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Over the past two decades scientists gained a fair understanding of where all carbon is found and how much of it circulates between atmosphere, land and sea, although significant differences can be found among authors.
As one can see, the human contribution is about 8Pg carbon per year (8Gt, billions of tons) against a global respiration rate of about 100-250Pg/y (fossil fuel alone: 2%, some say 3%).
Thus oceans stabilise the CO2 fluctuations from the seasons and the differences between ocean and land.
The oceans contain far more CO2 than air: 38,000Gt versus 700 Gt (about 50 times).
Only 0.3 Gt C/y rains down in the form of carbonate oozes of marine sediments of which a massive 30 million Gt C exists, to be circulated to the surface through ocean floor spreading, subduction and volcanic activity, which takes 100 million years.