Holocene temperature fluctuations in the northern Tibetan Plateau
Holocene temperature fluctuations in the northern Tibetan Plateau
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DOI：
10.1016/j.yqres.2013.05.001
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发表时间：
2013-07
影响因子：
2.3
通讯作者：
Cheng Zhao;Zhonghui Liu;E. Rohling;Zicheng Yu;Weiguo Liu;Yuxin He;Yan Zhao;Fahu Chen
中科院分区：
文献类型：
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作者：
Cheng Zhao;Zhonghui Liu;E. Rohling;Zicheng Yu;Weiguo Liu;Yuxin He;Yan Zhao;Fahu Chen
干旱中亚（ACA）位于中纬度西风带和亚洲夏季风西北边界之间的主要气候边界，但对其气候历史的高质量重建却很少。在这里，我们校准了一种新的湖泊温度有机地球化学代理，并提供了青藏高原北部 ACA 东缘的 Hurleg 湖 45 年分辨率的温度记录。与同一样本的其他代理数据相结合，揭示了整个记录中明显的暖干气候关联，这与亚洲季风地区发现的暖湿关联形成鲜明对比。这表明，在整个全新世，西风和季风区之间的气候边界大致保持在同一位置，至少在我们的研究地点附近是这样。在过去的9000年里，发现了六次千禧年规模的寒冷事件，这与之前记录的北方高纬度变冷和热带干旱事件大致吻合。这表明北大西洋和热带季风气候系统之间通过西风环流存在联系。最后，我们还观察到全新世中期之后区域气候变异性的增加，我们通过地表反照率反馈将其与季风区植被（森林）覆盖的变化联系起来。
Arid Central Asia (ACA) lies on a major climatic boundary between the mid-latitude westerlies and the northwestern limit of the Asian summer monsoon, yet only a few high-quality reconstructions exist for its climate history. Here we calibrate a new organic geochemical proxy for lake temperature, and present a 45-yr-resolution temperature record from Hurleg Lake at the eastern margin of the ACA in the northern Tibetan Plateau. Combination with other proxy data from the same samples reveals a distinct warm–dry climate association throughout the record, which contrasts with the warm–wet association found in the Asian monsoon region. This indicates that the climatic boundary between the westerly and the monsoon regimes has remained roughly in the same place throughout the Holocene, at least near our study site. Six millennial-scale cold events are found within the past 9000 yr, which approximately coincide with previously documented events of northern high-latitude cooling and tropical drought. This suggests a connection between the North Atlantic and tropical monsoon climate systems, via the westerly circulation. Finally, we also observe an increase in regional climate variability after the mid-Holocene, which we relate to changes in vegetation (forest) cover in the monsoon region through a land-surface albedo feedback.