An upper-air front involves downward motion of the
A)tropopause.
B)stratopause.
C)low-level jet.
D)both tropopause and low-level jet
E)both stratopause and low-level jet.

Question

An upper-air front involves downward motion of the
A)tropopause.
B)stratopause.
C)​low-level jet.
D)​both tropopause and low-level jet
E)​both stratopause and low-level jet.

Quizplus · Accepted Answer

An upper-air front involves the downward motion of the tropopause. This is because an upper-air front is where cold air from higher levels of the atmosphere pushes warmer air at lower levels upwards. In this process, the boundary between the cold and warm air masses is marked by a sharp gradient in temperature and humidity which is located near the tropopause. As a result, the tropopause is pushed downward.

An Upper-Air Front Involves Downward Motion of the