 . New findings since SROCC also confirm that the volume of oxygen minimum zones  are expanding at many locations  . The most recent estimates of future oxygen loss in the subsurface ocean , using CMIP6 models, amount to -4.1 + 4.2 , -6.6 + 5.7, -10.1 + 6.7 and -11.2 + 7.7% in 2081-2100 relative to 1995-2014 for SSP1-2.6, SSP2-4.5, SSP3-7.0 and SSP5-8.5, respectively . Based on these CMIP6 projections, WGI AR6 concludes that the oxygen content of the subsurface ocean is projected to decline to historically unprecedented conditions over the 21st century  . These declines are greater  than simulated by the CMIP5 models in their Representative Concentration Pathway  analogues, a likely consequence of enhanced surface warming and stratification in CMIP6 models . At the regional scale and for subsurface waters, projected changes are not spatially uniform, and there is lower agreement among models than they show for the global mean trend . In particular, large uncertainties remain for these future projections of ocean deoxygenation in the subsurface tropical oceans, where the major OMZs are located .
IPCC
Climate Change 2022: Impacts, Adaptation and Vulnerability
IPCC Report