Large global wind systems are created by the uneven heating of the Earth's surface. These global wind systems, in turn, drive the oceans' surface currents. ... Warm air rises at the equator and moves toward the poles. At the poles, the cooler air sinks and moves back toward the equator. However, it is not this simple.
It is a circulation of large scale movements of air mass over the earth by the means of solar energy. Wind belts are also connected to this pattern of air flow between high and low pressure belts like the Hadley, polar, and ferrel cells both in northern and southern hemisphere. the ITCZ area i.e the equator drives most of these winds and as result the warm air rises and colder air which is heavy descent thus leading to the formation of clouds which in turn is also impacted by the sun rays and spinning of the planet differently in northern and southern hemisphere. For example, as the warm current like japanese black or Kuroshio raise temperature in polar area's thus affecting the temperature extremes of the that area indirectly impacting the precipitation around the globe.
