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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
agricultural and biological sciences
Climatic and non-climatic effects on the δ
18
O and δ
13
C compositions of Lake Awassa, Ethiopia, during the last 6.5 ka
Quaternary Science Reviews, Volume 21, No. 20-22, Year 2002
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Description
A comparison of a 6450 14C yr δ18O and δ13C record of authigenic calcite from Lake Awassa, Ethiopia, with other proxy climate records in the area suggests that the lake records long-term regional climate changes. Co-varying and increasing δ18O and δ13C values from ∼4800 BP suggest an aridification of climate after the early Holocene insolation maximum. After 4000 BP, humid conditions return until after ∼2800 BP when δ18O increases again, reflecting more arid conditions recorded elsewhere in Ethiopia. In addition to these long-term changes, there are abrupt decreases in both δ18Ocalcite and δ13calcite immediately after tephra layers. The likeliest explanation for these abrupt decreases in isotopes is the effect of tephra on the lake's catchment vegetation. δ18O, δ13C and lake-level measurements from Lake Awassa since the 1970s suggest that the lake is currently isotopically sensitive to short-term (annual-decadal) climate change. However, during this period, the catchment has undergone progressive deforestation that may have caused an increase in runoff. Caution is therefore required when reconstructing palaeoclimates as a contemporary lake may not always be a good analogue for lake hydrology in the past. © 2002 Elsevier Science Ltd. All rights reserved.
Authors & Co-Authors
Lamb, Angela L.
United Kingdom, Liverpool
Liverpool John Moores University
Leng, Melanie J.
United Kingdom, Nottingham
British Geological Survey
Lamb, Henry F.
United Kingdom, Aberystwyth
Aberystwyth University
Telford, Richard J.
United Kingdom, Newcastle
Newcastle University
Mohammed, Mohammed Umer
Ethiopia, Addis Ababa
Addis Ababa University
Statistics
Citations: 41
Authors: 5
Affiliations: 5
Identifiers
Doi:
10.1016/S0277-3791(02)00087-2
ISSN:
02773791
Research Areas
Environmental
Study Locations
Ethiopia