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《Journal of Glaciology and Geocryology》 2009-06
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Multi-Scale Analysis of the Last Millennium Climate Variations in Greenland Derived from Ice Core Oxygen Isotope

YU Ming-tong1,2,LIN Zhen-shan1,DU Jian-li1,ZHANG Zhen-zhen1 (1. College of Geography Science,Nanjing Normal University,Nanjing Jiangsu 210046,China; 2. College of Geography Sciences,Fujiang Normal University,Fuzhou Fujian 350007,China)  
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 activities. The oscillation of intrinsic mode function IMF7,IMF8 and their tendency appear an obviously transforming in 1350 AD,which indicate that 1350 AD can be considered as the boundary between WMP and LIA. The results give more detailed changes and phases of millennium climate change in the high latitude areas of the Northern Hemisphere.
【Fund】: 教育部博士点基金项目(20060139010)资助
【CateGory Index】: P467
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