The book I am looking for is about the oceans. I read in in the late 1970s. It was written by a man who was participating in an ocean voyage aboard a research vessel. I think he may have been a Canadian, and the book may have been published via McGill University. He described the oceans as having four levels, each level’s current went counter to the level above or below it.

Thanks and good luck. I would love to read this book again.