Nonlinear Processes in Geophysical Fluid Dynamics: A tribute by Theodore G. Shepherd (auth.), O. U. Velasco Fuentes, J.

By Theodore G. Shepherd (auth.), O. U. Velasco Fuentes, J. Sheinbaum, J. Ochoa (eds.)

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"This publication comprises the papers provided at a colloquium held in reminiscence of professor Pedro Ripa at the first anniversary of this unexpected demise. … The booklet is written in an actual and extremely readable sort; there are various valuable reflections and figures all through. … might be steered not just to researchers yet ordinarily to all scientists and graduate scholars attracted to numerous elements of environmental sciences." (Andrzej Icha, natural and utilized Geophysics, Vol. one hundred sixty five, 2008)

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5-layer model predicts nonlinear stability as a consequence of Arnold’s first theorem for bT > 1 + r1−1 = 3 and any value of b (cf. also Figure 2, lower-right panel). Vertical dashed lines in each panel of Figure 4 indicate the values of b for marginal stability, denoted by b± . 5-layer model, b− = −ρ and b+ = ρr1 (1 − bT ). 66667, the b+ moves toward smaller values as bT increases, until it collapses with b− at bT = 3 (not shown in the figure). 5- and 3-layer models is nonlinearly stable. For b+ < b < b− the basic flow is unstable unless the zonal channel flow is narrow enough for Arnold’s second stability theorem to be fulfilled.

E. with mij = 0 for i = j, physical contravariant and covariant counterparts coincide, namely P · a ≡ P−1 · a . 2. GENERAL ASSUMPTIONS ON S Two main assumptions make the two-dimensional manifold S an idealized model of the surface of the (solid) Earth. First, S is assumed to be embedded in a three-dimensional Euclidean space which rotates steadily, with spinning frequency Ω, with respect to a Newtonian inertial space. Second, S is assumed to be a geopotential surface. Namely the projections onto Tx S of the centrifugal force (due to the spinning of the planet with respect to an inertial reference frame) and the gravitational attraction (due to the deviation of the shape of the planet from a perfect sphere and to inhomogeinities in the mass distribution within the planet) are assumed to balance one another exactly.

The latter, however, is an inconsistent first-order approximation, except at the equator. A consistent nth-order approximation is understood as one that produces O(R−n−1 ) errors in the integrals of motion associated with the equations on the sphere. These integrals are the (kinetic) energy of the particle as measured by a terrestrial observer, E := 12 u2 , (26) and the absolute angular momentum (with respect to the center of the planet and in the direction of the axis of rotation), which, up to some constants, is given by M := γu − ΩR (cos ϑ0 − γ cos ϑ) .

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