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新疆干旱区柴窝堡湖沉积记录的150年来气候环境特征

, PP. 1137-1144

Keywords: 干旱区,柴窝堡湖,沉积记录,有序样品最优聚类,气候环境

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Abstract:

通过乌鲁木齐附近柴窝堡湖钻孔岩芯的粒度、有机质含量、化学元素以及同位素等多项分析,开展了研究区近150年来的气候环境演化研究。通过沉积记录与器测气象资料比较,认为沉积物的有机质含量反映了流域降水的变化,而有机质碳同位素的变化则与温度相关。在运用有序样品最优聚类分析对沉积物地球化学元素序列进行阶段划分的基础上,综合粒度、有机质含量以及同位素等多环境代用指标的分析,恢复了不同阶段的气候环境信息。结果表明,1860~1910A.D.,各环境指标显示当时湖泊水位较高,湖水较深,显示偏冷、偏湿的气候环境特征。1910~1950A.D.,粒度、地球化学元素、有机质、磁化率等指标波动明显,虽然有机碳同位素值有所升高,但仍然总体偏负,显示该阶段湖泊环境总体上波动强烈,气候不稳定。其中约1920A.D.左右,粒度显示突然变化,有机碳同位素、烧失量、元素含量等也均发生了显著的波动,指示明显气候环境事件的存在。1950A.D.以来,钻孔岩芯的磁化率升高,重金属元素含量以及总磷含量呈现明显富集,而有机质及其碳同位素变化却与器测温度和降水变化一致,指示了近期气候和人类活动对湖泊环境的影响。

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