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depends strongly on oil and gas prices. In this regard, the literature basis for this report does not take into account the rise in world oil and gas prices since 2003 and assumes oil prices of 15–20 US$ per barrel. Should higher prices be sustained over the life of a CCS project, the economic value of CO2 could be higher than that reported here. 6. Ocean storage A potential CO2 storage option is to inject captured CO2 directly into the deep ocean (at depths greater than 1,000 m), where most of it would be isolated from the atmosphere for centuries. This can be achieved by transporting CO2 via pipelines or ships to an ocean storage site, where it is injected into the water column of the ocean or at the sea floor. The dissolved and dispersed CO2 would subsequently become part of the global carbon cycle. Figure TS.9 shows some of the main methods that could be employed. Ocean storage has not yet been deployed or demonstrated at a pilot scale, and is still in the research phase. However, there have been small- scale field experiments and 25 years of theoretical, laboratory and modelling studies of intentional ocean storage of CO2. Technical Summary 37 Storage mechanisms and technology CO2 /CaCO3 reactor Flue gas Captured and compressed CO2 Dispersal of CO2 /CaCO3 mixture Dispersal of CO2 by ship CO2 lake Refilling ship Rising CO2 plume Sinking CO2 plume CO2 lake Figure TS.9. Methods of ocean storage. Figuur TS.9 Oceans cover over 70% of the earth’s surface and their average depth is 3,800 m. Because carbon dioxide is soluble in water, there are natural exchanges of CO2 between the atmosphere and waters at the ocean surface that occur until equilibrium is reached. If the atmospheric concentration of CO2 increases, the ocean gradually takes up additional CO2. In this way, the oceans have taken up about 500 GtCO2 (140 GtC) of the total 1,300 GtCO2 (350 GtC) of anthropogenic emissions released to the atmosphere over the past 200 years. As a result of the increased atmospheric CO2 concentrations from human activities relative to pre-industrial levels, the oceans are currently taking up CO2 at a rate of about 7 GtCO2 yr-1 (2 GtC yr-1). Most of this carbon dioxide now resides in the upper ocean and thus far has resulted in a decrease in pH of about 0.1 at the ocean surface because of the acidic nature of CO2 in water. To date, however, there has been virtually no change in pH in the deep ocean. Models predict that over the next several centuries the oceans will eventually take up most of the CO2 released to the atmosphere as CO2 is dissolved at the ocean surface and subsequently mixed with deep ocean waters. 3 kmPDF Image | CARBON DIOXIDE CAPTURE AND STORAGE
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