Applying Understanding of Earth Systems, Including Climate Change, to Exploration of Other Ocean Worlds

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Earth’s polar and deep ocean systems and how they are affected by environmental changes provide analogs for understanding key processes acting in other ocean worlds, from physical and geological dynamics to chemical and biological processes. Subglacial lakes in Antarctica that are overlain by multiple kilometers of ice, as well as polar ice shelves underlain by subsurface areas of the ocean, are key sites for studying processes operating at ice-water and rock-ocean interfaces on Earth and on icy worlds. Hydrothermal vents at the seafloor release chemicals that provide energy for life and are also key areas for cross-linked Earth and planetary studies relevant to deep oceans dynamics. The presence of chemosynthetic microbes that are then consumed by multicellular life forms provide an analog for examining the potential existence of life in some subregions within ocean worlds. Here, we discuss the various Earth system processes that may have analogs on other ocean worlds and the benefits of collaborative Earth and planetary science investigations.