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4.b. Diurnal Change of Horizontal Mean Field
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Figure 12a shows the diurnal variation of the
vertical profiles of horizontal mean temperature and potential
temperature for day 6, when the amount of atmospheric dust reaches an
almost equilibrium state. The profiles of horizontal mean temperature
and potential temperature show fairly regular diurnal change, while
that of atmospheric dust shows little change
(Figure 11b). The depth of the
convection layer during daytime is about 5 km, which is roughly half
that for the dust-free case (Figure
3e). One reason for this decrease in convection layer depth is an
increase in stratospheric temperature, which is due to radiative
heating caused by dust absorption of solar radiation
(Figure 12e).
|
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Figure 12a: Vertical profiles of horizontal mean temperature
(left panel) and potential temperature (right panel) for the dusty
case. Profiles are every 4 hours beginning at 8:00 LT on day 6.
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The other results of diurnal changes in mean fields on day 6.
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