Multi-scale analysis on last millennium climate variations in Greenland by its ice core oxygen isotope  

作　　者：MingTong Yu ZhenShan Lin JianLi Du ZhenZhen Zhang 

机构地区：[1]College of Geography Science,Nanjing Normal University,Nanjing 210046,Jiangsu,China [2]College of Geography,Fujian Normal University,Fuzhou 350007,Fujian,China [3]College of Geography Science,Nanjing Normal University,Nanjing 210046,Jiangsu,China

出　　处：《Research in Cold and Arid Regions》2010年第2期123-128,共6页寒旱区科学（英文版）

基　　金：supported by Doctor's Project Foundation (No. 20060139010) of Education Administration

摘　　要：The empirical mode decomposition method is used for analyzing the paleoclimate proxy δ18O from Greenland GISP2 ice core.The results show that millennium climate change trends in Greenland record the Medieval Warm Period (MWP) from 860AD-1350AD lasting for about 490 years,and the Little Ice Age (LIA) from 1350AD-1920AD lasting about 570 years.During these events,sub cooling-warming variations occurred.Its multi-scale oscillations changed with quasi-period of 3-year,6.5-year,12-year,24-year,49-year,96-year,213-year and 468-year,and are not only affected by ENSO but also by solar activity.The oscillation of intrinsic mode function IMF7,IMF8 and their tendency obviously appear in 1350AD which is considered as the key stage of transformation between MWP and LIA.The results give more detailed changes and their stages of millennium climate change in high latitude areas of the Northern Hemisphere.

关 键 词：empirical mode decomposition medieval warm period and little ice age quasi-period of millennium climate oscillation 

分 类 号：P[天文地球]