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Mixing Layers

Mixing layers involve transporting the denser and colder deep ocean water to the surface mixed layer. As the temperature of water in the ocean decreases with depth, more CO2 and other compounds are able to dissolve in the deeper layers https://www.sciencelearn.org.nz/resources/707-ocean-temperature. This can be induced by reversing the oceanic carbon cycle through the use of large vertical pipes serving as ocean pumps https://www.newscientist.com/article/dn12698-ocean-pumps-could-counter-global-warming/, or a mixer array.http://www.johnduke.com/JDukeETCC09052007.pdf. When the nutrient rich deep ocean water is moved to the surface, algae bloom occurs, resulting in a decrease in CO2 due to carbon intake from Phytoplankton and other photosynthetic eukaryotic organisms. The transfer of heat between the layers will also cause seawater from the mixed layer to sink and absorb more CO2.

This method has not gained much traction as algae bloom harms marine ecosystems by blocking sunlight and releasing harmful toxins into the ocean. https://www.epa.gov/nutrientpollution/harmful-algal-blooms The sudden increase in CO2 on the surface level will also temporarily decrease the pH of the seawater, impairing the growth of coral reefs. The production of carbonic acid through the dissolution of CO2 in seawater hinders marine biogenic calcification and causes major disruptions to the oceanic food chain. https://soundwaves.usgs.gov/2007/01/