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• W3116554187 endingPage "103244" @default.
• W3116554187 startingPage "103244" @default.
• W3116554187 abstract "We investigated the effect of an artificial CO2 vent (0.0015−0.037 mol s−1), simulating a leak from a reservoir for carbon capture and storage (CCS), on the sediment geochemistry. CO2 was injected 3 m deep into the seafloor at 120 m depth. With increasing mass flow an increasing number of vents were observed, distributed over an area of approximately 3 m. In situ profiling with microsensors for pH, T, O2 and ORP showed the geochemical effects are localized in a small area around the vents and highly variable. In measurements remote from the vent, the pH reached a value of 7.6 at a depth of 0.06 m. In a CO2 venting channel, pH reduced to below 5. Steep temperature profiles were indicative of a heat source inside the sediment. Elevated total alkalinity and Ca2+ levels showed calcite dissolution. Venting decreased sulfate reduction rates, but not aerobic respiration. A transport-reaction model confirmed that a large fraction of the injected CO2 is transported laterally into the sediment and that the reactions between CO2 and sediment generate enough heat to elevate the temperature significantly. A CO2 leak will have only local consequences for sediment biogeochemistry, and only a small fraction of the escaped CO2 will reach the sediment surface." @default.
• W3116554187 created "2021-01-05" @default.
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• W3116554187 date "2021-02-01" @default.
• W3116554187 modified "2023-09-26" @default.
• W3116554187 title "Sediment acidification and temperature increase in an artificial CO2 vent" @default.
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• W3116554187 doi "https://doi.org/10.1016/j.ijggc.2020.103244" @default.
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