Palynology of the Last Interglacial Complex at Lake Ohrid: palaeoenvironmental and palaeoclimatic inferences
Palynology of the Last Interglacial Complex at Lake Ohrid: palaeoenvironmental and palaeoclimatic inferences
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DOI：
10.1016/j.quascirev.2017.11.013
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发表时间：
2018-01
影响因子：
4
通讯作者：
Gaia Sinopoli;A. Masi;E. Regattieri;B. Wagner;A. Francke;O. Peyron;L. Sadori
中科院分区：
文献类型：
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作者：
Gaia Sinopoli;A. Masi;E. Regattieri;B. Wagner;A. Francke;O. Peyron;L. Sadori
在这篇文章中，我们介绍了从奥赫里德湖(阿尔巴尼亚/FYROM)恢复的最后间冰期复合体(LIC)的深部位置序列中获得的新的高分辨率孢粉结果，对应于海洋同位素地层学的海洋同位素阶段5(MIS5)。LIC包括130~70ka，包括末次间冰期Eemian(末次间冰期，LI)和末次冰川早期的稳定期和间歇期。在LIC期间，花粉记录显示了以森林和开阔的植被为特征的交替时期，明显类似于著名的欧洲记录的植被演替。我们的结果揭示了LI的三个关键阶段：第一阶段(128ka-125ka)，温度和降水迅速上升；中心阶段(125ka-118.5 ka)，以轻微降温为特征；晚期(118.5-112ka)，温度和降水均下降。在末次冰期早期，我们还发现了与格陵兰冰芯记录中记录的一系列冷事件相关的几个突发性事件，与北大西洋经向翻转环流减弱有关。新的高分辨率记录表明，奥赫里德湖是了解植被对区域水分有效性和温度变化波动的响应的重要地点，从而为地中海地区和北半球气候振荡之间的联系提供了新的证据。
In this article, we present new, high-resolution, pollen results obtained from the DEEP site sequence recovered from Lake Ohrid (Albania/FYROM) for the Last Interglacial Complex (LIC), corresponding to Marine Isotope Stage 5 (MIS 5) of the marine isotope stratigraphy. LIC covers the period between 130 and 70 ka and includes the Eemian (Last Interglacial, LI) and the succession of stadial and interstadial phases of the Early Last Glacial.During the LIC, the pollen record shows an alternation of periods characterized by forest and open vegetation, clearly resembling the well-known vegetational succession of other European records. Our results reveal three key phases for the LI: a first period (128-125 ka) with a rapid increase in temperature and precipitation, a central phase (125–118.5 ka) characterized by a slight cooling, and a late phase (118.5–112 ka), with a decline both in temperatures and precipitation. Besides the LI, we identify four more forested periods dominated by mesophilous trees and intercalated by colder and drier steppe phases, during which, however, most arboreal taxa never disappear.During the Early Last Glacial we also identify several abrupt events that can be correlated to the succession of cold events recorded in the Greenland ice core records, associated to a weakening of the North Atlantic Meridional Overturning Circulation.The new high-resolution record indicates that Lake Ohrid is an important site to understand the response of vegetation to fluctuations in regional moisture availability and temperature changes, and thus provides new evidence for the connection between the Mediterranean Region and Northern Hemisphere climate oscillations.