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湖泊科学  2012 

蒸发和环流因素对湖泊演化的影响——河西走廊猪野泽不同位置全新世沉积物古环境意义探讨

DOI: 10.18307/2012.0321

Keywords: 全新世,湖泊演化,环流,蒸发,猪野泽,石羊河,河西走廊

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Abstract:

湖泊不同位置沉积物重建的古环境变化过程往往具有差异,而这种差异可能揭示了不同的古环境信息.本文以河西走廊石羊河流域终端湖泊猪野泽为例,探讨湖泊不同位置沉积物所代表的古环境意义.位于湖盆边缘的三角城剖面可能反映了石羊河上游地区的降水及其古径流量的变化,这种变化在千年尺度上对应了北大西洋Bond事件,显示该区域通过季风环流系统与全球气候系统的联系.位于湖泊中部的QTH01、QTH02、QTL-03剖面反映了湖泊演化的信息,显示中全新世期间(约7.0-约3.5calkaBP)湖泊水位较高的特征,但是这种特征并不能和该流域的古径流相联系,说明该区域湖泊演化除了受千年尺度大气环流特征的影响外,湖泊表面蒸发可能也起了重要作用.该研究为中亚地区普遍存在的中全新世高湖面问题提供了研究思路.

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