Evidence of warm and humid interstadials in central Europe during early MIS 3 revealed by a multi-proxy speleothem record
Evidence of warm and humid interstadials in central Europe during early MIS 3 revealed by a multi-proxy speleothem record
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DOI：
10.1016/j.quascirev.2018.09.045
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发表时间：
2018-11
影响因子：
4
通讯作者：
Michael Weber;D. Scholz;A. Schröder‐Ritzrau;M. Deininger;C. Spötl;F. Lugli;R. Mertz‐Kraus;K. Jochum;J. Fohlmeister;Cintia F. Stumpf;D. Riechelmann
中科院分区：
文献类型：
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作者：
Michael Weber;D. Scholz;A. Schröder‐Ritzrau;M. Deininger;C. Spötl;F. Lugli;R. Mertz‐Kraus;K. Jochum;J. Fohlmeister;Cintia F. Stumpf;D. Riechelmann
海洋同位素阶段 3（MIS 3, 57–27 ka）的特点是多次快速气候振荡（即 Dansgaard-Oeschger (D/O-) 事件），这反映在各种气候档案中。到目前为止，来自中欧的 MIS 3 洞穴记录主要局限于位于温带高山冰川下方或靠近大西洋的洞穴。因此，MIS 3 似乎过于寒冷和干燥，无法使中欧阿尔卑斯山以北的洞穴植物生长。在这里，我们展示了来自德国邦克洞穴的新洞穴植物记录，该记录显示了两个不同的生长阶段：52.0 (+0.8, -0.5) 至 50.9 (+0.6, -1.3) ka 和 47.3 (+1.0, -0.6) 至 42.8 (±0.9) ka，拒绝这个假设。这两个生长阶段可能对应于 MIS 3 期间中欧最温暖和最潮湿的两个阶段，附近埃菲尔的花粉数据证实了这一点。分隔两个阶段的间断与 Heinrich stadial 5 (HS 5) 有关，尽管生长停止早于 HS 5 的开始。第一个生长阶段的特点是生长速度快，镁浓度和 Sr 同位素数据表明渗透率高，并且洞穴上方存在土壤覆盖。第二个生长阶段的特点是干燥，但仍然有利于洞穴植物的生长。在此阶段，δ13C 值显示出与 D/O 事件 12 相关的显着下降。这种转变的时间与来自欧洲的其他 MIS 3 洞穴数据和格陵兰冰芯数据一致。
Marine Isotope Stage 3 (MIS 3, 57–27 ka) was characterised by numerous rapid climate oscillations (i.e., Dansgaard-Oeschger (D/O-) events), which are reflected in various climate archives. So far, MIS 3 speleothem records from central Europe have mainly been restricted to caves located beneath temperate Alpine glaciers or close to the Atlantic Ocean. Thus, MIS 3 seemed to be too cold and dry to enable speleothem growth north of the Alps in central Europe.Here we present a new speleothem record from Bunker Cave, Germany, which shows two distinct growth phases from 52.0 (+0.8, −0.5) to 50.9 (+0.6, −1.3) ka and 47.3 (+1.0, −0.6) to 42.8 (±0.9) ka, rejecting this hypothesis. These two growth phases potentially correspond to the two warmest and most humid phases in central Europe during MIS 3, which is confirmed by pollen data from the nearby Eifel. The hiatus separating the two phases is associated with Heinrich stadial 5 (HS 5), although the growth stop precedes the onset of HS 5. The first growth phase is characterised by a fast growth rate, and Mg concentrations and Sr isotope data suggest high infiltration and the presence of soil cover above the cave. The second growth phase was characterised by drier, but still favourable conditions for speleothem growth. During this phase, the δ13C values show a significant decrease associated with D/O-event 12. The timing of this shift is in agreement with other MIS 3 speleothem data from Europe and Greenland ice core data.