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A combination of biotic, sedimentary and biogeochemical proxies was used to investigate the timing and causes of post-18th century changes in the stratigraphic record of a large, deep lake on the Boothia Peninsula, Nunavut, Canada (70°15′ N, 94°30′ W). A varve chronology verified with radioisotopic dating (210Pb and 137Cs) revealed a complex pattern of environmental dynamics since c. AD 1830. An increase...
Hydrologic models are developed for two lakes in interior Alaska to determine quantitative estimates of precipitation over the past 12,500 yrs. Lake levels were reconstructed from core transects for these basins, which probably formed prior to the late Wisconsin. Lake sediment cores indicate that these lakes were shallow prior to 12,500 yr B.P. and increased in level with some fluctuation until they...
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