Abstract:

Paleoenvironmental record in the AB 32 sediment core from Ikroavik Lake in Barrow,Arctic Alaska was studied with geochemical assemblages,leaching factors and paleotemperature indicators. According to the geochemical characteristics of the borecore AB 32 and 210 Pb dating,climatic and environmental changes in Barrow,Alaska reconstructed are as follows:1) from 1600 to 1735 AD,it was a period of cold and dry; 2) from 1735 to 1830 AD,it was becoming warm and moist; 3) around 1830 AD,it was obviously with a demarcation of geochemical significance;1830-1994 AD,it was continuous more warm and moist,but appeared cold period around 1969-1970 AD. The paleogeochemical characteristics in AB 32 borecore around 1830 AD are similar with those of modern environment in Ikroavik lake and response to climatic and environmental changes reflected in the borecore AB 67 from Elson lagoon.