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首页> 外文期刊>Journal of quaternary science: JQS >Last deglacial and Holocene lake level variations of Qinghai Lake, north-eastern Qinghai-Tibetan Plateau
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Last deglacial and Holocene lake level variations of Qinghai Lake, north-eastern Qinghai-Tibetan Plateau

机译：青藏高原东北部青海湖最后冰期和全新世湖面变化

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摘要

Qinghai Lake is of significance for paleoclimate research because it lies in a pivotal region that is influenced by both the mid-latitude Westerlies and the low-latitude Asian summer monsoon (ASM). Most published lake level histories of Qinghai Lake are interpreted from drill-core proxies. Here we combine geomorphic shoreline investigations with optically stimulated luminescence dating to constrain lake level variations since the last deglacial. The results indicate that two periods of highstands occurred during the last deglacial (approximate to 16-14.9 and approximate to 12.6-12.2 ka), and that lake levels were 6-7.4m higher than at present. Lake levels dropped abruptly during the Younger Dryas, and were generally low with frequent fluctuations during the early Holocene. Qinghai Lake reached its highest Holocene level, 9.1m higher than modern, at approximate to 5 ka, and has regressed during the past 2 ka. We propose that high lake levels during the last deglacial were due mainly to melting glacial and permafrost waters, supplemented by enhanced Westerlies precipitation and decreased evaporation during Heinrich Event 1 (approximate to 16-14.9 ka) and increased ASM rainfall during the BOlling-Allerod warm period (approximate to 14-12 ka). Lake level fluctuations during the Holocene were generally in accordance with moisture variations in the marginal monsoon zones of inland China.
机译：青海湖对古气候研究具有重要意义，因为它位于受中纬西风和低纬亚洲夏季风（ASM）影响的关键地区。青海湖大部分已发表的湖平面历史都是根据钻芯代理解释的。在这里，我们将地貌海岸线研究与光学激发发光年代相结合，以限制自上次冰期以来的湖泊水位变化。结果表明，在上一次冰期期间发生了两次高潮期（大约16-14.9，大约12.6-12.2 ka），湖泊水位比目前高6-7.4m。在年轻的德里亚斯期间，湖泊水位突然下降，并且在全新世早期通常处于低水平且频繁波动。青海湖达到全新世最高水平，比现代高9.1m，约5 ka，并且在过去2 ka内逐渐消退。我们认为最后一次冰期期间的高湖水位主要是由于融化的冰川和多年冻土水，再加上Heinrich事件1（约16-14.9 ka）期间西风降水的增加和蒸发的减少，以及Bolling-Allerod暖期的ASM降水增加时间（约14-12 ka）。全新世期间的湖面波动通常与中国内陆边缘季风区的水分变化有关。

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