The oceans are part of the thin, outer shell of the Earth and marine science is the study of this envelope, from the deep sea to shallow coastal oceans. These systems are dynamic and vast, containing most of the Earth's water and carbon and surface heat, and much of its biomass. Working like a machine in concert with the atmosphere, continents and ice oceans drive our climate system and support all life on our planet. Our PhD program centers around issues of biological oceanography, marine ecosystems, climate change impacts on the oceans, and marine policy and management.