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.

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