Greenland lost 12.5 billion tons of ice in one day

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At the bottom of a glacier in Greenland, climate scientists find troubling signs

At the bottom of a glacier in Greenland, climate scientists find troubling signs. On one of the hottest days this summer, locals in the tiny village of Kulusuk, Greenland heard what sounded like an explosion. It turned out to be a soccer field’s worth of ice breaking off a glacier more than five miles away.

Greenland lost 12.5 billion tons of ice to melting on August 2, the largest single-day loss in recorded history and another stark reminder of the climate crisis.

Kulusuk is also base camp for NASA’s OMG (Oceans Melting Greenland) program. OMG scientists traveled to the world’s biggest island this year after a heatwave scorched the United States and Europe, smashing temperature records and triggering the mass melting of its ice sheet.

NASA oceanographer Josh Willis and his team are investigating how the ice is being attacked not only by rising air temperatures but also by the warming ocean, which is eating it away from underneath.

A remodeled World War II DC-3 plane, now called Basler BT-57, takes a group of OMG researchers around the coast of Greenland. From the air the crew launched special probes through the ice floor, which then transmit data on temperature and salinity, which is used to plot possible sea level rises and what they would mean for humanity in the future.

“There is enough ice in Greenland to raise the sea levels by 7.5 meters, that’s about 25 feet, an enormous volume of ice, and that would be devastating to coastlines all around the planet,” said Willis. “We should be retreating already from the coastline if we are looking at many meters [lost] in the next century or two.”

NASA took CNN on a dramatic flight over Helheim — one of the largest glaciers on Greenland and the fastest flowing on the eastern edge of the island. Helheim, named after the realm of the dead in Norse mythology, is majestic, standing at more than four miles wide and roughly the height of the Statue of Liberty.

As our plane approached Helheim, the scientists spotted an ice-free “lake” at the very front of the glacier, something they said they don’t see often. The probes also brought back troubling data — Helheim was surrounded by warm water along its entire depth, more than 2,000 feet below the surface.

“It’s very rare anywhere on the planet to see 700 meters of no temperature variation, normally we find colder waters in the upper hundred meters or so, but right in front of the glacier it’s warm all the way up,” said Ian Fenty, climate scientist at NASA. “These warm waters now are able to be in direct contact with the ice over its entire face, supercharging the melting.”

Glaciers like Helheim, and even the much smaller ones around villages like Kulusuk, are powerful enough to make the global sea level rise by half a millimeter in just a month — something NASA researchers say cannot be ignored.

“Greenland has impacts all around the planet. A billion tons of ice lost here raises sea levels in Australia, in Southeast Asia, in the United States, in Europe,” Willis said. “We are all connected by the same ocean.”

By Mary Ilyushina and Frederik Pleitgen, CNN

To watch video, click:  https://edition.cnn.com/2019/08/19/weather/greenland-nasa-climate-battle-intl/index.html

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