State of the Planet

News from the Columbia Climate School

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Following the Trail of Ancient Icebergs

Icebergs gouged furrows on the sea floor off Antarctica as ice sheets retreated 18,000 years ago.
Icebergs gouged furrows on the sea floor as the Antarctic ice sheet started to retreat during the last glaciation.

A few days ago we reached our main study area in the eastern Amundsen Sea. Here we are using sonar to map the contours of the seafloor in great detail. During the last glaciation the Antarctic ice sheet was much larger and covered most of the continental shelf, an underwater extension of the continent that can stretch for miles. The moving ice gouged marks into the seafloor, and those marks now tell us which way the ice was flowing. By analyzing them, we can reconstruct past ice flow. Our ultimate goal is to understand how the ice was flowing, and how fast it retreated as the earth came out of its last glaciation about 18,000 years ago.

Banner featuring a collage of extreme heat images.

Recent record-breaking heat waves have affected communities across the world. The Extreme Heat Workshop will bring together researchers and practitioners to advance the state of knowledge, identify community needs, and develop a framework for evaluating risks with a focus on climate justice. Register by June 15

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