Declining oxygen in the global ocean and coastal waters

Date: January 8, 2018

Oxygen concentrations inboth the open ocean and coastal waters havebeen declining since at least the middle of the20th century. This oxygen loss, or deoxygenation, is one of the most important changes occurring in an ocean increasingly modified by humanactivities that have raised temperatures, CO2 levels, and nutrient inputs and have altered the abundances and distributions of marine species.

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