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【求助】具有20a周期变化的气候系统有哪些？
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最近我用红色噪声功率谱分析了一个500a的时间序列数据，结果它只有一个非常显著的准20a的周期，不知该怎么解释它，查了一些文献，知道NAO/AO似乎有类似的周期，但也不是最显著的，所以想请教一下，北半球通常具有20a周期的气候系统有哪些？ [ Last edited by wbaishi on 2008-12-19 at 12:29 ] |
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2楼2008-02-28 16:22:14
3楼2008-02-28 22:45:07
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Swinson DB, Koyama H, Saito T. 1986. Long-term variations in north-south asymmetry of solar activity. Solar Physics 106(1): 35-42. Abstract This paper reports the results of a study of the N-S asymmetry in the flare index using the results of Knoscaronka (1985) combined with our results for the solar cycles 17 to the current cycle 22. By comparing the time-variation of the asymmetry curve with the solar activity variation of the 11-year cycle, we have found that the flare index asymmetry curve is not in phase with the solar cycle and that the asymmetry peaks during solar minimum. A periodic behaviour in the N-S asymmetry appears: the activity in one hemisphere is more important during the ascending part of the cycle whereas during the descending part the activity becomes more important in the other hemisphere. The dominance of flare activity in the southern hemisphere continues during cycle 22 and, according to our findings, this dominance will increase gradually during the following cycle 23. |
4楼2008-02-29 10:17:27
5楼2008-02-29 12:53:57
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