Environmental Engineering Reference
In-Depth Information
Figure 2.13
Global wind and pressure patterns for January and July
by the season or by the year, and in some cases
over much shorter time scales as patterns of
energy flow change. There is a general southward
shift of the systems during the northern winter,
for example. The Intertropical Convergence Zone
(ITCZ)—the belt of low pressure produced by
the combination of equatorial heating and the
convergence of trade winds—migrates
southwards in sympathy with the southward
movement of the zone of maximum energy
receipt. Behind it, the sub-tropical anticyclones
also move south, contracting as they do so,
