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Figure 5: Time development of
the magnitude of surface stress from LT=6:00 to 18:00 every 10 minutes.
The blue and light blue lines show instantaneous maximum and
horizontal mean value respectively.
The orange and red lines show the minimum and maximum value of
threshold surface stress required to raise dust from the surface
(Greeley and Iversen, 1985).
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Figure 5 shows diurnal change of
the magunitude of surface stress calculated from the lowest level
horizontal wind velocity by using the bulk formula (Louis, 1979).
The maximum value of horizontal mean surface stress is around 0.005
Pa.
However, the instantaneous maximum value of surface stress at each
grid point reaches 0.03 to 0.04 Pa, which are the minimum and
maximum value of threshold surface stress required to raise dust
from the surface (Greeley and Iversen,
1985).
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