The salinity contrast between the Atlantic and Pacific oceans during glacial time

In today's ocean the salinity of low‐latitude surface waters in the Pacific is on the average 1 per mil lower than in the Atlantic. Oxygen isotope records for planktonic foraminifera suggest that an even larger salinity deficit may have existed for Pacific surface water during glacial time. If so, the transport of water vapor from the Atlantic to the Pacific must have been as strong as or even stronger. To balance the tendency toward salt buildup the Atlantic would have had to export, during glacial time, waters saltier than it received from the other oceans.