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Circulation in the atmosphere

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Presentation on theme: "Circulation in the atmosphere"— Presentation transcript:

1 Circulation in the atmosphere

2 What regulates the motion of fluid particles in the ocean and atmosphere?
Newton’s Law

3 Differential Heating From Equators to Poles

4 What drives the circulation of the atmosphere?
Heating by the sun  AIR PRESSURE Equator/Tropics Higher Latitudes surface troposphere

5

6 Vertical view of air pressure (global convection)
High Pressure Low Pressure Low Pressure

7 + _ Horizontal view of air pressure at ocean surface High Pressure
Higher Latitudes Surfaces of constant pressure y (latitude) x (longitude) _ Equator/Tropics Low Pressure

8

9 Newton’s Law Motion across Latitudes Motion along Latitude v
y (latitude) x (longitude) u Motion across Latitudes Motion along Latitude

10 Non rotating view of Atmospheric Circulation

11 Hurricane IVAN H H L H H

12 North Hemisphere Fpressure FCoriolis Low Pressure High Pressure
Rate of Rotation North Hemisphere Low Pressure B t1 t2 t3 t4 t5 A Fpressure High Pressure FCoriolis

13 North Hemisphere Fpressure FCoriolis High Pressure Low Pressure
Rate of Rotation North Hemisphere A B High Pressure Low Pressure t1 t2 t3 t4 t5 Fpressure FCoriolis

14 Fpressure FCoriolis Fpressure FCoriolis Fpressure Fpressure FCoriolis
When this balance is reached the movement of the particles (and therefore of the flow) is called geostrophic motion

15 Newton’s Law Motion across Latitudes Motion along Latitude v
y (latitude) x (longitude) u Motion across Latitudes Motion along Latitude

16 Some practical rules to remember:
Fpressure Low Pressure High Pressure FCoriolis Particle will have the Coriolis force 90 degrees to the right Particles will tend to move along line of constant pressure Particles will have the high pressure on their right (same as Coriolis)

17 Hurricane IVAN H H L Fpressure H H FCoriolis

18 L H Vortices Low Pressure System High Pressure System Fpressure
FCoriolis FCoriolis Fpressure Low Pressure System High Pressure System

19 Non rotating view of Atmospheric Circulation
High Pressure Low Pressure

20 Redistribution of Heat – Large scale convective Cells
Schematic depiction of the development of the atmospheric circulation, starting from a state of rest Easterlies (Trades) Westerlies Redistribution of Heat – Large scale convective Cells

21 Easterlies (Trades) Westerlies
Schematic depiction of the development of the atmospheric circulation, starting from a state of rest Easterlies (Trades) Westerlies

22

23 Vertical view of the atmosphere
Pole Equator

24 L L H H H L L L H H H L L Polar High Subpolar Low Subtropical High
Eq. Low L L H H H L L

25 Vertical view of the atmosphere and Poleward Transport of Heat
Equator

26 Midlatitude Cyclones

27 Poleward Heat Transport

28

29

30 The seasonal cycle

31 Differential Heating From Equators to Poles

32 Next time we will see how the ocean
responds to the atmospheric wind and how it contributes to the heat transport


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