Ocean Deoxygenation


As the ocean rises in temperature due to global warming, the upper layers of the ocean become less dense, and the upwelling of nutrients from the denser, lower layers of the ocean declines. Most photosynthesis in the ocean occurs in the upper layers, so the decline in nutrients results in a decline in photosynthesis, resulting in a lowering of oxygen in those upper regions.

In addition, oxygen is less soluble in warmer water than cold, resulting in a lowering of oxygen in the ocean, as the ocean is warmed due to increased global temperature.