On the interconnections among major climate modes and their common driving factors
On the interconnections among major climate modes and their common driving factors
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论主要气候模式之间的相互联系及其共同驱动因素
DOI：
10.5194/esd-2019-74
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发表时间：
2019-11
影响因子：
7.3
通讯作者：
Anastasios A. Tsonis
中科院分区：
文献类型：
--
作者：
Xinnong Pan;Geli Wang;Peicai Yang;Jun Wang;Anastasios A. Tsonis
抽象的。不同时间尺度上海洋和大气模式的变化在产生全球和区域气候变化方面发挥着重要作用。许多努力致力于确定气候模式变化与区域气候变率之间的关系，但很少探讨这些气候模式之间的相互关系。这里我们用气候指数来表示主要气候模式的变化，并利用慢特征分析（SFA）和小波分析来检验气候模式驱动力之间的调和关系。我们发现，气候指数中驱动力信号的所有重要峰值周期都可以表示为四个基期的谐波：2.32、3.90、6.55 和 11.02 年。我们推断 2.32 年的周期与准两年振荡 (QBO) 信号相关。 3.90 和 6.55 年的周期与厄尔尼诺-南方涛动 (ENSO) 的内在变化有关，11.02 年的周期则由太阳黑子周期产生。结果表明，基期及其与 QBO、ENSO 和太阳活动相关的谐波振荡是具有同步行为的气候模式之间的关键联系，凸显了这三种振荡在地球气候变化中的重要作用。亮点。我。利用慢特征分析和小波分析研究了气候模式驱动力之间的调和关系。气候指数中驱动力信号的所有显着峰值周期都可以表示为四个基周期的谐波。与 QBO、ENSO 和太阳活动相关的四个基期是具有同步行为的不同气候模式之间的关键联系。
Abstract. The variations in oceanic and atmospheric modes on various timescales play important roles in generating global and regional climate variability. Many efforts have been devoted to identifying the relationships between the variations in climate modes and regional climate variability, but these have rarely explored the interconnections among these climate modes. Here we use climate indices to represent the variations in major climate modes and examine the harmonic relationship among the driving forces of climate modes using slow feature analysis (SFA) and wavelet analysis. We find that all of the significant peak periods of driving-force signals in the climate indices can be represented as harmonics of four base periods: 2.32, 3.90, 6.55, and 11.02 years. We infer that the period of 2.32 years is associated with the signal of the quasi-biennial oscillation (QBO). The periods of 3.90 and 6.55 years are linked to the intrinsic variability of the El Niño–Southern Oscillation (ENSO), and the period of 11.02 years arises from the sunspot cycle. Results suggest that the base periods and their harmonic oscillations related to QBO, ENSO, and solar activities act as key connections among the climatic modes with synchronous behaviors, highlighting the important roles of these three oscillations in the variability of the Earth's climate. Highlights. i. The harmonic relationship among the driving forces of climate modes was investigated by using slow feature analysis and wavelet analysis.ii. All of the significant peak periods of driving-force signals in climate indices can be represented as the harmonics of four base periods.iii. The four base periods related to QBO, ENSO, and solar activities act as the key linkages among different climatic modes with synchronous behaviors.
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