欧洲南部三期末气候的突然变化。
Abrupt climate changes during Termination III in Southern Europe.
机构信息
Department of Geoenvironmental Processes and Global Change, Pyrenean Institute of Ecology-Consejo Superior de Investigaciones Científicas (IPE-CSIC), 50059 Zaragoza, Spain;
Earth Sciences Department, University of Zaragoza, 50009 Zaragoza, Spain.
出版信息
Proc Natl Acad Sci U S A. 2017 Sep 19;114(38):10047-10052. doi: 10.1073/pnas.1619615114. Epub 2017 Sep 5.
The Late Quaternary glacial-interglacial transitions represent the highest amplitude climate changes over the last million years. Unraveling the sequence of events and feedbacks at Termination III (T-III), including potential abrupt climate reversals similar to those of the last Termination, has been particularly challenging due to the scarcity of well-dated records worldwide. Here, we present speleothem data from southern Europe covering the interval from 262.7 to 217.9 kyBP, including the transition from marine isotope stage (MIS) 8 to MIS 7e. High-resolution δC, δO, and Mg/Ca profiles reveal major millennial-scale changes in aridity manifested in changing water availability and vegetation productivity. uranium-thorium dates provide a solid chronology for two millennial-scale events (S8.1 and S8.2) which, compared with the last two terminations, has some common features with Heinrich 1 and Heinrich 2 in Termination I (T-I).
末次冰消期的冰期-间冰期转变代表了过去 100 万年中最高幅度的气候变化。由于全球范围内缺乏良好定年的记录，因此，要揭示第三纪冰消期（T-III）事件序列和反馈，包括类似于末次冰消期的潜在突发性气候逆转，一直是一项特别具有挑战性的任务。在这里，我们提供了来自欧洲南部的洞穴石笋数据，涵盖了从 262.7 到 217.9 kyBP 的时间段，包括从海洋同位素阶段（MIS）8 到 MIS 7e 的转变。高分辨率的 δC、δO 和 Mg/Ca 剖面揭示了干旱的千年尺度变化，表现为水供应和植被生产力的变化。铀-钍定年为两个千年尺度事件（S8.1 和 S8.2）提供了可靠的年代框架，与最后两个冰消期相比，这些事件与第一纪冰消期（T-I）的 Heinrich 1 和 Heinrich 2 有一些共同特征。
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