Guest Post by Willis EschenbachFollowing up on my previous investigations into the oceanic pH dataset, I’ve taken a deeper look at what the 2.5 million pH data points from the oceanographic data can tell us. Let me start with an overview of oceanic pH (the measure of alkalinity/acidity, with neutral being a pH of 7.0). Many people think that the ocean has only one pH everywhere. Other people think that the oceanic pH is different in different places, but is constant over time. Neither view is correct.First, here is a view of a transect of the north Pacific ocean...