How Does Temporal Resolution Influence Geomagnetic Reversal Statistics?

How Does Temporal Resolution Influence Geomagnetic Reversal Statistics?
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时间分辨率如何影响地磁反转统计?

DOI:
10.1029/2019gl082976
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发表时间:
2019
影响因子:
5.2
通讯作者:
Avery, M. S.
Avery, M. S.
中科院分区:
地球科学1区
文献类型:
--
作者:
Buffett, B.;Avery, M. S.

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从海洋磁异常的极性间隔表现出的变化,偏离泊松过程。短极性间隔的缺陷由形状参数k>1的威布尔分布很好地表示。从随机模型的极性间隔也服从威布尔分布,但形状参数控制的时间平均用于近似的海洋记录的分辨率。减少时间平均值得到的极性间隔可以用k <1的分布很好地描述,这表明海洋记录中缺少短极性间隔。当偶极场相对于时间平均值较弱时,通常在过渡态期间,预计所有这些缺失的极性间隔都会发生。我们将这些短极性间隔中的许多与过渡期间偶极符号的频繁变化相关联。这些短极性间隔应该在高分辨率的磁场方向观测中可以检测到。
Polarity intervals from marine magnetic anomalies exhibit variability that departs from a Poisson process. The deficit of short polarity intervals is well represented by a Weibull distribution with a shape parameterk>1. Polarity intervals from a stochastic model also obey a Weibull distribution, but the shape parameter is controlled by the temporal averaging used to approximate the resolution of the marine record. Reducing the time averaging yields polarity intervals that are well described by a distribution withk<1, suggesting that short polarity intervals are missing from the marine record. All of these missing polarity intervals are expected to occur when the dipole field is weak relative to the time average, often during transition states. We associate many of these short polarity intervals with frequent changes in the sign of the dipole during the transition. These short polarity intervals should be detectable in high‐resolution observations of magnetic directions.
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