Because the deep water is associated with its high-latitude sources, a warm deep ocean during Mesozoic-Cenozoic time is a challenge; there is no feasible physical mechanism that could maintain warm subpolar surface oceans in both hemispheres. The goal of this study is to explore a hypothesis that a warm deep ocean can coexist with relatively cool subpolar (high latitude) sea surface in one hemisphere and a warmer subpolar sea surface in the other. A series of numerical ocean circulation experiments confirms that the ocean meridional circulation can keep the abyssal ocean warm despite the northern subpolar surface water staying relatively cool.

You do not currently have access to this article.