Which impact directly decreases nearshore oxygen levels during coastal upwelling?

💡 Explanation

Coastal upwelling brings nutrient which triggers a phytoplankton bloom; subsequent respiration during the bloom depletes oxygen via biological pump action. Therefore, bloom respiration lowers oxygen rather than offshore productivity decrease or current-driven mixing.

• Which consequence results when reduced infiltration during pedogenesis weakens soil structure?
• Which atmospheric outcome occurs when increased land surface heating disrupts Hadley cells?
• Which mechanism causes the characteristic curving path of prevailing winds?
• Which process accelerates ventifact erosion on exposed desert bedrock?
• Which risk increases when a river's flow encounters highly erodible alluvial sediments during seasonal floods?
• Which process dominates when increased glacial meltwater dilutes North Atlantic Ocean streams?