That's pretty much it. As atomspheric Co2 content increases, more forms in the ocean to make carbonic acid and lower pHExplain how the relationship between co2 in the atmosphere and CO2 in the surface ocean has changed pH.?
Yes, the formation of carbonic acid is the cause of acidification. I would add the first dissociation step as part of the argument (H2CO3 = H+ + HCO3-), because the stable form at near neutral pH is bicarbonate; that is, it is this dissociation that causes pH to decrease under natural conditions, in ocean waters.
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