A short-term climate oscillation during the Holsteinian interglacial (MIS 11c): An analogy to the 8.2 ka climatic event?
A short-term climate oscillation during the Holsteinian interglacial (MIS 11c): An analogy to the 8.2 ka climatic event?
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荷斯坦纪间冰期期间的短期气候振荡（MIS 11c）：与 8·2 ka 气候事件的类比？
DOI：
10.1016/j.gloplacha.2012.05.011
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发表时间：
--
影响因子：
3.9
通讯作者：
Lotter
中科院分区：
文献类型：
--
作者：
Koutsodendris;Müller;Brauer;Fletcher;Kirilova;Verhagen;Lücke;Lotter
为了深入了解间冰期气候突变的机制，我们研究了在荷尔斯泰因间冰期（海洋同位素阶段11c）期间一个突出的气候诱导植被退缩的特征和空间范围。根据对德特林根（德国北部）湖泊沉积物的花粉和碎屑的分析，这种气候振荡，在这里被称为“老荷尔斯泰因振荡”（OHO），持续了220年。它可以细分为90 a温带乔木类群的减少与松木和草本植物的扩张，130 a以桦木和桤木的扩张为标志的恢复阶段，随后温带乔木的恢复。硅藻组合的变化和生物源二氧化硅测量的δ18O的变化证实了OHO的气候诱导性质，表明气候影响了Dethlingen古湖的水生生态系统。欧洲50°纬度以北的花粉记录中广泛记录了欧霍区，其特征是从不列颠群岛到波兰的北方气候条件，冬季寒冷，具有温度和水分可用性下降的梯度，并向东欧大陆性增加。这种模式表明西风带的影响减弱和/或西伯利亚高压的影响增强。通过与全新世8.2ka事件的比较，发现在陆地生态系统的印记和间冰期边界条件上有非常密切的相似之处。因此，与8.2ka事件类似，由融水引起的北大西洋深水形成的短暂减缓似乎是OHO的合理触发机制。如果正确的话，融水释放到北大西洋可能是间冰期气候突变的一个比以前认为的更常见的因素。我们得出结论，融水引起的间冰期气候挫折优先发生在夏季日照增加率较低的时候，这有利于大尺度大陆冰盖在间冰期的持续存在。
To gain insights into the mechanisms of abrupt climate change within interglacials, we have examined the characteristics and spatial extent of a prominent, climatically induced vegetation setback during the Holsteinian interglacial (Marine Isotope Stage 11c). Based on analyses of pollen and varves of lake sediments from Dethlingen (northern Germany), this climatic oscillation, here termed the “Older Holsteinian Oscillation” (OHO), lasted 220years. It can be subdivided into a 90-year-long decline of temperate tree taxa associated with an expansion of Pinus and herbs, and a 130-year-long recovery phase marked by the expansion of Betula and Alnus, and the subsequent recovery of temperate trees. The climate-induced nature of the OHO is corroborated by changes in diatom assemblages and δ18O measured on biogenic silica indicating an impact on the aquatic ecosystem of the Dethlingen paleolake. The OHO is widely documented in pollen records from Europe north of 50° latitude and is characterized by boreal climate conditions with cold winters from the British Isles to Poland, with a gradient of decreasing temperature and moisture availability, and increased continentality towards eastern Europe. This pattern points to a weakened influence of the westerlies and/or a stronger influence of the Siberian High. A comparison of the OHO with the 8.2ka event of the Holocene reveals close similarities regarding the imprint on terrestrial ecosystems and the interglacial boundary conditions. Hence, in analogy to the 8.2ka event, a transient, meltwater-induced slowdown of the North Atlantic Deep Water formation appears as a plausible trigger mechanism for the OHO. If correct, meltwater release into the North Atlantic may be a more common agent of abrupt climate change during interglacials than previously thought. We conclude that meltwater-induced climate setbacks during interglacials preferentially occurred when low rates of summer insolation increase during the preceding terminations facilitated the persistence of large-scale continental ice-sheets well into the interglacials.
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