All of activity of Tropical Circulation become in Tropical zone.

1. Presentation On
Climatology-I
Topics: Tropical Circulation
Md. Hanif Bhuian
Dept. Of Geography & Environment
Jagannath University
Dhaka, Bangladesh

3. Tropical Circulation
All of activity of Tropical
Circulation become in Tropical zone.
What is Tropical zone ?

4. Tropical Zone
30N & 30S
Latitude is area of
Tropical Zone.
Equatorial or tropical
front  Introtopical
convergence(ITCZ)

5. 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.

6. Characteristics of Tropical Zone
A)Doldrum(ITCZ)
B)Equatorial Westerlies
C)Trade Wind

7. 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

8. Northward (NITC)—summer solstices
21June
sun in vertical(north part)
over the tropic of cancer

9. Southward (SITC)—winter solstices
22 Dec
sun in vertical (south part)
over the tropic of Capricorn.

10. 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) .

11. Equatorial Westerlies
Wind flow westerly (West to East).
 South-Western monsoon(based on Fohn)

12. South-Western Monsoon

13. South-Western Monsoon
 30-35N latitude over the Indian ocean.

14. 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).

15.  Trade wind help
Sea merchants for sailing their ships

16. 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

17. 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

18. Equator part of Trade wind
Equator part
Humid
Because of,
atmospheric
instability
much precipitation

19. Hadley Cell
The Trade wind zone(NITC & SITC) is Hadley cell.
(basis of convective model prepared by Hadley)

21. Thanks to all of you…