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3.a. Horizontal mean fields
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Figure 3a shows the time development
of the vertical profile of horizontal mean temperature (left panel)
and potential temperature (right panel) from LT = 8:00 every 4 hours.
The convection layer where the potential temperature is vertically
uniform appears in daytime.
The maximum depth of convection layer is about 10 km at LT = 16:00.
There appears a thermal boundary layer near the surface where the
potential temperature gradient steepens rapidly toward the ground
surface.
At night, the inversion layer appears below 2 km hight.
It is developed by infrared radiative cooling near the surface.
The region above 10 km hight is stratosphere where the vertical
gradient of horizontal mean potential temperature is positive.
The vertical profile of horizontal mean temperature in stratosphere
shows diurnal change whose amplitude is about 2 K.
It is caused by near infrared radiative heating in daytime and
infrared radiative cooling at night.
The depth of convection layer in daytime is about 1 km thicker that
that obtained by using 1D model of Pollack et al.(1979) under
same seasonal and latitudinal conditions.
This difference is caused by that the penetration of convective plume to
stratosphere can be represented explicitly in 2D model.
The vertical profile of horizontal mean temperature at night is
similer to that of Pollack et
al.(1979).
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Figure 3a:
Time development of the vertical profile of horizontal mean
temperature (left panel) and potential temperature (right panel)
from LT = 8:00 every 4 hours in dust-free case.
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Other results of horizontal mean field
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