Geoscience Reference
In-Depth Information
Model Derived log(z
0
)
0
-
2
-
4
-
6
320
340
360
380
400
420
440
460
480
500
520
Year Day where 1 Jan 1997 = 1
Fig. 9.11
Time series of the natural logarithm of underice surface roughness derived from SLTC
model runs based on measured Reynolds stress and relative velocity at TIC 2 on the SHEBA
turbulence mast, nominally8m below the ice/ocean interface (see also Colorplate on p. 212)
Dimensionless Surface Velocity
25
a
20
15
13.4
10
5
320
340
360
380
400
420
440
460
480
500
520
Day of 1997
50
b
40
30
25.9
20
10
320
340
360
380
400
420
440
460
480
500
520
Day of 1997
Fig. 9.12 a
Magnitudeofdimensionless surface velocity(withrespect toundisturbed flow)forthe
model solutions.
b
Magnitude of the angle between
V
0
and
u
∗
0
do not decrease
with increasing
V
0
as would be expected if the boundary layer strictly followed
Rossby similarity scaling. Indeed, the trend is opposite, with
In contrast to the AIDJEX analysis, the magnitudes of
Γ
and
β
increasing in both
magnitude and deflection angle. The most plausible explanation is that during al-
most all of SHEBA the well mixed layer was significantly shallower then during
Γ
