During which part of the day does the convective boundary layer typically occur?

The convective boundary layer typically occurs during the daytime due to solar heating of the Earth's surface. As the sun rises, the ground absorbs solar radiation, warming the surface and subsequently warming the air close to it. This process causes the air to rise, creating convective currents, which is characteristic of the convective boundary layer.

During the day, especially when conditions are clear, the mixing of air caused by convection can lead to a well-defined boundary layer that is turbulent. This layer is influenced by the thermal energy from the sun, which diminishes as the day progresses and the sun sets, thereby reducing convection and changing the nature of the boundary layer. Therefore, the correct answer is linked to the time of day when these convective processes are most vibrant, confirming that it is indeed during the daytime when the convective boundary layer is most prominent.