F. Beyrich et V. Kotroni, ESTIMATION OF SURFACE STRESS OVER A FOREST FROM SODAR MEASUREMENTS AND ITS USE TO PARAMETERIZE THE STABLE BOUNDARY-LAYER HEIGHT, Boundary - layer meteorology, 66(1-2), 1993, pp. 93-103
Sodar observations from three nights of the HAPEX-MOBILHY experiment h
ave been used to compute covariances between single measurements of th
e three velocity components. From these, estimates of a low frequency
friction velocity u are derived which show better correlation with ob
served values of the stable boundary layer (SBL) height, h, than direc
t u-measurements by an ultrasonic anemometer. On the contrary, interd
iurnal variability of h is better correlated with direct u-measuremen
ts. These findings should be mainly due to the problem of different sp
ectral and spatial representativity of the two u-values.