A New Eddy Diffusivity Parameterisation For Dispersion Models:
Evaluation In Different Atmospheric Conditions
Author(s)
C. Mangia, I. Schipa, D.M. Moreira, T. Tirabassi, G.A. Degrazia
& U. Rizzam
Abstract
A new eddy diffusivity parameterisation for
dispersion models: evaluation in different
atmospheric conditions
C. Mangia*, I. Schipa*, D.M. Moreira^, T. Tirabassi^,
G.A. Degrazia* & U. Rizza*
* ISlAtA/CNR, Lecce, Italy
* Universidade Luterana do Brasil, Canoas (RS), Brazil
^ /^AO/CAW, go/ogna, /Wy
Universidade Federal de Santa Maria, Santa Maria, Brazil
Abstract
Accounting for the current knowledge of the atmospheric boundary layer a
parameterisation for eddy diffusivity has been derived by using a model for the
frequency spectrum of eddy energy. The new formulation, based on Taylor
classical diffusion theory and further developments by Pasquill, adequately
represents the turbulent mechanisms in the various regimes of the Planetary
Boundary Layer (PEL) giving continuous values at all elevations and all stability
conditions from unstable to stable. The formulations, included in an advanced
analytical model, has been evaluated using data from field experiments in
different
Keywords
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