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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