Time Evolution of the Precipitation Distribution in Experiment S1570
In Experiment S1570, vortex disturbances originating in the
equatorial region and migrating to the mid-latitudes are the most
active around 40° latitude north and south. For example, the
disturbance that is present near 15° latitude, 220°
longitude on Day 1008 migrates to 25° latitude, 260° longitude on
Day 1012 and then to 40° latitude, 315° longitude on Day
1016. After this day, the disturbance migrates to higher latitudes
and then eastward nearly along 60° latitude north and disappears on
Day 1026. Most precipitation near 40° latitude north and south is
caused by this type of disturbance. Although not shown in the form
of a figure, a vortex structure characterizes these disturbances and
typhoons on the actual Earth would be the closest equivalent of
these disturbances. An examination of high latitude regions poleward
of latitude 60° shows a broad precipitation band as wide as 100
longitudinal degrees. This precipitation band moves eastward and
persists for 10 to 20 days. Although the precipitation band
presumably forms as a result of baroclinic instabilities, it cannot
be concluded with certainty since no analysis has yet been conducted
on the circulation structure.
Animation 1: Time evolution of the precipitation
distribution (W/m2) in Experiment S1570. The animation illustrates
the time evolution for a 16-day period in conditions that are
considered to be nearly in equilibrium.
