The SROCC medium confidence assessment that warming, stratification, declines in productivity and changes in plankton community in the epipelagic zone result in reduced export of primary production to deeper layers  is supported by subsequent literature . Particulate organic carbon export efficiency is constrained by altered mixing and nutrient availability , particle fragmentation  as well as viral, microbial and planktonic community structure  and metabolic rates . These processes are strongly interlinked, and their net effect on primary production export from the upper ocean remains difficult to quantify observationally . Since SROCC, there is increasing evidence that ocean deoxygenation can alter zooplankton community structure , zooplankton respiration rates  and patterns of diel vertical migration , which may focus remineralisation of organic carbon at the upper margins of OMZs .
IPCC
Climate Change 2022: Impacts, Adaptation and Vulnerability
IPCC Report