Review: Declining oxygen in the global ocean and coastal waters ($)

Science. Oxygen levels have been declining in oceans since the middle of the 20th century, largely because of global warming phenomena and human-driven nutrient enrichment of coastal regions. These effects have enhanced microbial oxygen intake, altering the cycles of nutrients and carbon, and lowering oxygen solubility and rates of oxygen atmospheric resupply in some areas. In Breitburg et al., the causes and impact on the biological and biogeochemical processes of declining oxygen in ocean and coastal waters are discussed in detail along with possible strategies for deoxygenation management, specially monitoring strategies, documenting and predictive numerical modeling, and their possible influence on regulations and policy-making.  (Summary by Isabel Mendoza) Science 10.1126/science.aam7240