摘要
应用英国气象局哈德利气象研究中心(Hadley Center)及美国环境预报中心和国家大气研究中心(NCEP/NCAR)的海平面气压(Sea Level Pressure,SLP)资料归一化得出1850—2011年的东亚夏季风指数,利用经验模态分解(Empirical Mode Decomposition,EMD)方法对其变化特征进行分析,得到东亚夏季风指数的周期特征.太阳黑子活动与东亚夏季风活动存在相同的11年及80年左右周期,其中11年周期变化尤为明显.对比1850—2011年间太阳黑子数与东亚夏季风指数经验模态分解后的11年周期变化分量,发现两者波动振幅变化基本一致.
By application of normalization of the SLP data from Hadley and NCEP/NCAR,the East Asian Summer Monsoon(EASM) index from 1850 to 2011 are obtained.EMD method is adopted to analyze the periodic characteristics and get the EASM index cycles on various time scales.With three times analyses,the 11-year cycle component is obvious and has the highest correlation with the original data.Both the sunspot activity and the EASM activity have the same cycle component of 11-year and 80-year,especially the 11-year cycle component is obvious.With comparison between 11-year cycle component of sunspot number and that of EASM index,both of the fluctuation amplitude changes are basically identical.
出处
《空间科学学报》
CAS
CSCD
北大核心
2015年第1期50-55,共6页
Chinese Journal of Space Science
基金
国家重大科学研究计划项目资助(2012CB955200)
