Examine the seasonal dynamics of surface currents and coastal upwelling in the Arabian Sea along the southwest coast of India. During the Southwest Monsoon, winds blow predominantly from the southwest, driving offshore Ekman transport. What is the immediate physical consequence of this transport on the upper ocean thermal structure near the Kerala coast?

💡 Solution & Explanation

Along the eastern boundary of the Arabian Sea during the summer monsoon, southwesterly winds generate offshore Ekman transport through Coriolis deflection, causing surface divergence. This pulls cold, nutrient-rich water from lower depths up to the continental shelf, fueling phytoplankton blooms and supporting the rich fisheries of Kerala. Downwelling occurs during the Northeast Monsoon transition when winds blow onshore. Understanding these oceanographic processes is crucial for marine resource management.