Which mechanism causes increased ocean atmospheric CO2 absorption during coastal upwelling events?

💡 Explanation

During upwelling, nutrient-rich deep water rises, fueling phytoplankton blooms; photosynthesis then converts CO2 into organic matter, which settles to the ocean floor upon their death, effectively sequestering it. Therefore, increased CO2 absorption results, rather than other options which affect other separate mechanisms on the ocean.

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