World: It’s been exceptionally warm in Greenland lately and ice is melting a month early - PressFrom - US
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WorldIt’s been exceptionally warm in Greenland lately and ice is melting a month early

04:21  19 april  2019
04:21  19 april  2019 Source:   washingtonpost.com

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Spring thaw is coming exceptionally early in Greenland this year, with 50-degree This amount of ice melt is taking place about a month earlier than normal. The previous top three earliest dates " It is a very unusual situation, especially so early in the year, with very cold air and deep low pressures

It was so uncharacteristically warm that scientists, emerging from their tents high on the peak of the ice sheet, sank up to their knees in the suddenly soft snow. The melting was alarming, like nothing scientists had seen before. But no one knew exactly how unusual the event was or how worried to be .

It’s been exceptionally warm in Greenland lately and ice is melting a month early Warmth over Greenland of late is highlighted in a daily analysis from mid-April. (ClimateReanalyzer.org)

You might have heard about the exceptional heat this year in the northern hemisphere and around the world. March was just declared the second warmest on record globally

Records have been shattered in Alaska. Scotland hit 70 degrees in February. Winter warmth has torched the U.K., Netherlands and Sweden as well — coming on the heels of Europe’s warmest year on record. But they’re not alone.

Greenland is baking, too. In fact, its summer melt season has already begun — more than a month ahead of schedule.

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In fact, it is melting ahead of schedule as the world warms . With respect to Greenland , it is expected that warmer temperatures increase melting but In fact during the August 2011 weather event, melt continued throughout both day and night creating exceptionally high daily melt totals for

Each year, Greenland loses 270 billion tons of ice as the planet warms . New research shows that some of the The scientists say it appears that some of the meltwater is retained in porous ice instead of Or were they right about the total amount of melting , but some of the water was not running off?

Marco Tedesco is a professor in atmospheric sciences at the Lamont Doherty Earth Observatory of Columbia University. He monitors behavior of the cryospherethe part of earth’s water system that is frozen. He says melting of this extent shouldn’t begin until May. “The first melt event was detected on April 7,” he wrote in email.

It’s been exceptionally warm in Greenland lately and ice is melting a month early Greenland melt extent so far in 2019 compared to normal. (National Snow and Ice Data Center)

“Air temperature anomalies were up to more than 20 degrees Celsius [36 Fahrenheit] above the mean,” noted Tedesco. His team has been eyeing Greenland’s southeast coast as ground zero for the early-season thaw. “Surface air temperature jumped to 41 degrees on April 2, up from minus-11,” he said. Temperatures dropped below freezing briefly before again soaring into the 30s, where the mercury has held steady for most of the past week.

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Greenland is melting faster today than it has at any time in the last 350 years, and probably much longer, new research finds. The researchers analyzed ice cores drilled from the high-elevation center of Greenland , where each year' s snowfall melts a little bit and refreezes before being covered by a

If the entire Greenland ice sheet were to melt , it would raise global sea levels by 20 feet. Several studies lately have illustrated a disturbing fact about climate change: While the overall So they examined composite snow and ice cores from a part of Greenland ’ s Western ice sheet where the ice

What’s been sling-shotting this balmy air northward?

“The subtropical jet stream,” wrote Jennifer Francis, senior scientist at the Woods Hole Research Center in Falmouth, Mass. It’s teamed up with the polar jet to “transport warm, moist air from near Florida northward into southern Greenland,” she explained. “Locking this pattern in place has been a strong ridge — a northward bulge in the jet stream — just east of Greenland.”

A lack of ice cover in the Arctic Ocean north of Scandinavia gave this bubble of warmth a bit of an extra boost, intensifying its warm conveyor belt into Greenland.

Going forward, “[t]hese types of patterns are expected to occur more frequently,” Francis wrote, citing climate change as the culprit. “Arctic ice cover continues to dwindle and temperatures there soar.”

But advection — the transport of air, in this case warm, from somewhere else — is just half the battle. Adding insult to injury is a shortage of cloud cover in recent weeks over Greenland. The high pressure “block” that Francis described has also helped clear the skies, allowing more sunshine to pour in and heat the ground further.

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Greenland 's ice sheet is melting at a record-breaking rate, and way ahead of schedule. Climate scientists are beside themselves this month as record-breaking ice melt in Greenland devastates the nation’s ice sheet. Although it may not sound like much, it ’ s significant given how far out of season it is . Data analysts say that would be warm for July, let alone April. Given the trend, scientists are

The Greenland ice sheet (Danish: Grønlands indlandsis, Greenlandic: Sermersuaq) is a vast body of ice covering 1,710,000 square kilometres (660,000 sq mi), roughly 80% of the surface of Greenland . It is the second largest ice body in the world, after the Antarctic ice sheet.

It’s been exceptionally warm in Greenland lately and ice is melting a month early A reanalysis showing precipitation also points to where the source of warmth in Greenland is coming from. (ClimateReanalyzer.org)

“Incoming solar radiation reached a value similar to ones we observed in August last year,” wrote Tedesco. That heats the ground even more. It’s a vicious cycle of positive feedback, indicating just how unstable — and delicate — the Arctic is.

“I call this ‘melting cannibalism,” explained Tedesco. And it could get even worse, as it preconditions the ice to be more vulnerable to melting in the summer.

When snow/ice on the ground melt, they form small pools of water. That changes how reflective the surface is — a measure scientists refer to as “albedo.” Snow and ice have a very high albedo, meaning it reflects most of the incoming light that hits it. That’s why you have to wear sunglasses when you go skiing. Water, on the other hand, is a lot less shiny, which allows it to absorb more heat, a cyclical process on a local level and a driver of additional warming on the global level.

According to the National Snow and Ice Data Center, the rate of melting this early in the year has been off the charts. Satellite imagery shows several patches of extremely early melt along the coast.

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Melting Season Starts SUPER Early . Meteorologist Danielle Banks talks about how the melting season kicked off earlier than expected in Greenland The summit of the Greenland ice sheet has also been record warm . On Tuesday, it reached 20.3°F (-6.5°C) which while obviously below freezing

This was the warmest April temperature on record at that location, and it nearly set an all-time warm temperature record for Greenland as a The unusually mild weather, which was accompanied by rain, set the annual ice melt season into gear about a full month earlier than it has been recorded before.

And it’s not just Greenland. Much of the Arctic has been baking. Ice melt in Alaska has set rivers gushing more than a month before normal in some places, setting records along the Kuskokwim River in Bethel, and triggering the earliest ice breakup along the Tanana River in Nenana.

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