Surface Fluxes of Momentum, Heat, and Water Vapor
" " "
o
a:>
a:>
"
0
101
100
10-1 -
10-1
3 -
100
10-1
3 .
10-2
10-1
r 1
100
r (m)
3 4 5
100
3 4 5
r (m)
75
101
101
3 4 5
Figure 3_6: (a) Sample third order structure function of longitudinal velocity (top). (b) Sample
mixed third order struct'ure function of velocity and temperature fluctuations (bottom).
3.3.3 Normalized dissipation rates of temperature
From the temperature spectra, log transformation of (3.25) allows the straightforward determination of EO from the regressed intercept of log (Eo) vs log( k), with E known from the above
analysis. A similar approach to the second order structure function provides an estimate of
Eo. Due to the uncertainty associated with the constants in the spectral and the second order
structure function methods (Kiely et aI., 1996), we determine the constants for (3.16) using
only the third order structure function (3.29) based results. A comparison of the three inertial
subrange methods was made by Kiely et al. (1996). The three sublayer model for .e (3.16) was