全球新仙女木事件的恢复及其触发机制研究进展

Progress in Studies on the Younger Dryas Event and Its Trigger Mechanisms

大约发生在12.9～11.6 ka BP的新仙女木事件（YD）在气候突变的研究中占有重要地位, 然而对其触发时间、触发地点、触发机制以及YD事件是否是一个全球性的事件一直存在很大争议, 并且该事件触发机制的研究对目前全球温度快速升高背景下未来气候变化的预测也有很大的意义.综述了近年来世界范围内YD事件恢复的最新研究, 分析了该事件在全球不同区域发生时间和强度的异同, 目前北半球对该事件的记录比较一致, 南半球还有很大分歧.介绍了YD事件的可能触发机制, YD事件的触发除了北大西洋温盐环流终止之外, 也可能受到诸如太阳辐射减少和赤道大洋的影响.最后讨论了有待加强的研究区域和未来的研究方向.

As the latest abrupt climate event with temperature decrease from the transition of the last glacial period to the Holocene, the Younger Dryas （YD） event that occurred approximately between 12.9 to 11.6 ka BP at north Atlantic is very important on the study of abrupt climate change, while there are still many debates on its trigger site, trigger time, trigger mechanism, as well as whether it is a global event. Furthermore, study on the trigger mechanism of YD event has important value on forecasting future climate change under the background of a continuous global warming at present time. In this paper the current studies on the YD event around the world are reviewed, and the diversities and similarities of its time and intensity in different regions are analyzed. The records of north hemisphere are consistent at some extent, while those of south hemisphere still have many divaricating. Also the possible trigger mechanisms of YD event suggested in recent years are introduced. Generally there are three kinds of mechanisms： the stagnation of thermohaline circulation （THC）, the variations of solar radiation and Equatorial Ocean may also contribute to the occurrence of YD event. At last, the regions which need to be further studied and the future focuses on YD have been discussed.