固城湖沉积的多环境指标高分辨率分析揭示了15ka以来古气候古环境演变的过程,固城湖的形成、扩张和收缩与季风环流的变化及其引起的季风降雨关系密切,后者明显受轨道驱动的控制。其中11.3～11.0KaBP突变的降温,可能与新仙女木事件相当,截断了太阳辐射增强导致的季风气候旋回。通过与相邻南北区域的对比,季风极锋位置存在两次北推和两次南迁的过程。 High-resolution analysis of multi-environmental indicators of sediments in Gucheng Lake reveals the paleoclimate paleoenvironment evolution since 15 ka. The formation, expansion and contraction of Gucheng Lake are closely related to the changes of monsoon circulation and the monsoon rainfall caused by it. The latter is obviously Track-driven control. Among them, the 11.3 ~ 11.0KaBP mutation cooling may be equivalent to the new fairy wood event, cutting off the monsoon climate cycle caused by enhanced solar radiation. Through comparison with the adjacent north and south regions, there are two times of north push and two times of south move in the polar front of the monsoon.