In 2013, Stanford Woods Institute Senior Fellow Rob Dunbar embarked on his latest research voyage to Antarctica's Southern Ocean, but this trip was very different.

Dunbar would be there not in the summer, but during the icy and turbulent fall. He was studying what happens to the carbon-rich base of the food chain when seasonal ice forms, including how much might return to the atmosphere as carbon dioxide. Dunbar's earlier research trips focused on the continent's climate history, explored by capturing sediment cores from unprecedented depths. Dunbar, the W.M. Keck Professor of Earth Science, discussed this and his previous Antarctic trips during a Feb. 10 talk at Stanford sponsored by the Stanford School of Earth Sciences and Stanford Continuing Studies.