The circulation of the deep ocean is often described as a "Great Conveyor Belt" in which surface waters sink into the abyss in the North Atlantic (North Atlantic Deep Water, NADW) and flow southward to Antarctica eventually moving northward again into the deep North Pacific (becoming NPDW).
a. Imagine that the Δ14C depletion of the deep ocean is recorded in deep ocean sediments and that during the last ice age the Δ14C of the deep Pacific was -300%o (permil). Was the circulation of the deep ocean faster of slower during the ice age? Explain your reasoning.