Interaction of Large-scale Oceanic Currents and the Earth’s Wobble

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Naghibi, Elnaz | 2018

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Type of Document: Ph.D. Dissertation
Language: Farsi
Document No: 50498 (08)
University: Sharif University of Technology
Department: Mechanical Engineering
Advisor(s): Jalali, Abbas; Behzad, Mehdi
Abstract:
In this thesis, we investigate interactions of a double-gyre in the North Atlantic and the earth’s Chandler wobble using a single-layer ocean model based on depth-averaged Navier-Stokes equations and multiple-scale spectral solutions to it. The overall transfers of energy and angular momentum from the double-gyre to the Chandler wobble are used to calibrate the turbulence parameters of the idealized ocean model and Smagorinsky eddy viscosity is used to estimate turbulent diffusion terms. Our model is tested against a multilayer quasi-geostrophic ocean model in turbulent regime, and base states used in parameter identification are obtained from mesoscale eddy resolving numerical simulations. The Chandler wobble excitation function obtained from the model predicts a small role of North Atlantic Ocean region on the wobble dynamics as compared to all oceans, in agreement with the existing observations. Furthermore, the coupled model of Chandler wobble and oceanic double-gyre shows that the feedback effect of Chandler wobble on ocean dynamics is negligible for North Atlantic region
Keywords:
Chandler Wobble ; Galerkin Method in the Spectrum Domain ; Multiscale Modeling ; Meso-Scale Oceanic Currents ; Double-Gyre ; North Atlantic Ocean

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