Russian Journal of Earth Sciences Russian Journal of Earth Sciences Russian Journal of Earth Sciences 1681-1208 50758 10.2205/2023ES000842 GAAKBE ОРИГИНАЛЬНЫЕ СТАТЬИ ORIGINAL ARTICLES ОРИГИНАЛЬНЫЕ СТАТЬИ Consistency of Intra-Centennial Oscillations in Length of Day and Oceanic Characteristics Consistency of Intra-Centennial Oscillations in Length of Day and Oceanic Characteristics https://orcid.org/0000-0001-6781-6838 Безверхний Вячеслав Алексеевич Bezverhniy Viacheslav Alekseevich vabezv@mail.ru

кандидат физико-математических наук;кандидат физико-математических наук;кандидат физико-математических наук;

candidate of physical and mathematical sciences;candidate of physical and mathematical sciences;candidate of physical and mathematical sciences;

 https://orcid.org/0000-0003-3224-1012 Груздев Александр Николаевич Gruzdev Aleksandr Nikolaevich a.n.gruzdev@mail.ru

доктор физико-математических наук;

doctor of physical and mathematical sciences;

 Институт физики атмосферы им. А. М. Обухова РАН Россия A. M. Obukhov Institute of Atmospheric Physics of Russian Academy of Sciences Russian Federation Институт физики атмосферы им. А. М. Обухова РАН Россия A. M.Obukhov Institute of Atmospheric Physics Russian Academy of Sciences Russian Federation 10 12 2023 10 12 2023 23 4 1 15 03 06 2022 07 04 2023 https://rjes.ru/en/nauka/article/50758/view

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.

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.

 length of day sea surface temperature sea level intra-centennial oscillations This work was based on freely downloaded datasets from the International Earth Rotation and Reference Systems, the Commonwealth Scientific and Industrial Research Organisation (CSIRO), the Universität Siegen, Gemany, the Met Office Hadley Centre. the NOAA Physical Sciences Laboratory, the World Data Center SILSO, Royal Observatory of Belgium, the International Service of Geomagnetic Indices and the NASA Goddard Institute for Space Studies. The authors are grateful to the two anonymous reviewers for useful comments.

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