In meteorology, the term "tropopause" refers to what?

The term "tropopause" specifically designates the boundary layer between the troposphere, where nearly all weather phenomena occur, and the stratosphere situated above it. This region is characterized by a transition in temperature and stability, where the temperature profile changes and typically becomes more stable.

Understanding this definition is crucial for meteorologists and aircraft dispatchers alike, as the tropopause plays a significant role in aviation. It marks the altitude at which weather phenomena typically cease and stable atmospheric conditions of the stratosphere begin, influencing flight planning and operations.

The other choices, while related to atmospheric layers and weather phenomena, do not accurately define the tropopause.