noun
- the boundary layer in the atmosphere between the mesosphere and the thermosphere, occurring at an altitude of about 50 miles (80 kilometers)
Usage: atmospheric science
Examples
- The mesopause marks the coldest point in Earth’s atmosphere.
- Temperatures at the mesopause can drop to minus 130 degrees Fahrenheit.
- Scientists study the mesopause to understand atmospheric dynamics.
- The mesopause occurs at approximately 80 kilometers above sea level.
- Noctilucent clouds form just below the mesopause.
- Atmospheric pressure at the mesopause is extremely low.