格陵兰冰芯氧同位素显示近千年气候变化的多尺度分析  

Multi-Scale Analysis of the Last Millennium Climate Variations in Greenland Derived from Ice Core Oxygen Isotope

作　　者：俞鸣同[1,2] 林振山[1] 杜建丽[1] 张真真[1] 

机构地区：[1]南京师范大学地理科学学院,江苏南京210046 [2]福建师范大学地理科学学院,福建福州350007

出　　处：《冰川冻土》2009年第6期1037-1042,共6页Journal of Glaciology and Geocryology

基　　金：教育部博士点基金项目(20060139010)资助

摘　　要：用经验模态分解(EMD)方法对格陵兰冰盖GISP2冰芯古气候代用指标δ18O序列进行分解,结果表明:格陵兰近10ka来气候变化总趋势出现历时约490a的中世纪暖期和历时约570a的小冰期,其间还存在次级的冷暖期变化;气候波动具有3a、6.5a、12a、24a、49a、96a、213a、468a准周期,既有NESO的因素,也受制于太阳活动周期的影响.第7,第8内在模函数(IMF7,IMF8)波动振幅以及总体趋势分量res在1350A.D.出现明显的转型,表明1350A.D.为中世纪暖期和小冰期的分界.The Empirical Mode Decomposition is used for analyzing the paleoclimate proxy δ18O from Greenland GISP2 ice core. The results show that the trend of millennium climate change in Greenland emerges a Medieval Warm Period (WMP) lasting for about 490 years and a Little Ice Age (LIA) of about 570 years,during which there are also sub cooling-warming changes. Its multi-scale oscillations changed with quasi-periods of 3 a,6.5 a,12 a,24 a,49 a,96 a,213 a and 468 a,not only affected by ENSO but also by solar activit...

关 键 词：经验模态分解 中世纪暖期和小冰期 波动周期 

分 类 号：P467[天文地球—大气科学及气象学]