European Climatic Response to Millennial-Scale Changes in the Atmosphere–Ocean System during the Last Glacial Period
European Climatic Response to Millennial-Scale Changes in the Atmosphere–Ocean System during the Last Glacial Period
复制标题
末次冰河期欧洲气候对大气-海洋系统千年尺度变化的反应
作者：
M. F. S. Goñi;J. Turon;F. Eynaud;S. Gendreau
对位于伊比利亚半岛西南边缘的MD95-2042海相末冰期剖面进行了花粉、有孔虫、藻囊和粗岩屑的高分辨率分析和δ18O测量。花粉数据表明，在此期间，邻近大陆的植被变化频率很高，表明气候变化与格陵兰冰芯记录的Dansgaard-Oeschger旋回非常相似。MD95-2042岩芯陆地和海洋代用资料的详细直接对比表明，海因里希事件在陆地和海洋环境中具有三相模式。H5和H4事件的第一阶段和最后阶段以欧洲西南部温和湿润的气候为特征，这可能与冰筏碎屑的欧洲起源有关。中期阶段，伊比利亚的气候寒冷干燥，与冰筏碎屑的最大输入有关。这一阶段似乎与劳伦泰德冰原的涌动相对应。在海因里希事件之间，陆地上的几个寒冷和干燥时期与Dansgaard-Oeschger旋回的阶段有关。Dansgaard-Oeschger风暴对欧洲西南部的影响似乎优先与到达中纬度地区的寒冷冬季气团有关。
Pollen, foraminifer, dinocyst, and coarse lithic high-resolution analyses and δ18O measurements have been carried out for the last-glacial section of marine core MD95-2042 located near the southwestern margin of the Iberian Peninsula. The pollen data indicate a high frequency of vegetational changes on the adjacent continent during this period, suggesting a climatic variability very similar to that of the Dansgaard-Oeschger cycles recorded by the Greenland ice cores. The detailed direct correlation of the terrestrial and marine proxy data from core MD95-2042 indicates a three-phase pattern of Heinrich events in land and ocean environments. The first and last phases of the H5 and H4 events are characterized by a mild and humid climate in southwestern Europe, probably associated with the European origin of the ice-rafted detritus. The middle phase exhibits a cold and dry climate in Iberia linked with the maximum input of ice-rafted detritus. This phase seems to correspond with the Laurentide ice-sheet surges. Between the Heinrich events, several cold and dry periods on land are correlated with stades of the Dansgaard-Oeschger cycles. The impact of the Dansgaard-Oeschger stades in southwestern Europe seems to be preferentially connected to the cold winter air masses reaching this mid-latitude region.