Download e-book for iPad: A Mathematical Theory of Large-scale Atmosphere/ocean Flow by Michael J P Cullen

By Michael J P Cullen

ISBN-10: 186094518X

ISBN-13: 9781860945182

This publication counteracts the present style for theories of "chaos" and unpredictability by way of describing a conception that underpins the mind-blowing accuracy of present deterministic climate forecasts, and it means that additional advancements are attainable. The e-book does this through creating a distinctive hyperlink among a thrilling new department of arithmetic known as "optimal transportation" and current classical theories of the large-scale surroundings and ocean circulate. it really is then attainable to resolve a suite of straightforward equations proposed decades in the past via Hoskins that are asymptotically legitimate on huge scales, and use them to derive quantitative predictions approximately many large-scale atmospheric and oceanic phenomena. a specific function is that the easy equations used have hugely predictable options, hence suggesting that the boundaries of deterministic predictability of the elements would possibly not but were reached. it's also attainable to make rigorous statements in regards to the large-scale behaviour of the ambience and ocean by means of proving effects utilizing those basic equations and utilising them to the genuine method taking into account the blunders within the approximation. there are many different titles during this box yet they don't deal with this large-scale regime.

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In the absence of dissipation and source terms, and with the boundary conditions u - n = 0 on the boundary of T, the semi-geostrophic equations can be shown to conserve the energy integral E = 3 -Z'G< P (ziUg + v2g) + CVT + gr ) a'cos^dAd(£dr. 6). We will see later that such a conservation law does hold for the deep atmosphere version of the equations. Much of this book is taken up with analysing the semi-geostrophic equations. However, some key points are noted at the outset: (i) The only approximations made are to the horizontal momentum.

If LA and A are of similar magnitude, and the natural frequencies of the waves are large compared with those contained in A, then the response to the 'forcing' terms A can be expressed as the 'slow' equation LA = A. 16) It is therefore important to identify circumstances under which L is large. 14). 10) assume that A ~ w/H. 14) has magnitude (U/L)2A/H, the second term has magnitude f2A/H and the third term has magnitude N2L~2HA. 16) are valid if either the Rossby number Ro = U/(fL) or the Froude number Fr = U/(NH) is small.

The trajectories were computed from 3-hourly data. Bottom: the vertical position of the trajectories (m). Source: Atmospheric Dispersion Group, Met Office. ©Crown copyright 2005 Published by the Met Office. 1 Various approximations t o the shallow water equations The shallow water equations In this section we place the semi-geostrophic approximation in context by comparing it to other commonly used approximate systems of equations. We do this by applying the approximations to a simpler system of basic equations which is more amenable to analysis, the equations for long waves on shallow water in a rotating frame of reference.

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A Mathematical Theory of Large-scale Atmosphere/ocean Flow by Michael J P Cullen

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