A Lagrangian decorrelation time scale in the convective boundary layer

Gervasio Degrazia, Domenico Anfossi, Haroldo Fraga De Campos Velho, Enrico Ferrero

Research output: Contribution to journalArticlepeer-review

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.

Original languageEnglish
Pages (from-to)525-534
Number of pages10
JournalBoundary-Layer Meteorology
Volume86
Issue number3
DOIs
Publication statusPublished - 1998
Externally publishedYes

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