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Tricellular meridional circulation of the atmosphere
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Tri-Cellular Meridional Circulation Of The Atmosphere
INTRODUCTION
● Atmospheric pressure is defined as the weight of a column of air in an unit area measured in millibars (mb).
● The average atmospheric pressure is 1013.25 mb
● Atmospheric pressure is maximum at the sea level and the normal air pressure is taken as 76cm because it is measured in the barometer having Mercury.
● Atmospheric pressure is unevenly distributed on the earth.
● Some of the major factors responsible are:
○ Thermal difference
○ Rotation of the earth
○ Coriolis force etc
● These factors resulted into the formation of 7 pressure belts having alternate pattern of high and low pressure.
INTRODUCTION
VIDEO
VIDEO
HADLEY CELL
Hadley cell
IMAGES
IMAGES
INFORMATION
HADLEY CELL
● Location- 0°-30° north and south of equator
● Identified by- G Hadley (1735)
● Formation:
○ High insolation at equator
○ Causes air to rise forming convectional currents.
○ After reaching the height of 8-12 kms air diverge and moves polewards
(called Antitrades)
○ Antitrades descend near 30°-35° latitudes forming subtropical high
pressure belt.
○ Surface winds blowing from Subtropical High pressure belt to equatorial
low pressure belt is called Trade winds.
○ Thus, one complete meridional cell of air circulation is formed.
VIDEO
VIDEO
VIDEO
VIDEO
FERREL CELL
FERREL CELL
IMAGES
INTRODUCTION
1. This cell was first proposed by william ferrel in 1856 and hence named as ferrel cell.
2. This cell lies between the latitude of 30 degree and 65 degree.
INFORMATION
- This Cell is systematically induced in the low pressure area.
- The wind blowing from This area Known as westerlies Blowing from 30° to 35° as the Surface winds from east to west.
- This westerlies are Interrupted by land masses in N. Hemisphere where as they are smooth and fluent in S. Hemisphere
- In S. Hemisphere, this westerlies are known as roaring forties at 40° s latitude, furious fifties at 50° s latitude and shrieking sixties at 60° s latitude.
- This westerly transport warm and Hoist wind towards the pole
- This all about the information regarding the Ferrell cell
VIDEO
POLAR CELL
POLAR CELL
NOTES
POLAR CELL
- Location- 60°-90° North and South of the equator
- Polar easterlies blow from polar high-pressure belt to the sub-polar low-pressure belt
- Polar easterlies (cold) merges with the westerlies (warm) to form polar front 60°-65° latitudes
- These fronts are origin of temperate cyclone
- After converging the air ascend due to the rotation of earth at the sub polar low-pressure belt
- After reaching middle troposphere air bifurcates and move towards equator and poles
- The poleward winds descend at the poles and the polar cell is formed
VIDEO
IMAGES
CONCLUSION
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