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地理科学  2009 

树轮资料(1511~1954)太阳活动的多尺度分析——EMD方法的应用

, PP. 709-714

Keywords: 树轮14 C,EMD,准波动周期,太阳活动极小期,趋势

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Abstract:

用EMD对Stuiver等提供的树轮14C资料进行分析,结果为①得到太阳活动的准3、6、11、22、44、110、200、300a的周期;从趋势项中可以得到准600a甚至更长的周期波动;②可以判断太阳活动经典的极小期,与公认的极小期有一定的滞后性。从树轮14C含量的变化趋势中可以判断从1954~2100年的太阳活动变化逐渐变强,从2100~2350年太阳活动逐渐开始变弱;③从每个尺度周期波动的时变特征中可以得到,即使在太阳活动的极小期,太阳活动依然存在频率和强度不同的周期波动。

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