Geoscience Reference
In-Depth Information
35.5
(a)
35.0
34.5
34.0
33.5
33.0
32.5
32.0
31.5
-3.0
-2.0
-1.0
0.0
1.0
2.0
3.0
w'
(m s
-1
)
35.5
(b)
35.0
34.5
34.0
33.5
33.0
32.5
32.0
31.5
14.0
14.5
15.0
15.5
16.0
16.5
17.0
q'
(g kg
-1
)
Figure 3.7
Correlation plots of turbulent luctuations. (
a
) Vertical wind speed and
temperature. (
b
) temperature and speciic humidity. The data in this igure are the
same data as used in
Figure 3.4
.
correlation coeficient is typical for very convective (unstable) conditions. For neutral
conditions
R
wθ
is much lower, of the order of 0.25 (Moene and Schüttemeyer,
2008
;
see
Section 3.3.5
for the deinition of unstable and neutral conditions).
Figure 3.7a
shows a scatterplot of all samples of vertical wind speed and
temperature. Indeed, there is a positive correlation (higher temperatures go together
with higher (positive) vertical wind speed). But it is not a nice one-to-one linear
correlation.
The second covariance dealt with here is the covariance between temperature and
humidity. Because both heat and humidity are transported by the same mechanism
(turbulence), and high temperatures and humidity values are found close to the sur-
face during daytime (and lower values higher up), one would expect temperature and
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