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Decadal fluctuations in Earth's rotation as evidences of lithospheric drift over the asthenospereстатья
- Авторы: Sidorenkov N.S., Dionis E., Bizouard C., Zotov L.V.
- Сборник: Proceedings of Journees 2019
- Год издания: 2020
- Место издания: Paris Observatory
- Первая страница: 243
- Последняя страница: 247
- Аннотация: The decadal instabilities in Earth’s rotation (DIER) are thought to be caused bythe interactions between the Earth’s core and its mantle. This hypothesis successfully explains whythere is a close correlation between DIER and the variations in the rate of the westward drift of thegeomagnetic eccentric dipole, since it is successfully reproduced by modeling of the redistribution ofthe angular momentum between the fluid core and the mantle of the Earth. However, the hypothesiscan not explain the close correlations of DIER: with the observable variations in the masses of theAntarctic and Greenland ice sheets; with the decade oscillations of the types of synoptic processes(i.e. the epochs of the atmospheric circulation); with the anomalies of the global temperature;and with regional anomalies of the cloudiness, precipitations, and other climatic characteristics. Analternative to the core-mantle interaction hypothesis is presented here. This alternative hypothesisclaims that the DIER are actually caused by fluctuations in the angular velocity of lithospheric driftover the asthenosphere. The sliding of the lithosphere over the asthenosphere is possible due to ofthe vibrational displacement mechanism produced by tidal forces. The lithospheric plates exhibitvibrational displacements over the asthenosphere in the horizontal direction by shear stresses causedby friction, wind, and ocean currents. There is abundant evidence supporting this lithospheric driftmodel.
- Добавил в систему: Зотов Леонид Валентинович