECIFIED UNSPECIFIED UNSPECIFIED Ryves, David B. UNSPECIFIED UNSPECIFIED UNSPECIFIED Lamb, Henry F. UNSPECIFIED UNSPECIFIED UNSPECIFIED Schaebitz, Frank UNSPECIFIED orcid.org/0000-0003-3879-9308 UNSPECIFIED Dee, Michael UNSPECIFIED orcid.org/0000-0002-3116-453X UNSPECIFIED Tyler, Jonathan J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Mills, Keely UNSPECIFIED orcid.org/0000-0002-0402-2317 UNSPECIFIED McGowan, Suzanne UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-161968
DOI:	10.1016/j.quascirev.2018.09.005
Journal or Publication Title:	Quat. Sci. Rev.
Volume:	202
Page Range:	S. 166 - 182
Date:	2018
Publisher:	PERGAMON-ELSEVIER SCIENCE LTD
Place of Publication:	OXFORD
ISSN:	0277-3791
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language AFRICAN HUMID PERIOD; LATE PLEISTOCENE; TEMPERATURE VARIABILITY; MEDITERRANEAN REGION; CARBON-ISOTOPE; KENYA RIFT; SOREQ CAVE; HOLOCENE; MONSOON; EVENT Multiple languages Geography, Physical; Geosciences, Multidisciplinary Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/16196