Is There a Tectonically Driven Supertidal Cycle?.

Green, J. A. M., Molloy, J. L., Davies, H. S. and Duarte, J. C. (2018) Is There a Tectonically Driven Supertidal Cycle?. Geophysical Research Letters, 45 (8). pp. 3568-3576. DOI 10.1002/2017GL076695.

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Earth is 180 Myr into the current supercontinent cycle, and the next supercontinent is predicted to form in 250 Myr. The continuous changes in continental configuration can move the ocean between resonant states, and the semidiurnal tides are currently large compared to the past 252 Myr due to tidal resonance in the Atlantic. This leads to the hypothesis that there is a “supertidal” cycle linked to the supercontinent cycle. Here this is tested using new tectonic predictions for the next 250 Myr as bathymetry in a numerical tidal model. The simulations support the following hypothesis: a new tidal resonance will appear 150 Myr from now, followed by a decreasing tide as the supercontinent forms 100 Myr later. This affects the dissipation of tidal energy in the oceans, with consequences for the evolution of the Earth‐Moon system, ocean circulation and climate, and implications for the ocean's capacity of hosting and evolving life.

Document Type: Article
Keywords: supercontinent cycle, tidal evolution
Refereed: Yes
Open Access Journal?: No
Publisher: AGU (American Geophysical Union), Wiley
Projects: FLOWS, Enrichment
Date Deposited: 04 May 2018 12:12
Last Modified: 08 Feb 2021 07:37

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