Geography • World GeographyHard
In the context of global ocean conveyor belt circulation and regional thermohaline dynamics, how do seasonal monsoon reversals affect surface currents in the northern Indian Ocean and Arabian Sea compared to other tropical ocean basins?
A. Unlike the Atlantic and Pacific oceans where surface currents remain relatively stable, Arabian Sea surface currents undergo complete semi-annual directional reversals driven by changing monsoon winds✓ Correct Answer
B. Surface currents in the Arabian Sea remain permanently locked in a clockwise gyre due to the permanent presence of the equatorial counter-current
C. Thermohaline circulation in the Arabian Sea operates in reverse, causing cold polar bottom water to upwell directly onto tropical beaches year-round
D. Surface circulation is entirely stagnant because enclosed continental boundaries prevent wind stress from transferring momentum to ocean waters
💡 Solution & Explanation
The northern Indian Ocean is uniquely land-locked to the north, causing surface winds to reverse seasonally between southwest and northeast monsoons. This forces the Somali Current and other Arabian Sea circulation systems to completely reverse their flow direction semi-annually, unlike the steady basin-wide gyres of the Atlantic and Pacific oceans. Equatorial counter-currents do not create permanent clockwise gyres. Cold bottom water upwelling occurs seasonally during summer rather than year-round. Monsoonal wind forcing dominates upper ocean dynamics in this region.
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