Nevertheless, some important differences were also observed.For two of the three lakes, there was a significant difference in average sediment accumulation rate during the past 33 yrs as calculated from Pb in the recent cores.In addition, the results of the sensitivity analysis are reported.The sediment dating may be supplemented with estimations of the content of alga pigments in the depths required.Thus, it will be possible not only to describe the sediment age, but also to give a picture of the dominant mixture of plankton alga at the same time.
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The naturally lead isotope 210Pb may be used to date aquatic sediments and peat bogs.
The method is suitable for dating approximately 100 years back.
In all three lakes, rates calculated from Pb distributions both above and below this horizon agreed, within measurement uncertainty, in recent and older cores.
Furthermore, when the older data were corrected for 20 yrs of burial, the changes in slope in Pb distributions occurred at the same depth in each pair of cores.
Lower values for all the parameters are obtained in all cases if the effect of compaction is not considered.