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首页> 外文期刊>Pure and Applied Geophysics >Search for Solar Periodicities in Tree-ring Widths from Concórdia (S.C., Brazil)
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Search for Solar Periodicities in Tree-ring Widths from Concórdia (S.C., Brazil)

机译：从Concórdia（巴西南卡罗来纳州）搜索年轮宽度中的太阳周期性

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Tree ring studies are usually used to determine or verify climatic factors prevailing at a given place or region that may cause tree-ring width variations. Few studies are dedicated to the solar phenomena which may underlie these tree-ring width variations. Furthermore, it is known that some terrestrial phenomena are influenced by short- and long-time scale solar variability. An optical and computational method was set up and applied to tree samples (Araucaria angustifolia from Santa Catarina State in Southern Brazil) in order to obtain a growth ring width mean chronology. Spectral analysis is used for the search of periodicities, by maximum entropy and iterative regression methods. The results evidenced several embedded signals at periods which may be related to solar activity variations. Cross-correlation analysis between sunspot number and tree-ring data was performed and a lag of zero year was obtained. From our work, it seems that the tropical conifer species Araucaria angustifolia may be a good choice for studies on Sun-Earth relationships and their regional effects.
机译：树木年轮研究通常用于确定或验证在给定位置或区域中可能导致树木年轮宽度变化的主要气候因素。很少有研究致力于太阳现象，这些现象可能是这些年轮宽度变化的基础。此外，已知一些陆地现象会受到短期和长期尺度太阳变化的影响。建立了一种光学和计算方法，并将其应用于树木样品（巴西南部圣卡塔琳娜州的南洋杉），以获取年轮宽度平均年表。频谱分析用于通过最大熵和迭代回归方法搜索周期性。结果证明了在某些时段可能与太阳活动变化有关的嵌入式信号。进行了黑子数与年轮数据之间的互相关分析，得出了零年的滞后。从我们的工作看来，热带针叶树种南洋杉可能是研究日地关系及其区域效应的好选择。

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