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首页> 外文期刊>Nonlinear processes in geophysics >Wavelet analysis of the singular spectral reconstructed time series to study the imprints of solar-ENSO-geomagnetic activity on Indian climate
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Wavelet analysis of the singular spectral reconstructed time series to study the imprints of solar-ENSO-geomagnetic activity on Indian climate

机译：奇异谱重建时间序列的小波分析，以研究太阳-ENSO-地磁活动对印度气候的影响

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摘要

To study the imprints of the solar-ENSO-geomagnetic activity on the Indian subcontinent, we have applied singular spectral analysis (SSA) and wavelet analysis to the tree-ring temperature variability record from the Western Himalayas. Other data used in the present study are the solar sunspot number (SSN), geomagnetic indices (aa index), and the Southern Oscillation Index (SOI) for the common time period of 1876-2000. Both SSA and wavelet spectral analyses reveal the presence of 5-7-year short-term ENSO variations and the 11-year solar cycle, indicating the possible combined influences of solar-geomagnetic activities and ENSO on the Indian temperature. Another prominent signal corresponding to 33-year periodicity in the tree-ring record suggests the Sun-temperature variability link probably induced by changes in the basic state of the Earth's atmosphere. In order to complement the above findings, we performed a wavelet analysis of SSA reconstructed time series, which agrees well with our earlier results and increases the signal-to-noise ratio, thereby showing the strong influence of solar-geomagnetic activity and ENSO throughout the entire period. The solar flares are considered responsible for causing the atmospheric circulation patterns. The net effect of solar-geomagnetic processes on the temperature record might suggest counteracting influences on shorter (about 5-6-year) and longer (about 11-12-year) timescales. The present analyses suggest that the influence of solar activities on the Indian temperature variability operates in part indirectly through coupling of ENSO on multilateral timescales. The analyses, hence, provide credible evidence of teleconnections of tropical Pacific climatic variability and Indian climate ranging from inter-annual to decadal timescales and also suggest the possible role of exogenic triggering in reorganizing the global Earth-ocean-atmospheric systems.
机译：为了研究印度次大陆上太阳-ENSO-地磁活动的印记，我们将奇异光谱分析（SSA）和小波分析应用于喜马拉雅西部的树木年轮温度变化记录。本研究中使用的其他数据是1876-2000年共同时期的太阳黑子数（SSN），地磁指数（aa指数）和南方涛动指数（SOI）。 SSA和小波频谱分析均显示存在5-7年的ENSO短期变化和11年的太阳周期，这表明太阳地磁活动和ENSO对印度温度的可能综合影响。另一个与树年轮记录中的33年周期相对应的突出信号表明，太阳温度变化的联系可能是由于地球大气基本状态的变化引起的。为了补充上述发现，我们对SSA重建的时间序列进行了小波分析，这与我们先前的结果非常吻合，并且增加了信噪比，从而显示了太阳地磁活动和ENSO在整个过程中的强烈影响。整个时期。太阳耀斑被认为是造成大气环流模式的原因。太阳地磁过程对温度记录的净影响可能表明抵消了对较短（约5-6年）和较长（约11-12年）时间尺度的影响。目前的分析表明，太阳活动对印度温度变化的影响部分是通过ENSO在多边时间尺度上的耦合间接地起作用的。因此，这些分析为热带太平洋气候变化和印度气候从年际到年代际尺度的遥相关提供了可靠的证据，并且还提出了外源触发在重组全球地球-海洋-大气系统中可能发挥的作用。

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