As a result of the interaction between biological cycles and the abyssal circulation, the modem North Pacific Ocean bas a lower degree of calcite saturation (Ω) and a shallower carbonate compensation depth (and lysocline) than does the North Atlantic….
Bender, Michael L., and David W. Graham. 1978. "Long term constraints on the global marine carbonate system." Journal of Marine Research 36, (3). https://elischolar.library.yale.edu/journal_of_marine_research/1443