Abstract
The high-resolution and multi-proxy analysis of lacustrine sediments from the Gucheng Lake has revealed the palaeodimatic and palaeoenvironmental evolutionary process since 15 ka B.P. The formation, expansion and shrinkage of the lake is closely related to monsoon rain caused by strength change of monsoon circulation which is controlled by orbit forcing. An abrupt descending of temperature occurring from 11.3 to 11.0ka B.P. may be correlative to Younger Dryas event, which trancated the monsoon climate cycle. Through the correlation with adjacent regions, it can be known that there were twice north shifts and twice south migrations for polar front of monsoon.
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