Geoscience Reference
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Fig. 3.1 Schematic of the
Earth's general circulation: the
trade winds and the mean
meridional circulation.
Downwelling at around 30
latitude leads to consistent high
pressures and dry air, hence our
deserts (see Chap. 11 ). On
another world of different size
and/or rotation rate, the latitudi-
nal extent of the cells would be
different (as is the case on Titan).
NASA image
Fig. 3.2 Mean surface winds on
Titan predicted by a Global
Circulation Model (an arrow
length of one grid spacing equals
1 m/s) in southern summer.
Rising air in the summer
hemisphere draws in a surface
flow from the north. GCM winds
for Mars are shown in Fig. 19.1 .
Image courtesy Tetsuya Tokano
 
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