Green Sahara’s Ancient Rainfall Regime Revealed
What is now the Sahara Desert was the home to hunter-gathers who made their living off the animals and plants that lived in the region’s savannahs and wooded grasslands 5,000 to 11,000 years ago.
Radar Reveals Meltwater’s Year-Round Life Under Greenland Ice
Meltwater from the Greenland ice sheet can travel through channels to reach bedrock; a new study led by a Lamont-Doherty Earth Observatory graduate student shows where the water goes.
State of the Arctic: Longer Melting Seasons, Thinning Sea Ice
Marco Tedesco, a glaciologist at Columbia University’s Lamont-Doherty Earth Observatory and the lead author of the Arctic Report Card chapter on Greenland, discusses some of the changes he has been seeing in Greenland.
Most of Greenland Ice Melted to Bedrock in Recent Geologic Past, Study Says
Bedrock drilled from deep under the Greenland ice sheet contains evidence that the island was nearly denuded of ice for an extended time during the last million years. The finding suggests that the ice sheet is more vulnerable than thought.
Where Trees Meet Tundra, Decoding Signals of Climate Change
Columbia University’s Lamont-Doherty Earth Observatory and other institutions are engaged in a long-term project to sort out what allows trees to survive or not in the borderline environment of the far north.