page_title: Hypoxia (environmental)
hierarchical_section_title: Hypoxia (environmental)
caption_attribution_description: English: Global areas of hypoxia Global map of low and declining O2 levels in the open ocean and coastal waters from Breitburg et al. (2018). The global map indicates coastal sites where anthropogenic nutrients have exacerbated or caused O2 declines to &lt;2 mg L–1 (&lt;63 μmol L–1) (red dots), as well as ocean O2 minimum zones at 300 m (blue shaded regions). Breitburg, D., Levin, L. A., Oschlies, A., Gregoire, M., Chavez, F. P., and Conley, D. J. (2018) "Declining oxygen in the global ocean and coastal waters". Science, 359: eaam7240. {{doi:10.1126/science.aam7240}}.
context_page_description: Hypoxia refers to low oxygen conditions. Normally, 20.9% of the gas in the atmosphere is oxygen. The partial pressure of oxygen in the atmosphere is 20.9% of the total barometric pressure. In water, oxygen levels are much lower, approximately 7 ppm 0.0007% in good quality water, and fluctuate locally depending on the presence of photosynthetic organisms and relative distance to the surface.
context_section_description: Hypoxia refers to low oxygen conditions. Normally, 20.9% of the gas in the atmosphere is oxygen. The partial pressure of oxygen in the atmosphere is 20.9% of the total barometric pressure. In water, oxygen levels are much lower, approximately 7 ppm 0.0007% in good quality water, and fluctuate locally depending on the presence of photosynthetic organisms and relative distance to the surface (if there is more oxygen in the air, it will diffuse across the partial pressure gradient).
caption: Global areas of ocean hypoxia 2009 Global map of low and declining oxygen levels in the open ocean and coastal waters.[1] The map indicates coastal sites where anthropogenic nutrients have exacerbated or caused oxygen declines to <2 mg/l (<63 μmol/l) (red dots), as well as ocean oxygen minimum zones at 300 m (blue shaded regions).[2]
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