Which process limits dissolved oxygen level when coastal upwelling reverses direction offshore?

💡 Explanation

When upwelling reverses offshore, nutrient supply decreases and plankton blooms die off because nutrient-rich water from the deep is no longer supplied, leading to their decomposition which rapidly consumes available oxygen. Therefore decomposition rates limit oxygen, rather than wave action, bacterial respiration or photosynthetic duration themselves which have less direct immediate effect.

• Which geophysical effect occurs when a subducting oceanic plate has a rough surface with many seamounts?
• Which process accelerates when a river erodes the neck of an oxbow lake during flood stage?
• Which outcome results when increased atmospheric pressure offshore hinders coastal upwelling?
• Which process strongly reduces regional ocean surface salinity near Greenland?
• Which mechanism significantly reduces sediment deposition speed in an alluvial fan channel during a flash flood event?
• Which outcome is amplified downwind when coastal upwelling occurs?