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Figure 5: Diurnal change of the magnitude of surface
stress from LT=06:00 to 18:00.
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 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 the hight 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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