The phenomenon of‘trade winds’ takes place due to

The phenomenon of trade winds is a direct result of the Hadley cell, which is a thermal convection cell [3]. Solar radiation causes intense heating at the equator, leading to the rising of warm, less dense air. This vertical movement of air due to heating is the process of convection [4]. As this air rises, it creates a low-pressure zone at the surface, drawing in cooler air from the subtropical high-pressure belts (around 30° N and S) [2]. These surface winds, moving toward the equator and deflected by the Coriolis force, are known as trade winds [1]. While radiation provides the initial energy and conduction occurs at the very thin surface-air interface, the large-scale atmospheric circulation and the resulting wind belts are primarily driven by convection [3].

Sources

1. [2] Physical Geography by PMF IAS, Manjunath Thamminidi, PMF IAS (1st ed.) > Chapter 23: Pressure Systems and Wind System > Hadley Cell > p. 317
2. [3] Physical Geography by PMF IAS, Manjunath Thamminidi, PMF IAS (1st ed.) > Chapter 27: Jet streams > Geostrophic Wind > p. 385
3. [4] https://www.weather.gov/source/zhu/ZHU_Training_Page/winds/Wx_Terms/Flight_Environment.htm
4. [1] Physical Geography by PMF IAS, Manjunath Thamminidi, PMF IAS (1st ed.) > Chapter 23: Pressure Systems and Wind System > The Trade Winds > p. 319