State of the Planet

News from the Columbia Climate School

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Looking at Mud to Learn About Ice Sheets

Geologists inspect a fresh sediment core.  Credit: Frank Nitsche.
Geologists inspect a fresh sediment core. Credit: Frank Nitsche.

The bottom of the seafloor shows us where ice used to flow. To pinpoint when the ice retreated, the geologists on board take samples of mud and sand from the seafloor. Using a weighted steel barrel lowered to the seafloor they bore their way through sand and mud. A catcher at the bottom of the barrel prevents the sediment from falling out when the corer is hoisted up.

Sediment cores are lifted at the back of the boat.
Sediment cores are lifted at the back of the boat.

The different layers of sediment help us identify episodes of ice retreat. If we come across shells or tiny plankton fossils in the sediment we can use them to date those episodes. So far we have taken more than 20 cores and and will take several more if the weather holds.

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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Kate G
14 years ago

Wow, so cool. Makes me want to get out of the office and get a outdoors job