TY - JOUR
T1 - A Lagrangian decorrelation time scale in the convective boundary layer
AU - Degrazia, Gervasio
AU - Anfossi, Domenico
AU - De Campos Velho, Haroldo Fraga
AU - Ferrero, Enrico
N1 - Funding Information:
One of the authors, H. F. de Campos Velho, acknowledges the financial support given by FAPESP (Proc. 97/06671-0) to the scientific visit to the Istituto di Cos-mogeofisical of Turin.
PY - 1998
Y1 - 1998
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=0031716940&partnerID=8YFLogxK
U2 - 10.1023/A:1000734626931
DO - 10.1023/A:1000734626931
M3 - Article
SN - 0006-8314
VL - 86
SP - 525
EP - 534
JO - Boundary-Layer Meteorology
JF - Boundary-Layer Meteorology
IS - 3
ER -