Ocean deoxygenation, the loss of oxygen in the ocean, results from ocean warming, through a reduction in oxygen saturation, increased oxygen consumption, increased ocean stratification and ventilation changes . In recent decades, anthropogenic inputs of nutrients and organic matter  have increased the extent, duration and intensity of coastal hypoxia events worldwide , while pollution-induced atmospheric deposition of soluble iron over the ocean has accelerated open-ocean deoxygenation . Deoxygenation and acidification often coincide because biological consumption of oxygen produces CO2. Deoxygenation can have a range of detrimental effects on marine organisms and reduce the extent of marine habitats .
IPCC
Climate Change 2022: Impacts, Adaptation and Vulnerability
IPCC Report