Abstract
Oxygen isotope data from groundwater, streams and crater lakes in central Ethiopia provide a basis for modelling lake hydrological and isotopic budgets. The environmental parameters δ A(isotopic composition of vapor) and ε* (equilibrium fractionation factor) were determined by a semi-empirical approach using one lake as a terminal index lake. The models show that lake oxygen-isotope composition is more sensitive to rainfall-related parameters (humidity and δ A) than to the isotopic composition of inflow (δ in). The isotopic composition of the lacustrine sedimentary carbonates should therefore provide a record of past rainfall variation.
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Kebede, S., Lamb, H., Telford, R., Leng, M., Umer, M. (2002). Lake — Groundwater Relationships, Oxygen Isotope Balance and Climate Sensitivity of the Bishoftu Crater Lakes, Ethiopia. In: Odada, E.O., Olago, D.O. (eds) The East African Great Lakes: Limnology, Palaeolimnology and Biodiversity. Advances in Global Change Research, vol 12. Springer, Dordrecht. https://doi.org/10.1007/0-306-48201-0_9
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