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Changes in the depth of Lake Qinghai since the last deglaciation and asynchrony between lake depth and precipitation over the northeastern Tibetan Plateau
Global and Planetary Change ( IF 3.9 ) Pub Date : 2020-05-01 , DOI: 10.1016/j.gloplacha.2020.103156
Zheng Wang , Fan Zhang , Xiangzhong Li , Yunning Cao , Jing Hu , Huangye Wang , Hongxuan Lu , Ting Li , Weiguo Liu

Abstract As a transitional region between arid and semi-arid areas, and the climatic junction where the Asian summer monsoon and the Westerlies interact strongly, the climatic pattern of northeastern Tibetan Plateau has always been the focus of paleoclimate research. In this study, the changes in the lake depth of Lake Qinghai on the northeastern Tibetan Plateau were reconstructed from analyses of biomarkers in sediment records from the center of the lake and aeolian deposits on its southern bank. On millennial scale, the lake depth showed a fluctuating upward trend from the minimum depth at 15.6 ka to the maximum depth at 5.9 ka, revealing an overall warming-wetting pattern since the last deglaciation. Compared to the typical monsoon-dominated areas, the relatively humid late Holocene of Lake Qinghai appears to have been related to a weakened evaporation on the long-term trend. We show that on a long-term scale, precipitation may control the rate of changes in lake depth. This reasonably explains the asynchrony of precipitation and lake depth over the northeastern Tibetan Plateau during the mid-Holocene.

中文翻译:

青藏高原东北部末次冰消以来青海湖湖深变化及湖深与降水的不同步性

摘要 青藏高原东北部气候格局是干旱半干旱区的过渡地带,是亚洲夏季风与西风带强相互作用的气候交汇点,历来是古气候研究的热点。本研究通过对青藏高原东北部青海湖中心沉积物记录和南岸风积沉积物生物标志物的分析,重建青海湖湖深变化。在千禧年尺度上,湖深呈现出从15.6 ka的最小深度到5.9 ka的最大深度的波动上升趋势,揭示了自上次冰消期以来的整体暖湿格局。与典型的季风主导区相比,青海湖全新世晚期相对湿润,从长期趋势来看似乎与蒸发减弱有关。我们表明,从长期来看,降水可能会控制湖泊深度的变化速度。这合理地解释了中全新世青藏高原东北部降水与湖深的不同步性。
更新日期:2020-05-01
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