Discussion of the climatic change in recent 600 years and dropping of lake water-level, Qinghai Lake drainage basin

Abstract

根据青海湖流域及其邻近地区树木年轮资料重建的历史时期气候资料序列,给出了流域近六百年来的主要冷、暖、干、湿期,并对器测时期的气候变化趋势作了分析。指出,近百年来气候暖干化是造成湖水位下降的主要原因;对于湖水位年际变化与前期降水影响系统、不同气候类型以及地面气象要素的关系作了统计分析。;The historical climatic data sequence is reconstructed on the basis of tree ring data of Qinghai Lake Basin and neighbouring areas.In this paper four main periods (cold,warm,dry and wet) of the lake basin in the past 600 years are given and the climatic trend is predicted.It appears that the lake water-level falling is mainly caused by the warm-dry climatic tendency in recent 100 years.In addition.the relationships between the annual variation of the lake water level, the weather systems affecting antecedent precipitation.various climatic patterns and land surface meteorological elements are analyzed by means of statistical method.