Historical changes in phosphorus accumulation in a small lake
Isotopes like 210Pb and 137Cs are effective tools for determining chronology in lake sediments. Once the chronology is established, environmental changes in lakes can be investigated, and the causes for those changes can often be inferred. 210Pb and 137Cs profiles were constructed for the sediments of Crystal Lake, Connecticut, USA. The geochronology was used to determine the historical changes in organic matter and P accumulation in the sediment. Those profiles showed two significant periods of sedimentation which correlate with major precipitation events. Decreasing P accumulation in the sediments of the lake in the last decade was also correlated with increasing eutrophication as documented by increases in epilimnetic P and decreases in transparency.
Murray, T. E. and Gottgens, J. F., "Historical changes in phosphorus accumulation in a small lake" (1997). Faculty Publications. 1519.