洞穴石笋气候档案具有深海沉积等长尺度记录和树轮日历年两种不同气候载体的特征,开启了研究轨道尺度、千年尺度和年际气候变化三者联系的新窗口.本文主要回顾了近20年来亚洲季风区石笋的高精度定年和气候代用指标等研究进展.精确定年的石笋气候序列为米兰科维奇"轨道假说"解释低纬气候变化奠定了基础,并有可能深入了解突变气候事件的驱动机制.在此基础上,讨论了目前学术界普遍关心的"中国石笋δ^18O信号解释"问题,认为在千年尺度以上,石笋同位素序列反映了季风气候控制下的干/湿变化过程.跨越中布容事件的石笋记录有可能联系低纬岁差尺度水文循环与高纬冰盖过程,将冰盖、季风、温室气体和生物地球化学过程置于高精度年代框架下,研究其驱动与响应关系.最后指出,精确定年的石笋气候序列有可能成为大陆同位素气候层型,并在解决当代全球变暖机制问题上发挥重要作用.
In the last 20 years, speleothems have been increasingly applied in paleoclimate studies, and become one of the most important geologic records like oceanic sediments, loess deposits, and ice cores. Critically, the stalagmite archives from Asian monsoon(AM) area provide an insight into the mechanisms behind low-latitude precessional hydroclimate and abrupt AM changes in line with millennial-scale Greenland temperature variability. These climate records from the Asian continent interiors, well-duplicated over broad regions, extend back to 600 ka BP, and have been widely accepted as a North Hemisphere template for synchronizing global climate records. Here we review these independently- and precisely-dated stalagmite records from those climatically- and environmentally-sensitive locations and discuss various climate factors that control AM variability from annual to orbital time scales. As the speleothems are often annually laminated that extend back into a long growth history, it is possible to understand mechanisms of millennial- to annual-scale climate changes under different Earth's climatic boundaries. By nature, these calcite records are instrumental in resolving the climate background for natural variability of current climate, abrupt climate changes in the distant time, and even a prediction for future climate. As an important sub-system of global climate, the AM climate characterizes distinct seasonal cycle of wind directions, temperature, and precipitation. It can link tropical ocean processes and even the Southern Ocean via southerly air masses, and high northern latitudes through northerly air parcels. Hence, the AM record is ideal for evaluating the forcing-response correlation between hemispheric climates. On the basis of reviewing various stalagmite proxies(i.e., ?18 O, ?13 C, trace element, annual layer, fluid inclusions, etc.) for parameters of AM climate, we discuss a potential to understand sources and trajectories of AM circulations by use of the speleothem oxygen isotope over broa