Increasing atmospheric concentrations of greenhouse gases are suspected of causing a gradual warming of the Earth’s surface and potentially disastrous changes to global climate. Because CO2 is a major greenhouse gas, CO2 ocean sequestration is being explored as one possible option to limit the accumulation of greenhouse gases in the atmosphere. In the case of CO2 ocean sequestration, an assessment of environmental impacts to the ocean is the most important issue. Sequestration research requires a development of new cost-effective observation techniques to monitor dilution and diffusion of the sequestrated CO2. We developed an in-situ pH/pCO2 sensor, a tracking neutral buoy system and a towing multi-layer monitoring system to observe the pH change, water movement and diffusion at a mid-depth of the ocean as an environmental assessment technique for CO2 ocean sequestration.

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