Radioisotopic evidence of perturbations of recent sedimentary record in lakes : a word of caution for climate studies

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....

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Bibliographic Details
Published in:Climate dynamics 1992, Vol.6 (3-4), p.145-152
Main Authors: DOMINIK, J, LOIZEAU, J.-L, SPAN, D
Format: Article
Language:English
Subjects:
Climatology. Bioclimatology. Climate change
Earth, ocean, space
Exact sciences and technology
External geophysics
Meteorology
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Summary: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.
ISSN:0930-7575
1432-0894
DOI:10.1007/BF00193526