Data for: Increasing hypoxia on global coral reefs under ocean warming

Ocean deoxygenation is predicted to threaten marine ecosystems globally.
However, current and future oxygen concentrations and the occurrence of
hypoxic events on coral reefs remain underexplored. Here, using autonomous
sensor data to explore oxygen variability and hypoxia exposure at 32
representative reef sites, we reveal that hypoxia is already pervasive on
many reefs. 84% of reefs experienced weak to moderate (≤153 to ≤92 μmol O2
kg-1) hypoxia and 13% experienced severe (≤61 μmol O2 kg-1) hypoxia. Under
different climate change scenarios based on 4 Shared Socioeconomic
Pathways (SSPs), we show that projected ocean warming and deoxygenation
will increase the duration, intensity, and severity of hypoxia, with more
than 94% and 31% of reefs experiencing weak to moderate and severe
hypoxia, respectively, by 2100 under SSP5-8.5. This projected oxygen loss
could have negative consequences for coral reef taxa due to the key role
of oxygen in organism functioning and fitness.