| Citation | John Marshall is a distinguished physical oceanographer. His research has focussed on important, and usually difficult, problems of the ocean circulation involving interactions between motions on different scales, using theory, laboratory experiments, and the innovative global model developed by his MIT group. Among many seminal contributions, his studies of open ocean convection ( a key component of the global circulation and hence of climate ), of the role of eddies in the maintenance of the thermocline and in the Antarctic Circumpolar Current, and of the subduction of surface waters ( an important step in the sequestration of carbon into the deep ocean ) have strongly influenced the development of physical oceanography. |