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Global air
circulation
ATMOSPHERIC PRESSURE
Unequal heating of the
atmosphere
 The solar energy from the sun is distributed uneven across the earths surface
 Temperatures at the equator are high because incoming solar radiation is
more intense as the suns energy is more concentrated
 Temperatures at the poles are low as the incoming solar radiation is less
intense as the suns energy is less concentrated
 The difference in temperature causes
Sibisi,2017
Atmospheric
pressure
Atmospheric pressure is the weight of the atmosphere above a given place
The relationship between air
pressure and temperature
 Due to high temperatures at the equator ,the rises up into the
atmosphere. This creates low pressure .
 low pressure is associated with high precipitation
 Low temperatures at the poles causes the air to sink .this creates
high pressure (Sibisi,2017)
 High pressure is associated with cold dry conditions
 The difference in temperature and air pressure causes the air to
move horizontally and vertically
 Forming global air circulation
Global pressure zones/belts
Equatorial low pressure
Subtropical high pressure
Subpolar low pressure
Polar high pressure
global+air+circulation2.pdf
Equatorial low pressure
. Mokgopa ,2021
Located at the equator (0 degrees N &S)
Located at the equator (0 degrees N &S)
Also known as the inter tropical convergence
zone (ITCZ )Where trade winds meet.
Also known as the inter tropical convergence
zone (ITCZ )Where trade winds meet.
Associated with Hadley cell
Associated with Hadley cell
Experiences warm and wet conditions
Experiences warm and wet conditions
SUBTROPICAL HIGH pressure
Rahman,2018
Located at 35 degrees north and south
form as air above subtropics in pushed
downward.
Associated with f
Experiences hot dry conditions
Sub- Polar Low
Pressure
Saloni,& Rahman,2018
It extends 60属N and 60属S of
Equator.
Air converges and rises
Associated with tropical
westerlies
Associated with cool and moist
conditions
Polar high
pressure
Mokgopa ,2021
Located at 90 degrees North
& South
Associated with the polar cell
Air diverges and sinks
Associated with polar
easterlies
Tri-cellular circulation
Hadley cell
 between the equator and 30 degrees N and S .
 warm air rises near the equator, cools as it
travels toward the poles at high altitude, sinks as
cold air, and warms as it travels towards the
equator(Rahman,2018) .
 Produces trade winds, jet streams and
hurricanes.
Cresnick,2010
Ferrel cell
 Located between 30 and 60degrees north and
south of the equator
 Associated with high pressure
 Descending air warms by compression giving
cloudless and stable conditions
Rahman,2018
Polar cell
 LOCATED BETWEEN 60 AND
90 DEGREES N AND S
 COLD AIR SINKS CAUSING
HIGH PRESSURE
 ASSOCIATED WITH STABLE
COLD CONDITIONS
Rahman,2018
References
Cresnick.(2010).ch18 winds students. Available at deshare.net/cresnick/ch18windsstudent?
qid=2fb178a2-4ea4-48ab-b22c-4b4e53984fbf&v=&b=&from_search=2 .accessed on 20
august 2022.
Mokgopa,T.(2021).Global air circulation. Available
at:/TsiamoMokgopa/global-air-circulation-250516149 .Accessed
on 20 august 2022.
Rahman,K.(2018). General Circulation of the Atmosphere. available at:
/KhalilurRahman63/genaral-circulation-of-the-
atmosphere.Accessed on 20 august 2022.
Saloni777.(2018).pressure and winds grade11 geography. Available at
/Saloni777/pressure-and-winds-11-class-geography.
Sibisi,N.(2017). Global air circulation. available at:
/nhlanhlasibisi2/global-air-circulation. Accessed on 20 august
2022.
The end.

More Related Content

global+air+circulation2.pdf

  • 2. Unequal heating of the atmosphere The solar energy from the sun is distributed uneven across the earths surface Temperatures at the equator are high because incoming solar radiation is more intense as the suns energy is more concentrated Temperatures at the poles are low as the incoming solar radiation is less intense as the suns energy is less concentrated The difference in temperature causes Sibisi,2017
  • 3. Atmospheric pressure Atmospheric pressure is the weight of the atmosphere above a given place
  • 4. The relationship between air pressure and temperature Due to high temperatures at the equator ,the rises up into the atmosphere. This creates low pressure . low pressure is associated with high precipitation Low temperatures at the poles causes the air to sink .this creates high pressure (Sibisi,2017) High pressure is associated with cold dry conditions The difference in temperature and air pressure causes the air to move horizontally and vertically Forming global air circulation
  • 5. Global pressure zones/belts Equatorial low pressure Subtropical high pressure Subpolar low pressure Polar high pressure
  • 7. Equatorial low pressure . Mokgopa ,2021 Located at the equator (0 degrees N &S) Located at the equator (0 degrees N &S) Also known as the inter tropical convergence zone (ITCZ )Where trade winds meet. Also known as the inter tropical convergence zone (ITCZ )Where trade winds meet. Associated with Hadley cell Associated with Hadley cell Experiences warm and wet conditions Experiences warm and wet conditions
  • 8. SUBTROPICAL HIGH pressure Rahman,2018 Located at 35 degrees north and south form as air above subtropics in pushed downward. Associated with f Experiences hot dry conditions
  • 9. Sub- Polar Low Pressure Saloni,& Rahman,2018 It extends 60属N and 60属S of Equator. Air converges and rises Associated with tropical westerlies Associated with cool and moist conditions
  • 10. Polar high pressure Mokgopa ,2021 Located at 90 degrees North & South Associated with the polar cell Air diverges and sinks Associated with polar easterlies
  • 12. Hadley cell between the equator and 30 degrees N and S . warm air rises near the equator, cools as it travels toward the poles at high altitude, sinks as cold air, and warms as it travels towards the equator(Rahman,2018) . Produces trade winds, jet streams and hurricanes. Cresnick,2010
  • 13. Ferrel cell Located between 30 and 60degrees north and south of the equator Associated with high pressure Descending air warms by compression giving cloudless and stable conditions Rahman,2018
  • 14. Polar cell LOCATED BETWEEN 60 AND 90 DEGREES N AND S COLD AIR SINKS CAUSING HIGH PRESSURE ASSOCIATED WITH STABLE COLD CONDITIONS Rahman,2018
  • 15. References Cresnick.(2010).ch18 winds students. Available at deshare.net/cresnick/ch18windsstudent? qid=2fb178a2-4ea4-48ab-b22c-4b4e53984fbf&v=&b=&from_search=2 .accessed on 20 august 2022. Mokgopa,T.(2021).Global air circulation. Available at:/TsiamoMokgopa/global-air-circulation-250516149 .Accessed on 20 august 2022. Rahman,K.(2018). General Circulation of the Atmosphere. available at: /KhalilurRahman63/genaral-circulation-of-the- atmosphere.Accessed on 20 august 2022. Saloni777.(2018).pressure and winds grade11 geography. Available at /Saloni777/pressure-and-winds-11-class-geography. Sibisi,N.(2017). Global air circulation. available at: /nhlanhlasibisi2/global-air-circulation. Accessed on 20 august 2022.