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Figure 5: Diurnal change of the magnitude of surface stress
from 06:00 to 18:00 LT. Blue and light blue lines indicate the maximum
value and horizontal mean value, respectively. Orange and red lines
indicate the minimum and the maximum values, respectively, of the
threshold surface stress required to raise dust from the surface
(Greeley and Iversen, 1985).
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Figure 5 shows the diurnal change of
the magnitude of surface stress calculated from the horizontal wind
velocity at a height of 1.5 m, which is the lowest level of the
model. The maximum value of the horizontal mean surface stress is
around 0.005 Pa. However, the maximum value of surface stress at each
grid point reaches 0.03 to 0.04 Pa. According to
Greeley and Iversen, 1985, these
values are of the order of the threshold surface stress, which is
required to raise dust from the surface.
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