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YD事件突变特征及其前兆信号
引用本文:黄沁昕,刘殿兵.YD事件突变特征及其前兆信号[J].福建地理,2013(4):47-52.
作者姓名:黄沁昕  刘殿兵
作者单位:南京师范大学地理科学学院,南京210023
基金项目:国家自然科学基金(41172148)、高等学校博士学科点专项科研基金(20113207120012)、江苏高校优势学科建设工程资助项目、南京师范大学高层次人才科研启动基金项目(2011105XGQ0102)南京师范大学地理科学学院孔兴功教授为本研究完成测试大量U/Th年龄,特此致谢!
摘    要:气候突变前兆信号对研究气候突变爆发方式、特征、细节过程以及未来气候预测有着极为重要的学术价值及社会意义.青天洞具有年纹层特征的石笋δ^18O记录显示,在新仙女木(YoungerDryas,YD)事件结束期间,季风约在11年内完成转型,但在结束前(11.64ka BP-11.54kaBP),季风变化存在2个数十年尺度次级波动,历时约97±7年.该期季风强度颤动与此前YD内部季风变化相比呈现低幅、高频特征,在整个过程中季风强度总体保持上升.且在11.59kaBP后显示出自相关增强.这些特征与最近洱海湖泊生态系统突变前频繁波动特征类似,说明高频、低幅波动可能反映不同动力系统接近其临界值,可作为突变的前兆信号.

关 键 词:季风突变  前兆信号  新仙女木事件

Abrupt Asian Monsoon Variability and Its Warning Signal at the End of Younger Dryas Event
HUANG Qin-xin,LIU Dian-bing.Abrupt Asian Monsoon Variability and Its Warning Signal at the End of Younger Dryas Event[J].Fujian Geography,2013(4):47-52.
Authors:HUANG Qin-xin  LIU Dian-bing
Institution:(School of Geography Science, Nanjing Normal University, Nanjing 210023, China)
Abstract:Climate warning signal is of scientific and societal importance to understand the mode, characteristics and details of abrupt climate changes and to predict climate evolution in the future. An annually counted stalagmite δ18O from Qingtian Cave shows that two decadal minor Asian monsoon oscillations are evident before the end of Younger Dryas (YD) event, lasting 97 ± years ( 11.64 ka BP 11.54 ka BP). These Asian monsoon flickerings, analogous to those high-frequency changes in the Erhai Lake ecosystem before critical transition, exhibit an increasing autocorrelation from 11.59 ka BP, which indicate that the dynamical system might reach its threshold, and the high-frequency, low-amplitude oscillations can be applied as warning signals for approaching such threshold.
Keywords:abrupt Asian monsoon changes  warning signal  Younger Dryas
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