Roundup: Shifting Ice Age, Plane Wrecks and Receding Streamflows

Mysterious Shifts in Ice Age Rhythms

From Science: “About 1 million years ago, one of Earth’s most important metronomes mysteriously shifted: Ice ages went from occurring every 40,000 years to every 100,000 years. At the same time, the ‘conveyor belt’ of warming currents in the North Atlantic Ocean slowed sharply. Last week, scientists at the Goldschmidt Conference presented a clue to these twin mysteries: evidence that glaciers in the Northern Hemisphere suddenly began to stick to their beds. Growing thicker, they might have triggered a cooling that disrupted the conveyor belt and allowed the 100,000-year cycle that we see today to take root.”

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The Russell Glacier in Greenland. After ancient glaciers scoured away soil and reached bedrock, they may have grown thicker, triggering a shift in the ice age cycles (Source: Jason Edwards/Getty Images).


Glacier Recession and Summer Streamflow in the Cascades

From Water Resources Research: “The Pacific Northwest (PNW) is the most highly glacierized region in the conterminous United States (858 glaciers; 466 km2)… We applied a high‐resolution glacio‐hydrological model to predict glacier mass balance, glacier area, and river discharge for the period 1960‐2099…Results show that the rate of regional glacier recession will increase, but the runoff from glacier melt and its relative contribution to streamflow display both positive and negative trends.”

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North Cascades glaciers (Source: Sean Munson/Flickr).


Melting Ice Uncovers 1946 Wreckage of U.S. Plane

From New York Times: “After an emergency landing on a Swiss glacier, the group of 12 Americans drank melted snow and survived on rations of one chocolate bar a person until daring pilots shuttled them to safety after five days marooned on the ice. Relics of that harrowing adventure and the successful rescue of all those onboard…resurfaced after more than 70 years this month when scorching summer temperatures in Europe caused the glacial ice to recede.”

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Some of the debris on Wednesday from a plane crash 70 years ago on the Gauli Glacier in Switzerland (Source: Anthony Anex/Shutterstock).

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