日长和海洋特征的百年内振荡的一致性

IF 0.7 Q4 GEOSCIENCES, MULTIDISCIPLINARY
Viacheslav Bezverhniy, Aleksandr Gruzdev
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引用次数: 0

摘要

本文分析了日长(LOD)和一些海洋参数如海温(SST)和海平面(SL)的百年内(年代际和多年代际)变化。采用多元回归分析和相关分析方法。回归分析结果表明,在多年代际时间尺度上,海表温度对LOD变化具有空间相干响应。早前的响应是北大西洋和热带大西洋所特有的,那里的海温多年代际变化与LOD变化大致相反。除了赤道东太平洋的Nino 3.4区域外,其余大部分海域海温的多年代际变化总体滞后于LOD的反相变化。对不同地区平均海温和全球平均海温进行平滑处理表明,年际变化包括年代际、20 - 30年、多年代际、60 - 70年等分量,这些分量与LOD中相似的振荡分量相对应。两个分量最显著的对应关系是在Nino 3.4区域的LOD和平均海温之间。总体而言,平均和平滑海温序列和全球平均海温的百年内变化与LOD变化具有显著的相关性。我们认为,涉及海洋环流和地核与地幔相互作用的角动量交换过程可能是观测到的海洋参数百年内变化与LOD变化关系的一部分。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Consistency of Intra-Centennial Oscillations in Length of Day and Oceanic Characteristics
The paper presents analysis of intra-centennial (inter-decadal and multidecadal) variations of the length of day (LOD) and some oceanic parameters such as sea surface temperature (SST) and sea level (SL). Methods of multivariate regression analysis and correlation analysis are used. Results of the regression analysis show a spatially coherent response of SST to LOD variations on the multidecadal time scale. The earlier response is peculiar to the north and tropical Atlantic where the multidecadal SST variations are approximately opposite to the LOD variations. In the most remaining parts of the oceans, except especially in the Nino 3.4 region of the equatorial east Pacific, the multidecadal SST variations are generally lagged relative to the antiphase variations of the LOD. Smoothing of SST averaged over different areas and of the global mean SL shows that the intra-annual variations include inter-decadal, 20–30-year, multidecadal, 60–70-year, components that correspond to similar oscillation components in the LOD. The most striking correspondence of the two components is observed between the LOD and SST averaged over the Nino 3.4 region. Generally, there are significant correlations of the intra-centennial variations on the averaged and smoothed SST series and global mean SL with the LOD variations. We propose that angular momentum exchange processes involving oceanic circulation and interactions between the Earth’s core and the mantle play probably a part in the observed relationships of intra-centennial variations in oceanic parameters with variations in the LOD.
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来源期刊
Russian Journal of Earth Sciences
Russian Journal of Earth Sciences GEOSCIENCES, MULTIDISCIPLINARY-
CiteScore
1.90
自引率
15.40%
发文量
41
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