Turbulent Transfer in Diabatic Conditions

Diffusion of particles having an equal fall velocity which are released from a crosswind line source in diabatic atmospheres is studied. The wind profile and eddy diffusivity assumed in this investigation are those proposed by Yamamoto and Shimanuki as a revision of the KEYPS formula. The solution of the resulting diffusion equation is obtained numerically for various combinations of the source height, thermal stability and terminal velocity of the particles. In addition the deposition rate of particles on the ground is estimated as a function of the downwind distance, source height and stability. Diffusion of particles having different sizes is then estimated. 1.

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“…As a revision of the KEYPS equation, Yamamoto and Shimanuki (1966) derived a relation between * and *0* as given by…”

Section: Equation Of Diffusion Of Particles and Its Solution I) Basicmentioning

confidence: 99%

“…In this paper the solution of Eq. (1) is obtained by numerical integration for the case in which the wind profile and eddy diffusivity are assumed to be those proposed by Yamamoto and Shimanuki (1966) as a revision of the KEYPS formula.…”

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confidence: 99%

Diffusion of Falling Particles in Diabatic Atmospheres

Yamamoto

Shimanuki

Nishinomiya

1970

Journal of the Meteorological Society of Japan

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“…Expressions for Fl(I&/) and F&))Defining F1(\& and F&I) as th e wind-profile functions under unstable and stable conditions, respectively,Shimanuki (1966) tabulated their values. Shimanuki (1969) developed interpolation formulae for F((& under both conditions, as follows A. Unstable IZI NM) = IyleO + o&38551/2]2 .f> 1.99 ~i(]& = 3.5005 tan-1[1.2442t1'3 +0.1792] -0.648 In [1.5 + O.432t-"3 + r-2'3] -3.44916 , B.…”

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Some characteristics of the PBL over the ocean during the Indian summer monsoon

Sinha

Khade

1980

Boundary-Layer Meteorol

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Data collected during the Indo-Soviet Monsoon-77 expedition are used to determine quadratic expressions for the universal constants A and B, as functions of the stability parameter, p. A quadratic expression has also been obtained for u*, in terms of the surface wind u,. It is shown, from the mean values of q and en, that the entire area covered by the expedition could be divided into four regions around the point 13"N, 78" E. The mean thermal characteristic of each region differs. It is shown that the northeastern quadrant is most favourable for the sustenance of a tropical storm once it has formed.

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Parameterized processes in the surface boundary layer of an atmospheric circulation model

Delsol

Miyakoda

Clarke

1971

Quart J Royal Meteoro Soc

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A general circulation model is modified successively by adding five new features in the lower boundary layer; namely, (i) a different roughness parameter over land and sea, (ii) a Monin-Obukhov type treatment of the turbulent transfer process in the constant-flux layer, (iii) a Richardson number dependent parameterization for E h a n layer process, (iv) a diurnal variation of insolation, and (v) heat conduction into the soil. To assess the effect of each, the experiments are repeated by gradually increasing the complexity of the model. The circulation model has relatively low horizontal grid resolution and 9 vertical levels, and it is applied to a winter case for 14 day predictions. The results indicate that the sophistication of the boundary layer physics does not produce a particularly large effect on the synoptic scale prediction until about 7 days. Its effect may become large after 10 days. One noteworthy result is that the effect of the diurnal variation of insolation is not great for the free atmosphere but an influence is effectively transferred in the vertical, if the Richardson number dependent parameterization for the Ekman layer process is incorporated. The entire study is a preliminary test, the purpose of which is to determine the relative magnitude of each effect. A detailed comparison with observed data was not attempted.

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Turbulent Transfer in Diabatic Conditions

Abstract: The turbulent exchange coefficient

Cited by 22 publications

References 5 publications

Diffusion of Falling Particles in Diabatic Atmospheres

Diffusion of Falling Particles in Diabatic Atmospheres

Some characteristics of the PBL over the ocean during the Indian summer monsoon

Parameterized processes in the surface boundary layer of an atmospheric circulation model

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