Which mechanism causes oxygen depletion in deep ocean layers during thermohaline circulation slowdown?

💡 Explanation

When thermohaline circulation slows, the reduced mixing decreases transport driven by density, which decreases replenishment of oxygenated surface water to depth and nutrient transport to surface. Therefore reduced mixing is the causal mechanism rather than nutrient levels, organic decomposition, or enhanced oxygen solubility which would act in other situations.

• Which topographical outcome occurs when seasonal flooding deposits sediment atop an alluvial fan?
• Which mechanism causes increased groundwater arsenic concentration in alluvial aquifers after prolonged flooding?
• Which mechanism initiates the eutrophication process in freshwater lakes experiencing agricultural runoff?
• Which crustal deformation occurs when locked fault segments rupture during an earthquake cycle along a subduction zone?
• Which effect results when intensifying trade winds strengthen the subtropical gyres in the Pacific Ocean?
• Which mechanism triggers mudflow surge on an alluvial fan after intense rainfall?