Centennial-scale vegetation dynamics and climate variability in SE Europe during Marine Isotope Stage 11 based on a pollen record from Lake Ohrid
Centennial-scale vegetation dynamics and climate variability in SE Europe during Marine Isotope Stage 11 based on a pollen record from Lake Ohrid
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DOI：
10.1016/j.quascirev.2018.04.014
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发表时间：
2018-06-15
影响因子：
4
通讯作者：
Pross, Joerg
中科院分区：
文献类型：
--
作者：
Kousis, Ilias;Koutsodendris, Andreas;Pross, Joerg
为了更好地了解海洋同位素阶段 (MIS) 11 期间的气候变化，我们在这里展示了来自奥赫里德湖（巴尔干半岛）的新的百年尺度分辨率的花粉记录，该记录源自国际大陆科学钻探计划 (ICDP) 活动期间取回的沉积岩芯。我们的孢粉学数据，通过基于花粉的定量气候重建得到增强，可以深入了解植被动态，从而了解欧洲东南部在全新世最佳轨道模拟之一期间的气候变化。将我们的孢粉学结果与奥赫里德湖的其他代理数据以及区域和全球气候记录进行比较表明，欧洲东南部的植被对 MIS 11 期间的长期和短期气候变化都做出了敏感的反应。我们的孢粉学记录的年表基于轨道调谐，并得到了在意大利中部维科火山检测到的新火山灰的进一步支持，其日期可追溯到 410+/-2ka。我们的研究表明，MIS 11c（类似于424-398 ka）是MIS 11最温暖的区间。间冰期的较年轻部分（即MIS 11b-11a；类似于398-367 ka）表现出逐渐变冷的趋势，过渡到MIS 10。其特征是相当大的千年尺度变化，由六次森林突然收缩事件推断。有趣的是，第一次森林收缩发生在 MIS 11c 的完全间冰期条件下；这一事件持续了大约1.7 kyrs（406.2 -404.5 ka），其特点是冬季气温和年降水量大幅减少。最值得注意的是，它发生的时间与 MIS 11c 结束前的 7ka 相似，与北大西洋第一次强冰筏碎片事件之前的 15ka 相似。我们的研究结果表明，MIS 11期间的千年尺度气候变率在MIS 11c期间已经在南欧确立，这早于北大西洋，后者仅从MIS 11b开始记录。 (C) 2018 Elsevier Ltd. 保留所有权利。
To better understand climate variability during Marine Isotope Stage (MIS) 11, we here present a new, centennial-scale-resolution pollen record from Lake Ohrid (Balkan Peninsula) derived from sediment cores retrieved during an International Continental Scientific Drilling Program (ICDP) campaign. Our palynological data, augmented by quantitative pollen-based climate reconstructions, provide insight into the vegetation dynamics and thus also climate variability in SE Europe during one of the best orbital analogues for the Holocene. Comparison of our palynological results with other proxy data from Lake Ohrid as well as with regional and global climate records shows that the vegetation in SE Europe responded sensitively both to long-and short-term climate change during MIS 11. The chronology of our palynological record is based on orbital tuning, and is further supported by the detection of a new tephra from the Vico volcano, central Italy, dated to 410 +/- 2 ka. Our study indicates that MIS 11c (similar to 424-398 ka) was the warmest interval of MIS 11. The younger part of the interglacial (i.e., MIS 11b-11a;similar to 398-367 ka) exhibits a gradual cooling trend passing over into MIS 10. It is characterized by considerable millennial scale variability as inferred by six abrupt forest-contraction events. Interestingly, the first forest contraction occurred during full interglacial conditions of MIS 11c; this event lasted for similar to 1.7 kyrs (406.2 -404.5 ka) and was characterized by substantial reductions in winter temperature and annual precipitation. Most notably, it occurred similar to 7 ka before the end of MIS 11c and similar to 15 ka before the first strong ice-rafted debris event in the North Atlantic. Our findings suggest that millennial-scale climate variability during MIS 11 was established in Southern Europe already during MIS 11c, which is earlier than in the North Atlantic where it is registered only from MIS 11b onwards. (C) 2018 Elsevier Ltd. All rights reserved.