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4.b.iii. Atmospheric heating profile
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Figure 12d shows the horizontal and time
mean vertical profiles of atmospheric heating rate for
potential temperature of the 6th day in the dusty case.
The major component of radiative heating above 2 km height during
daytime is dust absorption of solar radiation.
The magnitude of convective heating and the depth of
convectively cooling layer near the surface
are almost the same as those of the dust-free case.
During the nighttime,
the entire region of the calculated domain
is subject to infrared radiative
cooling due to CO2 and dust.
Each component of the heating profile shown in
Figure 12d
is presented in Figure 12e.
The profile of near infrared radiative heating due to
CO2 is vertically uniform
over the calculated domain.
In the convective layer, where dust mixing ratio is uniform,
the profile of radiative heating due to dust is
vertically uniform.
These two components tend to suppress thermal convection,
since they warm the convection layer uniformly
in the vertical direction.
The radiative component which contributes dominantly to
driving thermal convection is
the infrared heating due to CO2
which has a vertical profile
concentrated near the surface.
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Figure 12d:
Diurnal change of the horizontal and time mean vertical profiles of
atmospheric heating rate (K/day) for potential temperature
in the 6th day of the dusty case.
Orange line denotes convective heating,
red line denotes infrared radiative heating,
blue line denotes solar radiative heating,
green line denotes turbulent diffusion of potential temperature,
and light purple line denotes heating due to turbulent
dissipation, respectively.
Lower panel shows the magnified profiles of
the lower altitudes below 1 km height of upper panel.
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Figure 12e:
Diurnal change of the horizontal and time mean vertical profiles of
radiative heating rate (K/day)
in the 6th day of the dusty case.
Red line and purple line denote infrared radiative heating
due to CO2 and that of dust,
blue line and light blue line denote solar radiative heating
due to CO2 and that of dust.
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