博斯腾湖末次冰消期新仙女木事件的碳酸盐同位素记录(英文)

THE YOUNGER DRYAS COOLING EVENT REFLECTED BY CARBONATE ISOTOPIC DATA FROM BOSTEN LAKE SEDIMENT DURING LATE DEGLACIATION

新仙女木事件是发生于末次冰消期中的一次十分强烈的气候突然变冷事件，其突然性及全球性特征引起人们高度重视。根据新疆南疆博斯腾湖湖相沉积碳酸盐稳定同位素组成，同时结合孢粉及ＣａＣＯ３含量分析，揭示了新仙女木事件的存在。其记录表明，这一突变事件起止于约１１．０～１０．０ｋａＢ．Ｐ．，并于约１０．５ｋａＢ．Ｐ．前后达最甚，与欧洲及格陵兰以及我国东部和新疆北疆地区等基本一致。此期间，博斯腾湖地区气候特征以相对冷湿为主要特征。虽然这一全球性气候突变事件的成因机制目前还无法准确解释，但在新疆极端干旱的南疆地区发现此事件的存在，无疑会对深入理解此类气候突变事件的发生机理增添了新的材料。

One of the most dramatic climate change events is the Younger Dryas event(YD),a return to nearglacial conditions that punctuated the last deglaciation.Based on the lacustrine carbonate isotopic composition,sporopollen and CaCO 3 analyses,the most striking Younger Dryas cooling event during last deglaciation has been revealed.This record shows that both the onset and termination of the YD event occurred within 11 0～10 0kaB.P.,essentially corresponding with that of Europe and Greenland,during which climate was characterized by a cold and relatively humid regime.Although the mechanism for creating such abrupt and global event is not easily explained,the results obtained from southern Xinjiang,the aridest inland area in China,may provide some fresh insights into such abrupt climatic anomalies.