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Video Solution #2
Mac Lozer, AOSS 102, Professor Samson

2. Why is the polar jet
stream stronger in winter
than in summer?
Question:

3.  Polar Jet: A high-power stream of
wind that is on top of a polar front.
 Strongest location of a polar jet lies on
the top of the troposphere, known as
the tropopause
 Polar Jet Streams move generally in a
westward direction
 Wind shears cause the polar jet to
separate from warmer airs.
Polar Jet
Review

4.  The direction of, and rate of changes of
temperature in a particular location.
Surface Temperature Gradients

5.  In the Summer, the polar jet sits further north,
at approximately 60 Deg. North Latitude.
 Compared to winter time, the polar jet is not as
strong
Polar Jet Streams: Summer
Time

6.  Transitioning into a North American
Winter, the polar jets moves further
south and becomes stronger
 This is because the temperature
gradients are stronger (higher rate of
temperature change) in the south,
causing the polar jet to move south.
Transition into Winter

7.  The Polar Jet Stream moves southward
towards the higher temperature gradients
due to wind shears.
 This exhibits a stronger polar jet stream in
the south, which is much stronger of that in
the Summer time.
Polar Jet Stream: Winter
Time

8.  Surface Temperature Gradients (in winter),
stronger in the south, moving the stream
southward.
 North Pole: colder, Equator: temperature stays
the same
 More of a focus than the Subtropical Jet Stream
come winter time for meteorologists because
there is more change in the PJS than the STJS
Overall Causes: