Multiple choice

The world-wide jet stream that occurs in winter above the troposphere resulting from a very steep stratospheric gradient is the

  1. arctic jet stream

  2. sub-polar jet stream

  3. polar night jet stream

  4. sub-tropical jet stream

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The polar night jet stream occurs in winter above the tropopause in the stratosphere. It forms due to the extremely steep temperature gradient between the cold polar region (in polar darkness) and warmer mid-latitudes. This is distinct from the tropospheric jet streams and is specifically associated with winter stratospheric circulation.