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| 基于EEMD的太阳活动对印度夏季风的多尺度胁迫分析 | |
| 引用本文： | 李玉霞,陈玲玲,江亭桂,罗文,林振山.基于EEMD的太阳活动对印度夏季风的多尺度胁迫分析[J].地理科学,2018,38(4):628-635. |
| 作者姓名： | 李玉霞 陈玲玲 江亭桂 罗文 林振山 |
| 作者单位： | 1.南京师范大学地理科学学院,江苏 南京210023 2.江苏省环境演变与生态建设重点实验室（南京师范大学）,江苏 南京 210023 3.江苏省地理环境演化国家重点实验室培育建设点,江苏 南京 210023 4.江苏省地理信息资源开发与利用协同创新中心,江苏 南京 210023 5.金陵科技学院人文学院,江苏 南京 211169 |
| 基金项目： | 国家自然科学基金项目（41601417）,江苏省高校优势学科建设工程资助项目（164320H116）资助 |
| 摘 要： | 选取10.55~2.7 kaBP Qunf洞的Q5石笋δ18O记录作为印度夏季风的代用指标,集合经验模态分解（EEMD）多尺度分析结果揭示了印度夏季风的强弱变化和与亚洲季风减弱事件的一致性,进一步讨论了11 kaBP以来印度夏季风的逐渐增强而后减弱的发展态势。选用同时期的古树年轮14C记录作为太阳活动代用指标,调频、调幅分析结果发现印度夏季风的31 a、70 a和7 860 a尺度分量受太阳活动相应分量的调频胁迫较为显著;同时又揭示出“太阳活动71 a周期-印度夏季风31 a周期”“太阳活动1 379 a周期-印度夏季风142 a周期”和“太阳活动2 376 a周期-印度夏季风733 a周期”三对调幅胁迫。 |
| 关 键 词： | EEMD 印度夏季风 太阳活动 调频胁迫 调幅胁迫 |
| 收稿时间： | 2017-04-27 |
| 修稿时间： | 2017-08-20 |
Multi-scale Modulation Analysis of Solar Activity and Indian Summer Monsoon Based on EEMD Method |
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| Yuxia Li,Lingling Chen,Tinggui Jiang,Wen Luo,Zhenshan Lin.Multi-scale Modulation Analysis of Solar Activity and Indian Summer Monsoon Based on EEMD Method[J].Scientia Geographica Sinica,2018,38(4):628-635. | |
| Authors: | Yuxia Li Lingling Chen Tinggui Jiang Wen Luo Zhenshan Lin |
| Abstract: | Recent analysis of the multi-scale incidence relation between the Indian summer monsoon(ISM) and the solar activity is relatively poor, which makes the research on the driving mechanism of the ISM cannot go further. To solve this problem, the multi-scale fluctuation characteristics of the ISM was analyzed based on the Ensemble Empirical Mode Decomposition (EEMD) method. Furthermore, based on the amplitude modulation method, the frequency modulation and amplitude modulation forcing by solar activity on ISM is analyzed. Finally, the driving mechanism of ISM was discussed. We selected the δ18O record of Q5 stalagmite from Qunf cave which covers 10.55-2.7 kaBP period as proxy of ISM, the EEMD multi-scale analysis results reveals that the weakened event of ISM is correlated with the Asian monsoon, furthermore, the trend component shows that the development procedure of ISM increased first and then decreased gradually since 11 kaBP. The 14C records of ancient tree rings was selected as solar activity proxy, frequency modulation and amplitude modulation analysis results showed that the ISM components on the scale of 31 years, 70 years and 7 860 years were significantly forced by the frequency modulation of solar activity components on the corresponding scale. Meanwhile, it revealed that there were three pairs of amplitude modulations: the cycles between 71 years of solar activity and 31 years of ISM, the cycles between 1 379 years of solar activity and 142 years of ISM, and the cycles between 2 376 years of solar activity and 733 years of ISM. |
| Keywords: | EEMD Indian summer monsoon solar activity frequency modulation amplitude modulation |
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