turbopause

The turbopause is a transition zone in Earth's atmosphere, located around 100 km (60 miles) above the surface, separating the homosphere from the heterosphere. In the homosphere, below the turbopause, turbulent mixing is dominant, leading to a relatively uniform composition of gases. Above the turbopause, in the heterosphere, gases are separated by molecular mass, with lighter gases like helium and hydrogen concentrated at higher altitudes.12

The atmosphere is layered based on temperature changes:
* Troposphere: The lowest layer, where temperature generally decreases with height and most weather occurs.1
* Stratosphere: Above the troposphere, where temperature increases with height due to ozone absorbing ultraviolet radiation.2
* Mesosphere: Located between about 50 and 80 km, where temperatures decrease with altitude.3
* Thermosphere: Above the mesosphere, where temperature increases with height again.4