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Original Research Papers

Scalar arguments of the mathematical functions defining molecular and turbulent transport of heat and mass in compressible fluids

Authors:

Andrew S. Kowalski ,

Departamento de Física Aplicada, Facultad de Ciencias, Universidad de Granada; Centro Andaluz de Medio Ambiente (CEAMA), ES
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Daniel Argüeso

Departamento de Física Aplicada, Facultad de Ciencias, Universidad de Granada, ES
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Abstract

The advection–diffusion equations defining control volume conservation laws in micrometeorological research are analysed to resolve discrepancies in their appropriate scalar variables for heat and mass transport. A scalar variable that is conserved during vertical motions enables the interpretation of turbulent mixing as ‘diffusion’. Gas-phase heat advection is shown to depend on gradients in the potential temperature (θ), not the temperature (T). Since conduction and radiation depend on T, advection–diffusion of heat depends on gradients of both θ and T. Conservation of θ (the first Law of Thermodynamics) requires including a pressure covariance term in the definition of the turbulent heat flux. Mass advection and diffusion are universally agreed to depend directly on gradients in the gas ‘concentration’ (c), a nonetheless ambiguous term. Depending upon author, c may be defined either as a dimensionless proportion or as a dimensional density, with non-trivial differences for the gas phase. Analyses of atmospheric law, scalar conservation and similarity theory demonstrate that mass advection–diffusion in gases depends on gradients, not in density but rather in a conserved proportion. Flux-tower researchers are encouraged to respect the meteorological tradition of writing conservation equations in terms of scalar variables that are conserved through simple air motions

How to Cite: Kowalski, A.S. and Argüeso, D., 2011. Scalar arguments of the mathematical functions defining molecular and turbulent transport of heat and mass in compressible fluids. Tellus B: Chemical and Physical Meteorology, 63(5), pp.1059–1066. DOI: http://doi.org/10.1111/j.1600-0889.2011.00579.x
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  Published on 01 Jan 2011
 Accepted on 21 Jul 2011            Submitted on 4 Dec 2010

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