If “Greenland is catastrophically melting”, how do alarmists clarify NASA’s rising Greenland glacier?

This photograph of a canine sled staff going via some meltwater on ice in Greenland has made headlines….but it surely’s only a snapshot of 1 place, with summer time approaching. Nothing actually all that uncommon is happening.

Local weather scientist Steffen Olsen took this image whereas travelling throughout melted sea ice in north-west Greenland (Supply: BBC UK)

Melting as summer time approaches is pure, and spikes of quick melting on account of lack of cloud cowl and clear skies are usually not unprecedented, as some overwrought folks (Invoice McKiebben involves thoughts) like to assert.

We’ve coated it earlier than in 2012 – together with the identical stage of catastrophic squawking.

Within the picture above, you possibly can see that there’s a fast batch of floor meltwater seen to satellite tv for pc. The trigger was easy, and never catastrophic. The truth is, it occurs repeatedly on century-long scales.

It turned out to be a climate occasion, unrelated to “local weather change”. The following 12 months, there was no “insta-melt“.

The truth is. we’d not even know in regards to the melting in Greenland earlier than satellites got here on the scene. So what number of instances within the historical past of the Earth has Greenland has a fast soften spike? I’m guessing lots of of 1000’s of instances.

In the meantime, NASA Earth Observatory has this to say:

Main Greenland Glacier Is Rising

June sixth, 2019 Jakobshavn Glacier in western Greenland . Picture acquired on June 6, 2019, by the Operational Land Imager (OLI) on Landsat eight, exhibits a natural-color view of the glacier.

Jakobshavn Glacier in western Greenland is infamous for being the world’s fastest-moving glacier. Additionally it is one of the vital lively, discharging an amazing quantity of ice from the Greenland Ice Sheet into Ilulissat Icefjord and adjoining Disko Bay—with implications for sea stage rise. The picture above, acquired on June 6, 2019, by the Operational Land Imager (OLI) on Landsat eight, exhibits a natural-color view of the glacier.

Jakobshavn has spent many years in retreat—that’s, till scientists noticed an surprising advance between 2016 and 2017. Along with rising towards the ocean, the glacier was discovered to be slowing and thickening. New knowledge collected in March 2019 affirm that the glacier has grown for the third 12 months in a row, and scientists attribute the change to chill ocean waters.

“The third straight 12 months of thickening of Greenland’s largest glacier helps our conclusion that the ocean is the perpetrator,” mentioned Josh Willis, an ocean scientist at NASA’s Jet Propulsion Laboratory and principal investigator of the Oceans Melting Greenland (OMG) mission.

2016 – 2019 Obtain the big JPEG picture

The maps above present how the glacier’s top modified between March 2016 and 2017 (high); March 2017 and 2018 (center); and March 2018 and 2019 (backside). The elevation knowledge come from a radar altimeter that has been flown on analysis airplanes every spring as a part of OMG. Blue areas symbolize the place the glacier’s top has elevated, in some areas by as a lot as 30 meters per 12 months.

The change is especially hanging on the glacier’s entrance (stable blue space on the left) between 2016 and 2017. That’s when the glacier superior essentially the most, changing open water and sea ice with towering glacial ice. The glacier has not superior as a lot since then, but it surely continues to gradual and thicken.

Willis in contrast the glacier’s conduct to mad putty. “Pull it from one finish and it stretches and will get thinner, or squash it collectively and it will get thicker,” he mentioned. The latter state of affairs is what is occurring now because the glacier slows down: Discover that by the third 12 months, thickening is going on throughout an more and more vast space.

Willis and colleagues suppose the glacier is reacting to a shift in a local weather sample referred to as the North Atlantic Oscillation, which has introduced chilly water northward alongside Greenland’s west coast. Measurements of the temperatures collected by the OMG staff present that the chilly water has continued.

“Even three years after the chilly water arrived, the glacier continues to be reacting,” Willis mentioned. “I’m actually excited to return this August and measure the temperature once more. Is it nonetheless chilly? Or has it warmed again up?”

NASA Earth Observatory pictures by Joshua Stevens, utilizing Landsat knowledge from the U.S. Geological Survey, and knowledge courtesy of Josh Willis/NASA JPL and the Oceans Melting Greenland (OMG) Program. Story by Kathryn Hansen.

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