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Presentation On 
Climatology-I 
Topics: Tropical Circulation 
Md. Hanif Bhuian 
Dept. Of Geography & Environment 
Jagannat...
Tropical Circulation 
All of activity of Tropical 
Circulation become in Tropical zone. 
What is Tropical zone ?
Tropical Zone 
30N & 30S 
Latitude is area of 
Tropical Zone. 
Equatorial or tropical 
front  Introtopical 
convergen...
Region of ITCZ 
 North Introtopical 
Convergence (NITC) 
 Region of N.E. Trade 
wind (blow from N sub-tropical 
HP to NI...
Characteristics of Tropical Zone 
A)Doldrum(ITCZ) 
B)Equatorial Westerlies 
C)Trade Wind
Doldrum(ITCZ) 
Trough– Belt of Equatorial 
low pressure( 5N to 5S) 
 This Trough is Doldrum. 
Variation 
northward(N...
Northward (NITC)—summer solstices 
21June 
sun in vertical(north part) 
over the tropic of cancer
Southward (SITC)—winter solstices 
22 Dec 
sun in vertical (south part) 
over the tropic of Capricorn.
3 Zones of Doldrum(based on Crowe) 
Indo-pacific doldrum(eastern coast of Africa. 
Equatorial western (coastal region of...
Equatorial Westerlies 
Wind flow westerly (West to East). 
 South-Western monsoon(based on Fohn)
South-Western Monsoon
South-Western Monsoon 
 30-35N latitude over the Indian ocean.
Trade Wind 
Wind flow from sub-tropical 
HP to Equatorial 
low pressure belt(ITC) 
 Direction 
N.E. direction 
-- North...
 Trade wind help 
Sea merchants for sailing their ships
Deflection of Trade wind 
 Freels Law – Based on 
carioles force rotation of the 
Earth. 
Trade wind deflected– 
Right i...
Weather Condition of Trade wind 
 Polar part or Eastern 
site – sub-tropical 
anticyclone are Dry. 
Because of, 
 Strong...
Equator part of Trade wind 
Equator part 
Humid 
Because of, 
atmospheric 
instability 
much precipitation
Hadley Cell 
The Trade wind zone(NITC & SITC) is Hadley cell. 
(basis of convective model prepared by Hadley)
Thanks to all of you…
Tropical circulation
Tropical circulation
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Tropical circulation

All of activity of Tropical Circulation become in Tropical zone.

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Tropical circulation

  1. 1. Presentation On Climatology-I Topics: Tropical Circulation Md. Hanif Bhuian Dept. Of Geography & Environment Jagannath University Dhaka, Bangladesh
  2. 2. Tropical Circulation All of activity of Tropical Circulation become in Tropical zone. What is Tropical zone ?
  3. 3. Tropical Zone 30N & 30S Latitude is area of Tropical Zone. Equatorial or tropical front  Introtopical convergence(ITCZ)
  4. 4. Region of ITCZ  North Introtopical Convergence (NITC)  Region of N.E. Trade wind (blow from N sub-tropical HP to NITC. South Introtopical Convergence(SITC) Region of S.E. Trade wind(blow from S sub-tropical HP to SITC.
  5. 5. Characteristics of Tropical Zone A)Doldrum(ITCZ) B)Equatorial Westerlies C)Trade Wind
  6. 6. Doldrum(ITCZ) Trough– Belt of Equatorial low pressure( 5N to 5S)  This Trough is Doldrum. Variation northward(NITC) – summer solstices. -- 21june southward(SITC) –winter solstices. -- 22Dec
  7. 7. Northward (NITC)—summer solstices 21June sun in vertical(north part) over the tropic of cancer
  8. 8. Southward (SITC)—winter solstices 22 Dec sun in vertical (south part) over the tropic of Capricorn.
  9. 9. 3 Zones of Doldrum(based on Crowe) Indo-pacific doldrum(eastern coast of Africa. Equatorial western (coastal region of Africa). Western coastal(region of central America) .
  10. 10. Equatorial Westerlies Wind flow westerly (West to East).  South-Western monsoon(based on Fohn)
  11. 11. South-Western Monsoon
  12. 12. South-Western Monsoon  30-35N latitude over the Indian ocean.
  13. 13. Trade Wind Wind flow from sub-tropical HP to Equatorial low pressure belt(ITC)  Direction N.E. direction -- Northern hemisphere(NITC). S.E. direction -- Southern hemisphere(SITC).
  14. 14.  Trade wind help Sea merchants for sailing their ships
  15. 15. Deflection of Trade wind  Freels Law – Based on carioles force rotation of the Earth. Trade wind deflected– Right in the northern hemisphere Left in the southern hemisphere
  16. 16. Weather Condition of Trade wind  Polar part or Eastern site – sub-tropical anticyclone are Dry. Because of,  Strong atmospheric stability  Strong inversion of temperature  Clear sky
  17. 17. Equator part of Trade wind Equator part Humid Because of, atmospheric instability much precipitation
  18. 18. Hadley Cell The Trade wind zone(NITC & SITC) is Hadley cell. (basis of convective model prepared by Hadley)
  19. 19. Thanks to all of you…

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