Geostrophic Flow

Question 1

When does Geostrophic force occur? ( part 1 )

Answer 1

When Coriolis force is in equilibrium with Pressure gradient force

Question 2

Where does Geostrophic force occur?

Answer 2

In the upper atmosphere and over the ocean

Question 3

Why doesn’t Geostrophic flow occur over land?

Answer 3

Because friction slows winds as the air uses energy to overcome the resistance of obstacles on land

Question 4

Summary of how Geostrophic force occurs

Answer 4

Pressure gradient force causes air to move from a high pressure to a low pressure. As the speed of the air increases, the Coriolis force deflects the wind either to its left or right depending on the hemisphere. Because the air is not slowed by friction , Coriolis force is strong and deflection increases until the Coriolis force and pressure gradient are in equilibrium. Air move parallel to isobars and not from high pressure to low pressure

Question 5

Which direction does air circulate around a cyclone or depressions ( low pressure ) in the Southern Hemisphere

Answer 5

Clockwise

Question 6

Which direction does air circulate around a high pressure (anticyclone) in the Southern Hemisphere

Answer 6

Anticlockwise

Question 7

Which direction does air move around a low pressure in the northern hemisphere?

Answer 7

Anticlockwise

Question 8

Which direction does air move around a high pressure cell in the northern hemisphere ?

Answer 8

Clockwise

Question 9

When does Geostrophic flow occur? ( part 2 )

Answer 9

When air moves parallel to the isobars at right angles to the pressure gradient