In the South Atlantic and South-Eastern Pacific regions in tropical latitudes, cyclone does not originate. What is the reason ?
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A.
Sea surface temperatures are low
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B.
Inter-tropical Convergence Zone seldom occurs
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C.
Coriolis force is too weak
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D.
Absence of land in those regions
Correct Answer:
A. Sea surface temperatures are low
Explanation:
The correct answer is (a) Sea surface temperatures are low.
Explanation:
Tropical cyclones require specific conditions to form, the most important being warm sea surface temperatures of at least 27°C over a sufficiently large area.
In the South Atlantic and South-Eastern Pacific tropical latitudes, the sea surface temperatures tend to be below this threshold, which is inadequate for cyclone formation.
Other conditions needed for tropical cyclones include the Coriolis force for spin, low vertical wind shear, a pre-existing disturbance, and upper air divergence. While other factors like Coriolis force exist, the critical limiting factor in these regions is the low sea surface temperature.
Additionally, cold ocean currents in these regions lower the surface temperature, further preventing cyclones from originating here.
Thus, the absence of sufficiently warm sea surface temperatures prevents cyclones from originating in the South Atlantic and South-Eastern Pacific tropical regions, making option (a) the correct choice
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