Mid-latitude synoptic and mesoscale systems - Atmosphere, Weather and Climate - page 218

Figure 9.18 Mean pressure (mb) and surface winds for the world in January and July. The major frontal and convergence zones are
shown as follows: intertropical convergence zone (ITCZ), South Pacific convergence zone (SPCZ), monsoon trough (MT), Zaire air
boundary (ZAB), Mediterranean front (MF), northern and southern hemisphere polar fronts (PF), Arctic fronts (AF) and Antarctic fronts
(AAF).
Source : Partly from Liljequist (1970).