In the context of global ocean circulation and regional climatology, what unique feature characterizes the surface currents of the northern Indian Ocean and Arabian Sea compared to the Atlantic and Pacific ocean basins?

💡 Solution & Explanation

Unlike the Atlantic and Pacific oceans where surface currents maintain relatively stable semi-permanent gyres, the northern Indian Ocean experiences a complete reversal of surface current direction every six months. During the southwest monsoon, currents flow eastward and northeastward, whereas during the northeast monsoon, they reverse to flow westward and southwestward, driven by monsoonal wind stress. The basin is not landlocked in a way that stops currents, nor does cold water flow southward from the Arctic across the equator. This unique oceanic response directly impacts regional marine productivity and coastal weather.