Radioisotopic evidence of perturbations of recent sedimentary record in lakes: a word of caution for climate studies |
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Authors: | Janusz Dominik Jean-Luc Loizeau Daniel Span |
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Affiliation: | (1) Institut F-A Forel, Université de Genève, 10 route de Suisse, CH-1290 Versoix, Switzerland |
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Abstract: | The rate of climatic change estimated from the gradient of signals recorded in lake sediments may be erroneous if post-depositional perturbations are overlooked. A smear out of a pulse signal, over a variable thickness of core section, due to physical or biological mixing, is a well known phenomena. Much less attention is paid to a possible overestimation of the rate of change when a part of record is missing due to an erosion event. In this paper we show a few examples of recent lake sediment perturbations and the resulting distortions in the time scale, as documented by short-lived radionuclides.Contribution to Clima Locarno — Past and Present Climate Dynamics; Conference September 1990, Swiss Academy of Sciences — National Climate Program |
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