A result og the heating of part fo the Earth's surface, caused by the concentrated insolation from the overhead sun, which heats air near the surface. THe heated air becomes less dense and rises. This draws in cooler air that flows across the surface to replace the rising air. Air streams are drawn in from both north and south of the equator and meet where air is rising.
A major influence on all tropical climates is the position of the ITCZ and the role of associated subtropical anticyclones. The ITCZ occurs along a line where the NE trade winds, blowing away from the hadley cell in the northern hemisphere, meets the SE trade winds from the southern hemisphere.
Combined with intense heating in the low latitudes, this causes air to rise and this in turn in helped by divergence aloft. The tendency of air to be lifted by convergence is greater on the western sides of the oceans. This increases the frequency of storms in these parts of the tropics.
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