Meridional Energy Transport in Experiment S1570
In experiment S1570, latent heat transport remarkably increases
(Figure 1). The distribution of dry static energy transport shows
that the component of mean meridional circulation is dominant near
45 latitude north and south. The reason is considered to be that the
contribution of transient disturbances decreases since meridional
temperature difference in mid- and high-latitude region decreases
(Figure is not shown). Further study on structure of disturbances is
necessary to answer this problem.
The distribution of latent heat energy transport shows that total
amount of transport relatively decreases in equatorial region. The
equatorward transport by mean meridional circulation is canceled out
by poleward transport by transient disturbances. As a result, the
evaporation is balanced with precipitation in equatorial region and
it seems that the equatorial region is a closed system. As is the
case in experiment S1380, the transient disturbance component is
dominant near 40 latitude north and south where the latent heat
transport is maximum: the transient disturbances near 40 latitude
north and south are vortex disturbances emerging in equatorial
region and migrating to mid-latitude region which are accompanied
with precipitation (See Characteristics of
Atmospheric Disturbance in Equilibrium State).
(a)  |
(b) 
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Figure 1: Meridional energy transport in
experiment S1570 (W). (a): Meridional dry static energy
transport. (b): Meridional latent heat energy transport. Red: total
transport. Blue: transport by the mean meridional
circulation. Green: transport by stationary disturbances. Light
brown: transport by transient disturbances. |
