TY - JOUR
T1 - Late Quaternary climate change in the north-eastern highlands of Ethiopia: A high resolution 15,600 year diatom and pigment record from Lake Hayk
AU - Loakes, K.L.
AU - Ryves, D.B.
AU - Lamb, H.F.
AU - Schäbitz, F.
AU - Dee, M.
AU - Tyler, J.J.
AU - Mills, K.
AU - McGowan, S.
N1 - CODEN: QSRED
Funding details: Natural Environment Research Council, NERC
Funding details: Loughborough University, Lboro
Funding details: Queen's University Belfast, QUB
Funding details: University College Cork, UCC, 806
Funding details: British Geological Survey, BGS
Funding details: Universität zu Köln, UoC
Funding text 1: With thanks to the the University of Cologne CRC (Collaborative Research Centre) 806 for funding core collection: http://www.sfb806.uni-koeln.de/index.php/projects/former-projects/a3. Thanks to Oliver Langkamp (student co-worker at Cologne University) for his help preparing and performing the coring. Three AMS 14C dates were awarded to Katie Loakes under the the QRA-14CHRONO Centre Radiocarbon Dating award, supported by supported by Prof Paula Reimer (14CHRONO centre, Queens University Belfast). Katie Loakes was supported by a Loughborough University PhD award. Keely Mills publishes with the approval of the Executive Director, British Geological Survey (NERC). We thank both reviewers for their thoughtful and constructive comments which have helped improve the manuscript.
Funding text 2: With thanks to the the University of Cologne CRC (Collaborative Research Centre) 806 for funding core collection: http://www.sfb806.uni-koeln.de/index.php/projects/former-projects/a3 . Thanks to Oliver Langkamp (student co-worker at Cologne University) for his help preparing and performing the coring. Three AMS 14C dates were awarded to Katie Loakes under the the QRA-14CHRONO Centre Radiocarbon Dating award, supported by supported by Prof Paula Reimer (14CHRONO centre, Queens University Belfast). Katie Loakes was supported by a Loughborough University PhD award. Keely Mills publishes with the approval of the Executive Director, British Geological Survey (NERC). We thank both reviewers for their thoughtful and constructive comments which have helped improve the manuscript.
PY - 2018
Y1 - 2018
N2 - 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.
AB - 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.
KW - African Humid Period
KW - Diatoms
KW - Ethiopia
KW - Heinrich event
KW - Holocene
KW - Lake level
KW - Palaeolimnology
KW - Pigments
U2 - 10.1016/j.quascirev.2018.09.005
DO - 10.1016/j.quascirev.2018.09.005
M3 - Article
VL - 202
SP - 166
EP - 181
ER -