论文标题
从德国的三个speleothems重建的8.2 KA事件的气候和结构
Climate and structure of the 8.2 ka event reconstructed from three speleothems from Germany
论文作者
论文摘要
全新世最明显的气候异常是8.2 KA冷却事件。我们提供了新的230/U-AGES以及来自德国两个不同的洞穴系统的三个阶层的高分辨率稳定同位素和跟踪元素数据，这些数据提供了有关中欧8.2 KA事件的结构和气候变化的重要信息。在所有三个speleothems中，8.2 ka事件清楚地记录为Δ18O值的明显负偏移，并且可以分为“整个事件”和“中心事件”。所有的石匠都显示了事件的类似结构，在“中央事件”之前，有简短的负面游览，这标志着“整个事件”的开始。 8.2.ka事件的时间和持续时间在单个记录中有所不同，但是，这可能与约会不确定性有关。在事件期间，来自Bunker洞穴的Stalagmite Bu4在Δ13C值和Mg含量中也显示出负异常，而Herbstlabyrinth洞穴系统的两个speleothems在其他代理中并未显示出不同的峰。这可能表明，记录在三个石灰石中的speleothemΔ18O值主要反映了洞穴位置的气候变化，而是北大西洋的大规模变化。这是通过与气候建模数据进行比较来支持的，这表明Speleothemδ18O值中的负峰主要是由于较低的腔降水值高于洞穴的降水值，并且该温度仅起作用。或者，其他代理可能不像Δ18O值那样敏感，无法记录这个百年纪念尺度的冷却事件。与气候建模研究相比，在8.2 ka事件期间模拟欧洲的植被变化所建议的speleothemΔ13c值可能尤其如此。 ...
The most pronounced climate anomaly of the Holocene was the 8.2 ka cooling event. We present new 230Th/U-ages as well as high-resolution stable isotope and trace element data from three stalagmitesfrom two different cave systems in Germany, which provide important information about the structure and climate variability of the 8.2 ka event in central Europe. In all three speleothems, the 8.2 ka event is clearly recorded as a pronounced negative excursion of the δ18O values and can be divided into a 'whole event' and a 'central event'. All stalagmites show a similar structure of the event with a short negative excursion prior to the 'central event', which marks the beginning of the 'whole event'. The timing and duration of the 8.2.ka event are different for the individual records, which may, however, be related to dating uncertainties. Whereas stalagmite Bu4 from Bunker Cave also shows a negative anomaly in the δ13C values and Mg content during the event, the two speleothems from the Herbstlabyrinth cave system do not show distinct peaks in the other proxies. This may suggest that the speleothem δ18O values recorded in the three stalagmites do not primarily reflect climate change at the cave site, but rather large-scale changes in the North Atlantic. This is supported by comparison with climate modelling data, which suggest that the negative peak in the speleothem δ18O values is mainly due to lower δ18O values of precipitation above the cave and that temperature only played a minor role. Alternatively, the other proxies may not be as sensitive as δ18O values to record this centennial-scale cooling event. This may particularly be the case for speleothem δ13C values as suggested by comparison with a climate modelling study simulating vegetation changes in Europe during the 8.2 ka event. ...
