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4.a.i. Horizontal mean dust mixing ratio
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Figure 11a shows the vertical profile
of horizontal mean dust mixing ratio of the first and
the second days.
As a result of dust injection and mixing of the first day,
a region with a large vertical gradient of dust mixing ratio
forms at the altitudes of from 11 km to 13 km.
On the second day,
dust, which has reached the bottom of the stratosphere,
is transported slowly into the higher altitudes.
The vertical profile of horizontal mean dust mixing ratio
does not change greatly after the 4th day
(Figure 11b).
Horizontal mean dust mixing ratio in the convection layer
is vertically uniform and slightly increasing as the depth
of convection layer decreases.
This indicates that
the system is in a quasi equilibrium state
where the total amount of dust in the atmosphere
does not change significantly
(Figure 9);
the amount of dust injection is roughly in balance
with the amount of dust sedimentation.
In the region above the convection layer,
dust mixing ratio slightly decreases
as dust sedimentation progresses slowly.
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Figure 11a: Vertical profiles of horizontal
mean dust mixing ratio
plotted every 1 hour from LT = 13:00 to 18:00 on the
first day (left panel),
and
plotted every 2 hours from LT = 8:00 to 18:00 on the second day
(right panel).
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Figure 11b: Vertical profile of horizontal
mean dust mixing ratio at LT = 16:00
from the first day to the 6th day.
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