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GCOS Ocean Biogeochemistry ECV - Oxygen

O2 is essential for nearly all multicellular life. Future projections indicate that oceanic O2 levels will decrease substantially, in part because of ocean warming and increased stratification (a process often referred to as ocean deoxygenation), but also because of increased nutrient loadings in near shore environments that lead to eutrophication. In a business-as-usual scenario, the ocean is projected to lose nearly 20% of its O2. This could have dramatic consequences for marine biogeochemistry and marine life, as the ocean’s O2 minimum zones will expand substantially, and large swaths of ocean will appear that have O2 levels that are too low for fast-swimming fish to survive, and can potentially reduce the pool of bioavailable nitrogen due to reduction of nitrate.

Product Requirements:

Interior Ocean Oxygen Concentration:

  • Frequency:  Weekly to decadal
  • Resolution:  3-20° degrees
  • Required Measurement Uncertainty:  0.5 uM - 2 uM
  • Standards/References:  See EOV specification sheets at www.ioc-goos-oopc/obs/ecv.php
  • Entity (in situ):  GOOS


Data Source: