Intertropical Convergence Zone it is sometimes referred to as a monsoon trough, a usage more common in Australia and parts of Asia. In the seamen's speech, the zone is referred to as the doldrums because of its erratic (monotonous) weather patterns with stagnant calms and violent thunderstorms. The ITCZ appears as a band of clouds, usually thunderstorms, that encircle the globe near the Equator. In the Northern Hemisphere, the trade winds move in a southwestward direction from the northeast, while in the Southern Hemisphere, they move northwestward from the southeast. When the ITCZ is positioned north or south of the Equator, these directions
Asymmetry of the Intertropical Convergence Zone northern tropicalSST slightly. Vice versa, SST of southern part to the equator is much reduced. Therefore, SST of northern tropical is much higher, and higher than southern tropical, by which increases the CESG. As a result, this positive feedback, which is defined as Wind-Evaporation-SST (WES) will intensify this process. In this way, the WES keeps the ITCZ north of the equator. And the precondition of WES is the asymmetric distribution of SST, and WES also strengthens this process. According to the observation of equatorial upwelling and obvious asymmetry of the ITCZ in the Pacific and Atlantic, it is inferred that