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Author Topic: What's new in Greenland?  (Read 200847 times)


  • Nilas ice
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Re: What's new in Greenland?
« Reply #500 on: February 29, 2020, 11:10:47 AM »
Just at the moment on the radio:
"Greenland in the focus of the super powers"
(in German)
It is too late just to be concerned about Climate Change

Juan C. García

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Re: What's new in Greenland?
« Reply #501 on: March 18, 2020, 06:43:01 PM »
Greenland lost a near-record 600 billion tons of ice last summer, raising sea levels

Greenland’s unusually mild summer in 2019 caused the world’s largest island to lose 600 billion tons of ice in just two months, rivaling the summer of 2012 for the most ice mass lost in a single melt season, according to NASA data released Wednesday.

The mass loss from Greenland alone was enough to raise global sea levels by 2.2 millimeters, the study found.

Continuity of ice sheet mass loss in Greenland and Antarctica from the GRACE and GRACE Follow‐On missions


We examine data continuity between the GRACE and GRACE‐FO missions over Greenland and Antarctica using independent data from the mass budget method (MBM) which calculates the difference between ice sheet surface mass balance and ice discharge at the periphery. For both ice sheets, we find consistent GRACE/GRACE‐FO time series across the data gap, at the continental and regional scales, and the data gap is confidently filled with MBM data. In Greenland, the GRACE‐FO data reveal an exceptional summer loss of 600 Gigatonnes in 2019 following two cold summers. In Antarctica, ongoing high mass losses in the Amundsen Sea Embayment of West Antarctica, the Antarctic Peninsula, and Wilkes Land in East Antarctica cumulate to 2130, 560, and 370 Gigatonnes, respectively, since 2002. A cumulative mass gain of 980 Gigatonnes in Queen Maud Land since 2009, however, led to a pause in the acceleration in mass loss from Antarctica after 2016.
« Last Edit: March 18, 2020, 09:17:35 PM by Juan C. García »
Which is the best answer to Sep-2012 ASI lost (compared to 1979-2000)?
50% [NSIDC Extent] or
73% [PIOMAS Volume]

Volume is harder to measure than extent, but 3-dimensional space is real, 2D's hide ~50% thickness gone.
-> IPCC/NSIDC trends [based on extent] underestimate the real speed of ASI lost.


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Re: What's new in Greenland?
« Reply #502 on: April 10, 2020, 11:12:40 AM »
“I’m an introvert. I’m just different that’s all. I’m so sorry. I don’t have a gun. I don’t do that stuff... All I was trying to do was to become better. I’ll do it... You all are phenomenal. You are beautiful. And I love you. Try to forgive me. I’m sorry.”

Elijah McClain


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Re: What's new in Greenland?
« Reply #503 on: April 23, 2020, 01:31:26 AM »
Video of a small expedition to Humboldt Glacier last summer headed by cryo-scientist Eric Rignot.

Tor Bejnar

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Re: What's new in Greenland?
« Reply #504 on: April 24, 2020, 07:40:41 PM »
Wonderful video, Phoenix.  Yea, Humboldt!  I'll reiterate that the expedition was in 2019, just last year.
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Re: What's new in Greenland?
« Reply #505 on: April 30, 2020, 08:57:15 PM »
Catastrophic Outburst Floods Carved Greenland's 'Grand Canyon'

Buried a mile beneath Greenland's thick ice sheet is a network of canyons so deep and long that the largest of these has been called Greenland's "Grand Canyon." This megacanyon's shape suggests it was carved by running water prior to widespread glaciation, but exactly when and how the island's grandest canyon formed are topics of intense debate.

Now scientists from the U.S. and Denmark are proposing a surprising new hypothesis for the megacanyon's formation: catastrophic "outburst" floods that suddenly and repeatedly drained large meltwater-filled lakes. The findings, published this week in the journal Geology, also suggest that Greenland's subglacial canyon network has influenced the island's ice sheet since its inception.

Although repeated outburst floods have been suggested as the mechanism by which the Columbia River and other North America canyon networks formed, they had not previously been considered as the source of the remarkable landscape hidden beneath the Greenland Ice Sheet

"If the floods we propose occurred, they could have influenced ocean circulation, causing abrupt climate changes with regional and perhaps global significance," says Keisling, now a postdoctoral fellow at Lamont-Doherty Earth Observatory. "The megacanyon beneath northern Greenland also influences how ice and water flow in the subglacial environment today, which affects present-day ice-sheet stability," he says.

Modeled outburst flood during ice-sheet retreat, routed to the outlet of Petermann Glacier. The animation covers 22,000 simulated years, and pauses to highlight a large ice-dammed proglacial lake during the deglaciation.

The researchers used coupled ice-sheet and climate models to simulate the Greenland Ice Sheet's evolution over multiple glacial-interglacial cycles during the global cooling from the Pliocene into the Pleistocene, 2.58 million years ago. They found that following long periods with stable temperatures, an exceptionally warm period could cause the ice sheet to retreat rapidly. This melting led to the development of large, ice-dammed lakes in areas where the bedrock was still depressed due to the former ice sheet's weight.

The simulations eventually show the ice dams give way, leading to large outburst floods. "Over time," says Keisling, "it appears that the filling and draining of these lakes as the ice repeatedly retreated and advanced carved Greenland's megacanyons." Similar floods have been documented at the edge of other retreating ice sheets, he says
Modelled outburst flood during a deglaciation scenario routed to the outlets of the northeast Greenland ice stream (NEGIS). The animation covers 25,000 simulated years, and pauses to highlight a large ice-dammed proglacial lake during the deglaciation

Based on comparisons with modern outburst floods, the researchers estimate that it took tens to hundreds of these events to carve Greenland's largest canyon. According to Keisling, widespread sediment deposition in the water-filled basins may have also impacted the ice sheet's behavior each time it grew back.

Benjamin A. Keisling et al, Pliocene–Pleistocene megafloods as a mechanism for Greenlandic megacanyon formation, Geology (2020).
« Last Edit: April 30, 2020, 10:10:20 PM by vox_mundi »
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Re: What's new in Greenland?
« Reply #506 on: May 07, 2020, 12:10:02 AM »
I was just looking how far north there is already open water in the greenland fjords. Then i found this interesting spot with even open water in february. Rhoss fjord 72,50N27W east coast greenland west of traill island
Anybody know the background?
....somehow not able to attach a jpg or in progress.....
« Last Edit: May 07, 2020, 12:27:02 AM by Stumbi »
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Re: What's new in Greenland?
« Reply #507 on: May 25, 2020, 01:03:53 PM »
There isn't a thread for Greenland's "79 North Glacier", so I'm posting here. I expect AbruptSLR picked it up and posted it on the SL thread as the process described here is replicated in Antarctica?
How the ocean is gnawing away at glaciers
[03. February 2020]
The Greenland Ice Sheet is melting faster today than it did only a few years ago. The reason: it’s not just melting on the surface – but underwater, too. AWI researchers have now found an explanation for the intensive melting on the glacier’s underside, and published their findings in the journal Nature Geoscience.

The glaciers are melting rapidly: Greenland’s ice is now melting seven times faster than in the 1990s – an alarming discovery, since climate change will likely intensify this melting in the future, causing the sea level to rise more rapidly. Accordingly, researchers are now working to better understand the underlying mechanisms of this melting. Ice melts on the surface because it is exposed to the sun and rising temperatures. But it has now also begun melting from below – including in northeast Greenland, which is home to several ‘glacier tongues’. Each tongue is a strip of ice that has slid down into the ocean and floats on the water – without breaking off from the land ice. The longest ice tongue, part of the ‘79° North Glacier’, is an enormous 80 km long. Over the past 20 years, it has experienced a dramatic loss of mass and thickness, because it’s been melting not just on the surface, but also and especially from below.

Too much heat from the ocean
A team led by oceanographer Janin Schaffer from the Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research (AWI) in Bremerhaven has now identified the source of this intense underwater melting. The conclusions of their study, which the experts have just released in the journal Nature Geoscience, are particularly unsettling because the melting phenomenon they discovered isn’t unique to the 79° North Glacier, which means it could produce similar effects elsewhere.

For the purposes of the study, the researchers conducted the first extensive ship-based survey of the ocean floor near the glacier, which revealed the presence of a two-kilometre-wide trough, from the bottom of which comparatively warm water from the Atlantic is channelled directly toward the glacier. But that’s not all: in the course of a detailed analysis of the trough, Janin Schaffer spotted a bathymetric sill, a barrier that the water flowing over the seafloor has to overcome. Once over the hump, the water rushes down the back of the sill – and under the ice tongue. Thanks to this acceleration of the warm water mass, large amounts of heat from the ocean flow past the tongue every second, melting it from beneath. To make matters worse, the layer of warm water that flows toward the glacier has grown larger: measured from the seafloor, it now extends 15 metres higher than it did just a few years ago. “The reason for the intensified melting is now clear,” Schaffer says. “Because the warm water current is larger, substantially more warmth now makes its way under the ice tongue, second for second.”

To make matters worse, the layer of warm water that flows toward the glacier has grown larger: measured from the seafloor, it now extends 15 metres higher than it did just a few years ago. “The reason for the intensified melting is now clear,” Schaffer says. “Because the warm water current is larger, substantially more warmth now makes its way under the ice tongue, second for second.”

Other regions are also affected
In order to determine whether the phenomenon only manifests at the 79° North Glacier or also at other sites, the team investigated a neighbouring region on Greenland’s eastern coast, where another glacier, the Zachariæ Isstrøm, juts out into the sea, and where a large ice tongue had recently broken off from the mainland. Working from the surface of an ice floe, the experts measured water temperatures near the ocean floor. According to Schaffer: “The readings indicate that here, too, a bathymetric sill near the seafloor accelerates warm water toward the glacier. Apparently, the intensive melting on the underside of the ice at several sites throughout Greenland is largely produced by the form of the seafloor.” These findings will ultimately help her more accurately gauge the total amount of meltwater that the Greenland Ice Sheet loses every year.

Original publication
Janin Schaffer, Torsten Kanzow, Wilken-Jon von Appen, Luisa von Albedyll, Jan Erik Arndt and David H. Roberts: "Bathymetry constrains ocean heat supply to Greenland’s largest glacier tongue", Nature Geoscience, 3 February 2020,
DOI: 10.1038/s41561-019-0529-x - paywalled.
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Re: What's new in Greenland?
« Reply #508 on: May 26, 2020, 01:13:03 AM »
Re: isn't a thread for Greenland's "79 North Glacier",400.0.html

79N is also called Nioghalvfjerdsfjorden



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Re: What's new in Greenland?
« Reply #509 on: June 02, 2020, 09:11:54 PM »
After being empty for over a year I finally had an idea what to put on my IceSheet main page.

Maps of the bedrock or surface elevation show exactly where it is high/low, but it's still hard to estimate how much area overall is at a particular elevation level. So I created a Histogram for Greenland Ice thickness, surface elevation and bedrock elevation.

Data abstraced from:
NSIDC BedMachine v3 Greenland


Tor Bejnar

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Re: What's new in Greenland?
« Reply #510 on: June 03, 2020, 06:48:18 AM »
That's great, Tealight!
The bedrock elevation histogram reminds me of the actual (human) birth date - due date histogram which shows a normal distribution around the due date except that there is a one-day dip right at birth date = due date.  In Greenland's case, it's where bedrock elevation = sea level.  I don't think the cause is the same.  :o
Arctic ice is healthy for children and other living things.