Which mechanism accelerates the Antarctic Circumpolar Current when it encounters Drake Passage's narrow seafloor constriction?

💡 Explanation

When encountering the Drake Passage, the Antarctic Circumpolar Current undergoes geostrophic adjustment because potential vorticity must be conserved as the water column depth decreases, leading to increased current speed along the steeper sea-level gradient. Therefore, geostrophic adjustment results, rather than Ekman transport, upwelling, or advection which depend other atmospheric forcings.

• Which process causes deep-sea trench formation in ocean-continent subduction zones?
• Which landform results when isostatic rebound follows deglaciation within a fjord valley containing varying bedrock resistance?
• Which seismic phenomenon typically results along a transform plate boundary undergoing strike-slip faulting?
• Which effect primarily drives airflow deflection in upper-level jet streams within Hadley cells?
• Which risk increases when an oxbow lake forms close to agricultural land?
• Which feedback loop intensifies coastal upwelling when strong offshore winds blow parallel to the shoreline?