One explanation is that the theory that co2 makes temeratures rise is incorrect, but this is a very unpopular idea to mention. Anyone care to link to a graph that show co2 lagging temperature for the last few thousand years??

For example, labrador current is very cold but this time of year I doubt this us Greenland melt, yet hudson bay is also anomalously cold

Thanks Aabaakawad. I am specifically interested in the mechanics of how the Labrador currents interacts with the gulf stream, and if this relates to the 25% contribution of freshwater to the sub-polar arctic that is Hudson Bay runoff

Some good news for the OP however (before I get written off as unhelpful. ...!) Apparently once pH reaches 8.3, remaining limestone no longer reacts and drops out of solution....so no need to worry about 'overdosing' really.

To correct what someone said earlier....There is no acidity to neutralise, the ocean is 8.1, it was 8.2...it is alkali not acid. ..to neutralise it would be the opposite way you want....

Ok....but the idea of dumping limestone in the ocean the raise it's ph won't work because limestone reacts with acids not alkalis