1. Solar Radiation: The sun emits electromagnetic radiation, including visible light, infrared, and ultraviolet radiation.
2. Earth's Surface: The Earth's surface (land, water, and vegetation) absorbs a significant portion of this incoming solar radiation.
3. Heat Transfer: The absorbed solar radiation increases the temperature of the Earth's surface. This heat is then transferred to the air directly above it through conduction (heat transfer through direct contact) and convection (heat transfer through movement of fluids, like air).
This process of heating the lower troposphere is often referred to as surface heating.
Important Note: While solar radiation is the primary source of heat for the first few meters of the troposphere, other factors can also contribute to heating, such as:
* Evaporation and Condensation: Evaporation of water from the surface takes heat energy, while condensation releases heat, both affecting air temperatures.
* Human Activities: Human activities, such as burning fossil fuels, can release heat and contribute to warming of the troposphere.
