Interannual variations in length of day with respect to El Niño - Southern Oscillation’s impact (1962–2015)
Interannual variations in length of day with respect to El Niño - Southern Oscillation’s impact (1962–2015)
复制标题
厄尔尼诺-南方涛动影响的白昼长度的年际变化（1962-2015）
DOI：
10.1007/s12517-017-3049-2
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发表时间：
2017
影响因子：
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通讯作者：
A. Bonaduce
中科院分区：
文献类型：
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作者：
M. Haddad;A. Bonaduce
本研究的目的是检查日长的变化，并调查其与ENSO（厄尔尼诺-南方涛动）事件的关系。为此，LOD时间序列（1962-2015），从国际地球自转和参考系服务（IERS），使用奇异谱分析（SSA）技术进行了研究。结果表明，LOD时间序列非常复杂，由几个分量组成：长期趋势解释了95.97%的原始序列，年调和1.76%和半年1.35%。考虑到Niño 3、Niño 4和Niño3.4区域的海表温度距平（SSTA）指数、南方涛动指数（SOI）和多变量ENSO指数（MEI），残差信号仅占初始LOD序列的0.92%，表明1965-66、1972-73、1972- 74、1972- 75和1973年与ENSO有显著的相关性。1982-83年和1997-98年厄尔尼诺事件以及1970-71年、1973-74年、1988-89年、2007-08年、2010-11年拉尼娜事件。这是一个相关的结果，表明LOD变异至少部分与ENSO现象有关。
The objective of research done in this study is to examine the variability of the length of day (LOD) and to investigate its correlation with ENSO (El Niño-Southern oscillation) episodes. For this purpose, the LOD time series (1962–2015), from the International Earth Rotation and Reference Systems Service (IERS), is investigated using the Singular Spectrum Analysis (SSA) technique. The results show that the LOD time series is very complex and is composed of several components: the long-term trend explains 95.97% of the original series, the annual harmonic 1.76% and the semi-annual 1.35%. Considering sea surface temperature anomalies (SSTA) index over the Niño3, Niño4 and Niño3.4 regions, Southern Oscillation Index (SOI) and Multivariate ENSO Index (MEI), the residuals signal, that represents only 0.92% of the initial LOD series, indicate a significant correlation with ENSO occurred during 1965–66, 1972–73, 1982–83 and 1997–98 El Niño events and 1970–71, 1973–74, 1988–89, 2007–08, 2010–11 La Niña ones. This is a pertinent result that suggests that LOD variability is at least partly related to ENSO phenomena.