Answer
The ocean removes carbon dioxide (CO2) from Earth's atmosphere through a process known as the ocean carbon pump. This pump involves several mechanisms that collectively transfer CO2 from the atmosphere into the ocean and store it there for varying periods.
1. Physical Dissolution: CO2 dissolves directly into the surface waters of the ocean through physical exchange. The ocean's surface acts as a sink for atmospheric CO2 due to the difference in concentration between the air and seawater.
2. Biological Pump: Tiny marine organisms, such as phytoplankton, play a crucial role in the removal of carbon dioxide. Phytoplankton, through photosynthesis, take up CO2 from the seawater and convert it into organic carbon. When these phytoplankton die or are consumed by other organisms, the organic carbon sinks to the deeper ocean layers, taking the stored carbon away from the atmosphere. This process is known as the biological pump.
3. Calcium Carbonate Formation: Foraminifera and other marine organisms that secrete calcium carbonate shells also contribute to carbon dioxide removal. When these organisms die, their shells sink to the ocean floor, sequestering carbon in the form of calcium carbonate sediments.
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