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New PDF release: Advection and Diffusion in Random Media: Implications for

By Leonid I. Piterbarg, Alexander G. Ostrovskii (auth.)

ISBN-10: 1441947736

ISBN-13: 9781441947734

ISBN-10: 1475744587

ISBN-13: 9781475744583

This e-book originated from our curiosity in sea floor temperature variability. Our preliminary, although totally pragmatic, target was once to derive enough mathemat­ ical instruments for dealing with definite oceanographic difficulties. ultimately, besides the fact that, those issues went some distance past oceanographic purposes partially simply because one of many authors is a mathematician. We stumbled on that many theoretical problems with turbulent shipping difficulties were again and again mentioned in fields of hy­ drodynamics, plasma and strong subject physics, and arithmetic itself. There are few monographs all for turbulent diffusion within the ocean (Csanady 1973, Okubo 1980, Monin and Ozmidov 1988). whereas deciding on fabric for this ebook we concentrated, first, on theoretical concerns which may be worthwhile for knowing blend approaches within the ocean, and, sec­ ond, on our personal contribution to the matter. Mathematically the entire matters addressed during this e-book are focused round a unmarried linear equation: the stochastic advection-diffusion equation. there isn't any try to derive common information for turbulent circulate. as a substitute, the point of interest is on a statistical description of a passive scalar (tracer) below given pace statistics. As for functions, this e-book addresses just one phenomenon: shipping of sea floor temperature anomalies. expectantly, even though, our major techniques are acceptable to different subjects.

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Additional info for Advection and Diffusion in Random Media: Implications for Sea Surface Temperature Anomalies

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From an analytical viewpoint cases (A) ,(B) are not difficult. For model (A) we have Fickian equation for the mean concentration with effective diffusivity (Kubo 1963) J 00 D ~ 6"2 Ru(t)dt. 62) Scale Classification 41 In case (B) we have a similar result J 00 D '" c2 Ru(t, O)dt. 63) o In both cases the effective diffusivity is of the order c 2 and hence is much smaller than molecular diffusi vi ty (TD '" 1). For this reason we do not focus on these cases. The second reason is that (A) and (B) can be deduced from case (C) considered in detail below, by simply multiplying the velocity by c.

V 6c(t,r) A 6c(t,r) _ 6( _ 6S'(s,r) + 6S'(s,r) t s,r A _ ) r. These equations are equivalent to the following Cauchy problems respectively 6c(t, r) £'( A) 8 tUU i s,r ~ 6c(t, r) 6u~(s , , r) I +U t=s . '(s,r) + u. "V oc(t,r) o)"'(s,r) =0 ).. 21) r) The factors 1/2 on the right-hand sides are due to the agreement loco o(t)dt = ~. 15). - Bij ( r, r )ac(t,r) ax . j (c' (t, r ).. ) . "V(c) "V. ,s 1 = 1 2'''V. Bu>. 24) + "V. (r,r) and Bi,s(r,r) respectively. 48 CHAPTER 3 Now we show another derivation of this equation.

Ii) F ts depends only on increments w(t) - w(t'), a atE{Fts} :s; t. 60) (iii)! e. 57} is given by c(t,r) = E{Ftsf(r)}. 61) The proof is straightforward. 62) By using the independence of the Wiener process increments on non-overlapping intervals we obtain from (ii) a atE{FtsJ} Setting v =t a = atE{Ftv}E{FvsJ}. 60). 55). 49). Then set Ftsf(r) = f(Atsr). 64) Since Atsr is nothing more then the coordinate of the fluid particle at moment s passing through point r at moment t, one can conclude (see Fig.

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Advection and Diffusion in Random Media: Implications for Sea Surface Temperature Anomalies by Leonid I. Piterbarg, Alexander G. Ostrovskii (auth.)


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