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A Lagrangian Decorrelation Time Scale in the Convective Boundary Layer

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Abstract

A new method for deriving the Lagrangian decorrelation time scales for inhomogeneous turbulence is described. The expression for the time scales here derived for the convective boundary layer is compared to those estimated by Hanna during the Phoenix experiment. Then the values of C0, the Lagrangian velocity structure function constant, and of Bi, the Lagrangian velocity spectrum constant, were evaluated from the Eulerian velocity spectra and from the Lagrangian time scales derived, under unstable conditions, from Taylor's statistical diffusion theory. The numerical coefficient of the lateral and vertical Lagrangian spectra in the inertial subrange was found equal to 0.21, in good agreement with previous experimental estimates.

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Authors
  1. Gervasio Degrazia
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  2. Domenico Anfossi
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  3. Haroldo Fraga De Campos Velho
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  4. Enrico Ferrero
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Degrazia, G., Anfossi, D., De Campos Velho, H.F. et al. A Lagrangian Decorrelation Time Scale in the Convective Boundary Layer. Boundary-Layer Meteorology 86, 525–534 (1998). https://doi.org/10.1023/A:1000734626931

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