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Ocean deoxygenation, Causes behind Ocean Deoxygenation
The loss of oxygen…
Ocean deoxygenation
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• The ocean gains oxygen in the upper layer due to photosynthesis by autotrophic organisms and oxygen from the atmosphere dissolving in the under-saturated waters.
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• This equilibrium has disturbed in the recent decades. The global ocean oxygen inventory losses from 1960 to 2010 are close to 2%.
• Volume of areas depleted of oxygen, known as“anoxic waters”, have quadrupled.
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Impact
• On Climate Change- decreasing oxygen concentrations will increase greenhouse gas emission with increased release of methane and N2O.
• On Feedback mechanisms- Oxygen loss is directly related to carbon and other nutrient cycles in the sediments.
e.g. The recycling of phosphorus (P) in marine systems is enhanced when oxygen in sea water is low. The resulting increased availability of phosphorous can further enhance productivity and, upon sinking of the organic matter, enhance the oxygen demand in deeper waters. This positive feedback-loop between productivity, oxygen loss and increased P availability can contribute to further deoxygenation
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