Q: In the South Atlantic and South-Eastern Pacific regions in tropical latitudes, cyclone does not originate. What is the reason?
a) Sea surface temperatures are low
b) Inter-Tropical Convergence Zone seldom occurs
c) Coriolis force is too weak
d) Absence of land in those regions
The correct answer is Option 2.
Intertropical Convergence Zone (ITZC)
- It shifts toward the north in the northern summer and toward the south in the southern summer, usually staying at or north of the equator.
- There is often no inter-tropical convergence zone (ITCZ) above the ocean and there is excessive tropospheric vertical wind shear.
- It becomes exceedingly challenging to produce tropical cyclones without an ITCZ to supply synoptic vorticity and convergence resulting in large-scale spin and thunderstorm activity as well as having severe wind shear.
- It does not move southward over the South Atlantic or South Pacific region, remaining at or close to the equator. As a result, these areas do not have the ITCZ over them, which is one of the main reasons why there aren’t any cyclones. Hence, Option 2 is correct.
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