Holocene climate variability in Central Germany and a potential link to the polar North Atlantic: A replicated record from three coeval speleothems
Holocene climate variability in Central Germany and a potential link to the polar North Atlantic: A replicated record from three coeval speleothems
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DOI：
10.1177/0959683616670246
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发表时间：
2017-04
期刊：
影响因子：
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通讯作者：
Simon A Mischel;D. Scholz;C. Spötl;K. Jochum;A. Schröder‐Ritzrau;S. Fiedler
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文献类型：
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作者：
Simon A Mischel;D. Scholz;C. Spötl;K. Jochum;A. Schröder‐Ritzrau;S. Fiedler
在这里，我们提出了高分辨率的微量元素和稳定同位素记录从三个同时代的全新世石笋从Herbstlabyrinth洞穴系统，中央德国。采用MC-ICPMS ~（230）Th/U法对石笋进行了精确测年。其中一个石笋开始生长的时间为13.62 ± 0.13kaBP，覆盖了晚冰期，另外两个洞穴石笋分别开始生长的时间为11.13 ± 0.08和10.26 ± 0.08kaBP。这一组合记录涵盖了整个全新世。对不同气候代用指标的解释得到了详细洞穴监测方案数据的支持。新仙女木时期的寒冷条件反映在赫布斯特迷宫间歇性的石笋生长上。δ 18 O记录与NGRIP δ 18 O记录在千年时间尺度上基本一致，表明赫布斯特迷宫洞穴沉积物δ 18 O值反映了北大西洋地区大尺度的气候变率。8.2ka事件在δ ~（18）O记录中表现为明显的负偏移。在所有其他代理中，它没有反映为重大偏离。相关性和主成分分析使我们能够理清影响稳定同位素和痕量元素信号的各种过程。具有较高P、Ba和U浓度和更负的δ 13 C值的阶段被解释为反映洞穴上方更有生产力的植被。Mg与P、Ba和U呈负相关，与δ 13 C呈正相关，表明在植被生长较旺盛的时期，Mg的补给量较大，这可能与降雨量增加有关。大多数观察到的阶段，减少植被生产力和干燥的气候相吻合的冷却器期间在极地北大西洋反映了更高的丰度的赤铁矿染色的颗粒（即邦德事件），这表明在中欧和极地北大西洋陆地气候之间的密切关系。
Here, we present high-resolution trace element and stable isotope records from three coeval Holocene stalagmites from the Herbstlabyrinth cave system, Central Germany. All stalagmites were precisely dated using MC-ICPMS 230Th/U-dating. One stalagmite started to grow at 13.62 ± 0.13 ka BP, covering the late Glacial; the other two speleothems started to grow at 11.13 ± 0.08 and 10.26 ± 0.08 ka BP, respectively. The combined record covers the entire Holocene. The interpretation of the different climate proxies is supported by data from a detailed cave monitoring programme. Cold conditions during the Younger Dryas are reflected by intermittent stalagmite growth at the Herbstlabyrinth. The δ18O records are in general agreement with the NGRIP δ18O record on millennial time scales indicating that speleothem δ18O values at the Herbstlabyrinth reflect large-scale climate variability in the North Atlantic area. The 8.2 ka event is clearly visible as a pronounced negative excursion in the δ18O records. In all other proxies, it is not reflected as a major excursion. Correlation and principal component analysis enable us to disentangle the various processes affecting the stable isotope and trace element signals. Phases with higher P, Ba and U concentrations and more negative δ13C values are interpreted as reflecting more productive vegetation above the cave. The negative correlation of Mg with P, Ba and U and the positive correlation with δ13C indicate more recharge during phases of more productive vegetation, probably because of increased rainfall. The majority of the observed phases of reduced vegetation productivity and drier climate coincide with cooler periods in the polar North Atlantic as reflected by a higher abundance of hematite-stained grains (i.e. the Bond events), suggesting a close relationship between terrestrial climate in Central Europe and the polar North Atlantic.