"Scalinga"

Taylor, Isaac

doi:10.1093/nq/s9-i.11.215b

Cited by 2 publications

(4 citation statements)

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“…This compares with Taylor's (1915) estimate of 3 x 103 over the sea (Great Banks) in a similar wind, but with a marked inversion replacing the isothermal condition at Cardington. Thus in situations of advective cooling the flux of heat is directed downwards, K ' being positive and of considerable magnitude.…”

Section: Combination Of Mechanical and Buoyancy Fluxsupporting

confidence: 67%

“…The vertical transport of heat by eddies in the atmosphere has been discussed by Taylor (1915) in a treatm ent later modified by B runt (1929,1939). They con sidered the transfer of heat by eddies across a horizontal surface in the atmosphere a t height z (strictly an isobaric surface should be considered, but the approximatio is amply justifiable).…”

Section: H B Priestley and W C Swinbank 2 T H E C L A S S I mentioning

confidence: 99%

“…Taylor (1915) describes an eddy as breaking away from the surrounding air, thereby implying th at at the time when it can be considered a normal sample of its surroundings it is also (vertically) at rest relative to them. This assumption was later discarded when the possibility of different quantities having different diffusion coefficients was discussed in greater detail.…”

Section: S O M E a S P E C T S O F T H E C L A S S I C A L T H E O R Ymentioning

confidence: 99%

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Vertical transport of heat by turbulence in the atmosphere

Priestley¹,

Swinbank²

1947

Proc. R. Soc. Lond. A

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A necessary consequence o f the classical theory o f the turbulent transfer of heat in the atmosphere is that the flux o f heat is in the direction from high to low potential temperature, and this normally involves the flux being from low to high actual temperature. On exam ina tion this is shown to be consistent w ith the second law of thermodynamics.However, the theory assumes that an eddy m ay be regarded as a normal sample o f the population at its level of origin; but when account is taken of buoyancy effects in a necessarily heterogeneous atmosphere it is clear that this assumption is incorrect. It also becomes apparent in the discussion that a definition of the concept ' level of origin ' of an eddy more rigid than that given in the classical theory is necessary, and this has been given. I t is shown that a component of heat flux, here called 'convective turbulence', m ust result from the buoyancy forces. This is always directed upwards and is thus opposed to the general downward transfer of mechanical turbulence.Records of the fluctuations in temperature at fixed levels show amplitudes which cannot be explained by mechanical turbulence. The traces further indicate that convective turbulence m ay at tim es com pletely dominate the direction o f the flow o f heat, a conclusion which is supported by reference to some synoptic examples. This result helps to explain the normal increase of potential temperature with height.Dimensional considerations provide a rough measure of the dependence of the buoyancy flux on the lapse rate and amplitude of fluctuations, and also allow the total flux to be written in the classical form pcv K K \ which m ay be positive or negative, will depend upon the synoptic situation. Some of the implications in synpotic and general theoretical meteorology are discussed in detail. The turbulent transfer o f physical quantities other than heat is briefly considered.

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Section: Combination Of Mechanical and Buoyancy Fluxsupporting

confidence: 67%

Section: H B Priestley and W C Swinbank 2 T H E C L A S S I mentioning

confidence: 99%

Section: S O M E a S P E C T S O F T H E C L A S S I C A L T H E O R Ymentioning

confidence: 99%

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Vertical transport of heat by turbulence in the atmosphere

Priestley¹,

Swinbank²

1947

Proc. R. Soc. Lond. A

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“…Two different approaches of the MLT have been proposed, which lead to the same equations at equilibrium but differ when we consider their perturbations. On one hand, the theory of Gough (1965Gough ( , 1977 is based on Taylor's (1915) and Prandtl's (1925) original analogy between turbulence and the kinetic theory of gases. In this description, the convective elements are accelerated by the buoyancy force over a characteristic length (the Mixing-Length (ML)) and then exchange their thermal energy with the average medium.…”

Section: Introductionmentioning

confidence: 99%

Convection-pulsation coupling

Grigahcène

Dupret

Gabriel

et al. 2005

A&A

187

246

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Abstract. We present in details a time-dependent convection treatment in the frame of the Mixing-Length Theory (MLT). Following the original ideas by Unno (1967, PASJ, 19, 140), this theory has been developed by Gabriel et al. (1974, Bull. Ac. Roy. Belgique, Classe des Sciences, 60, 866) and Gabriel (1996, Bull. Astron. Soc. India, 24, 233). In this paper, we present it in a united form, we detail the basic derivations and approximations and give final improvements. A new perturbation of the energy closure equation is proposed for the first time, making it possible to avoid the occurrence of short wavelength spatial oscillations of the thermal eigenfunctions. This theory accounts for the perturbation of the convective flux, the turbulent Reynolds stress and the turbulent kinetic energy dissipation. It has been numerically implemented in a non-radial non-adiabatic pulsation code and the first results published in a Letter by Dupret et al. (2004a, A&A, 414, L17) indicate that the theory predicts the observed red border of the lower end of the instability strip and the driving mechanism of the recently discovered γ Dor stars.

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"Scalinga"

Cited by 2 publications

References 0 publications

Vertical transport of heat by turbulence in the atmosphere

Vertical transport of heat by turbulence in the atmosphere

Convection-pulsation coupling

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