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Author Topic: Zachariae Isstrøm / Nioghalvfjerdsfjorden / NE Greenland  (Read 394923 times)

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Re: Zachariae Isstrøm / Nioghalvfjerdsfjorden / North East Greenland
« Reply #1000 on: September 20, 2019, 04:33:20 PM »
Wow, those are incredible pictures, especially the ones showing the calved icebergs.

Massive tabular icebergs. You cannot get a sense of scale from the satellite pictures. The photos are awesome!

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Re: Zachariae Isstrøm / Nioghalvfjerdsfjorden / North East Greenland
« Reply #1001 on: September 21, 2019, 07:08:25 PM »
Espen,
thanks for sharing these beautiful and amazing pictures with us!
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Re: Zachariae Isstrøm / Nioghalvfjerdsfjorden / North East Greenland
« Reply #1002 on: September 21, 2019, 07:55:46 PM »
Here is another present from Linette Boisvert and her colleagues at the NASA Operation IceBridge, it is a video showing the fligth from where the images (above) ended: 
« Last Edit: September 21, 2019, 09:24:58 PM by Espen »
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Re: Zachariae Isstrøm / Nioghalvfjerdsfjorden / North East Greenland
« Reply #1003 on: September 21, 2019, 11:53:45 PM »
  Great stuff Espen thank you. Wow just wow covers it.

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Re: Zachariae Isstrøm / Nioghalvfjerdsfjorden / North East Greenland
« Reply #1004 on: September 24, 2019, 02:19:14 PM »
At the risk of looking a gift horse in the mouth, where can we find links to higher resolution versions?

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Re: Zachariae Isstrøm / Nioghalvfjerdsfjorden / North East Greenland
« Reply #1005 on: September 24, 2019, 02:48:57 PM »
At the risk of looking a gift horse in the mouth, where can we find links to higher resolution versions?

WYSIWYG
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Re: Zachariae Isstrøm / Nioghalvfjerdsfjorden / North East Greenland
« Reply #1006 on: September 24, 2019, 03:11:50 PM »
And again all credits to Linette Boisvert and the NASA Ice Bridge Team here is a row of photos from Nioghalvfjerdsfjorden where Lambert Land is seen from the northside :
« Last Edit: September 24, 2019, 03:18:36 PM by Espen »
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Re: Zachariae Isstrøm / Nioghalvfjerdsfjorden / North East Greenland
« Reply #1007 on: September 24, 2019, 03:16:57 PM »
More images:
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Re: Zachariae Isstrøm / Nioghalvfjerdsfjorden / North East Greenland
« Reply #1008 on: September 24, 2019, 03:18:03 PM »
And a few more:
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Re: Zachariae Isstrøm / Nioghalvfjerdsfjorden / North East Greenland
« Reply #1009 on: October 03, 2019, 06:29:54 PM »
Breaking News
I have been waiting for this to happen for a while, but via other sources I can now see the calving session is underway, this calving session could well be the largest calving session since Zachariae Isstrøm was separated from the former tongue in 2012, it could be larger than the well known calving session at Jakobshavn Isbræ in August 14 - 16 2015. My prelimerary estimates is it could be up to 13 km2.

The animation below show: The potential calving area is marked with red color. And the animation in the black box show the calving event at Jakobshavn Isbræ August 14 - 16 2015 (same scale).

You need to click on the image to animate and enlarge!
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Re: Zachariae Isstrøm / Nioghalvfjerdsfjorden / North East Greenland
« Reply #1010 on: October 03, 2019, 08:15:49 PM »
Thanks for this information  - the first breaking news since I visit this forum.
Let's look which part will break down and whether this will be one big simple event or a row of consecutive smaller calvings. Any guess when it will happen?
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Re: Zachariae Isstrøm / Nioghalvfjerdsfjorden / North East Greenland
« Reply #1011 on: October 03, 2019, 09:08:32 PM »
Thanks for this information  - the first breaking news since I visit this forum.
Let's look which part will break down and whether this will be one big simple event or a row of consecutive smaller calvings. Any guess when it will happen?
Hello Stephan the reason I call it a session, is to avoid some clever persons arguing about the size of the calving, because most calvings or 99,9...% is more than just one action it is a series of actions. It will for sure be a large calving, how large we will see? The calving session as I see it has allready started.
« Last Edit: October 03, 2019, 09:23:47 PM by Espen »
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Re: Zachariae Isstrøm / Nioghalvfjerdsfjorden / North East Greenland
« Reply #1012 on: October 03, 2019, 10:11:05 PM »
Zachariae Isstrøm - Here is animation showing the massive retreat over the years at this impressive glacier:
Beware this animation is very large you need to click on the image to animate and enlarge!!
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Re: Zachariae Isstrøm / Nioghalvfjerdsfjorden / NE Greenland
« Reply #1013 on: October 04, 2019, 07:46:48 AM »
Amazing, the cracks of today's calving front already existed in 1999.  :o
« Last Edit: October 04, 2019, 10:03:02 AM by Neven »
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Re: Zachariae Isstrøm / Nioghalvfjerdsfjorden / NE Greenland
« Reply #1014 on: October 04, 2019, 12:32:24 PM »
Amazing, the cracks of today's calving front already existed in 1999.  :o

No not really, the reason is I made the 1999 material slightly transparent :)
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Re: Zachariae Isstrøm / Nioghalvfjerdsfjorden / NE Greenland
« Reply #1015 on: October 04, 2019, 01:22:50 PM »
Yeah, I thought it was transparency. But the 3 melt lakes in the upper left were in exact same location 20 years ago. It's the underlying topography of course, but still notable.

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Re: Zachariae Isstrøm / Nioghalvfjerdsfjorden / NE Greenland
« Reply #1016 on: October 04, 2019, 01:53:30 PM »
Yeah, I thought it was transparency. But the 3 melt lakes in the upper left were in exact same location 20 years ago. It's the underlying topography of course, but still notable.

And notice the sea ice outside the island barrier in 1999, 3 years later in 2002 all the sea ice broke up including the Zach Bay area, letting a lot of debris out of the bay trap, probably one big reason for the retreat and different calving activity at Zachariae Isstrøm later, the backpressure was not there anymore.
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Re: Zachariae Isstrøm / Nioghalvfjerdsfjorden / NE Greenland
« Reply #1017 on: October 04, 2019, 02:45:21 PM »
Amazing, the cracks of today's calving front already existed in 1999.  :o

No not really, the reason is I made the 1999 material slightly transparent :)

LOL that makes sense. I was wondering how it could survive so long. Thanks for clarification, Espen.
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Re: Zachariae Isstrøm / Nioghalvfjerdsfjorden / NE Greenland
« Reply #1018 on: October 07, 2019, 10:14:00 PM »
The southern portion calved today.

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Re: Zachariae Isstrøm / Nioghalvfjerdsfjorden / NE Greenland
« Reply #1019 on: October 09, 2019, 08:37:47 AM »
Another one:
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Re: Zachariae Isstrøm / Nioghalvfjerdsfjorden / NE Greenland
« Reply #1020 on: October 09, 2019, 11:12:37 AM »
With all that warm water underneath, how long into the fall/winter can we expect this to continue??  Can this break to the first grounding line in the near future?  Isn't that a  somewhat scary eventuality?

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Re: Zachariae Isstrøm / Nioghalvfjerdsfjorden / NE Greenland
« Reply #1021 on: October 09, 2019, 03:04:25 PM »
A day later:
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Re: Zachariae Isstrøm / Nioghalvfjerdsfjorden / NE Greenland
« Reply #1022 on: October 24, 2019, 04:37:12 PM »
More calving has taken place....waiting for higher-resolution Sentinel-1 IW acquisition.

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Re: Zachariae Isstrøm / Nioghalvfjerdsfjorden / NE Greenland
« Reply #1023 on: February 11, 2020, 10:58:40 AM »
Bathymetry constrains ocean heat supply to Greenland’s largest glacier tongue:


https://www.nature.com/articles/s41561-019-0529-x.epdf
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Re: Zachariae Isstrøm / Nioghalvfjerdsfjorden / NE Greenland
« Reply #1024 on: March 27, 2020, 10:36:06 AM »
First signs of movement on Polarview or just the angle of the shot?


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Re: Zachariae Isstrøm / Nioghalvfjerdsfjorden / NE Greenland
« Reply #1027 on: July 01, 2020, 06:50:22 PM »
And here is the long awaited calving at Spaltegletscher:

Click on image to animate!
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Re: Zachariae Isstrøm / Nioghalvfjerdsfjorden / North East Greenland
« Reply #1028 on: July 02, 2020, 10:39:13 AM »
Several Danish newspaper are spreading a "canard" involving Jason Box, claiming Spaltgletscher calved, which did not happen, as usual papers gets all the facts wrong:

http://www.b.dk/nationalt/isflage-river-sig-loes-efter-groenlandsk-varmerekord

http://jyllands-posten.dk/indland/trafik/ECE8999622/gigantisk-groenlandsk-isflage-har-revet-sig-loes-efter-varmerekord/

Indeed some 3 years and 10 month's ago since the last discussion.  This time the whole foot has become detatched at the ankle. I wonder if it will even get picked up in today's new cycle...

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Re: Zachariae Isstrøm / Nioghalvfjerdsfjorden / NE Greenland
« Reply #1029 on: July 03, 2020, 01:31:05 PM »
The whole north leg of the glacier seems to detach. The 79N glacier is said to be anchored at Lynn O, and the small islands that stretch from north to south. If the Spaltegletscher part detaches, the sun-warmed seawater can attack the anchorpoint from the back. We might see a Vavilov ice cap like collapse on an enormous scale.

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Re: Zachariae Isstrøm / Nioghalvfjerdsfjorden / NE Greenland
« Reply #1030 on: July 06, 2020, 10:24:09 AM »
A massive calving sequence happened from June 29  to July 5 at Zachariae Isstrøm, it was almost involving the whole calving front about 18 km and some +10 km2 of debris.

Please click on image to animate!
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Re: Zachariae Isstrøm / Nioghalvfjerdsfjorden / NE Greenland
« Reply #1031 on: July 06, 2020, 10:38:37 AM »
More action in the vicinity of the former:

Please click to animate!
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Re: Zachariae Isstrøm / Nioghalvfjerdsfjorden / NE Greenland
« Reply #1032 on: July 06, 2020, 11:29:59 AM »
Impressive. It waited all those years, but then went all at once.
I wonder if this will affect the big neighbor 79N. In principle it could help speed it up, due to removal of some resistance, but not sure if the effect is significant.

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Re: Zachariae Isstrøm / Nioghalvfjerdsfjorden / NE Greenland
« Reply #1033 on: July 06, 2020, 06:57:26 PM »
Impressive. It waited all those years, but then went all at once.
I wonder if this will affect the big neighbor 79N. In principle it could help speed it up, due to removal of some resistance, but not sure if the effect is significant.

I dont expect anything unsual from this event, but I am surprised the calves could depart that easily I expected them be grounded all these years.
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Re: Zachariae Isstrøm / Nioghalvfjerdsfjorden / NE Greenland
« Reply #1034 on: July 10, 2020, 08:03:13 PM »
A massive calving sequence happened from June 29  to July 5 at Zachariae Isstrøm, it was almost involving the whole calving front about 18 km and some +10 km2 of debris.

Intresting that three meltponds about 10km upstream drained simultaneously with this calving

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Re: Zachariae Isstrøm / Nioghalvfjerdsfjorden / NE Greenland
« Reply #1035 on: July 11, 2020, 03:20:48 PM »
That is the floating part of the glacier. The grounding is way up, at the west outlet of lake Blaso. There is a 900! m trench below it, and the ice tongue we se from lake Blaso to the sea outlet is tapering from 500 m to 50 m at the end. There is a very good discussion of the underwater topography in this book. https://books.google.hu/books?id=BgQmDwAAQBAJ&pg=PA90&lpg=PA90&dq=Bl%C3%A5s%C3%B8+lake+greenland&source=bl&ots=Pv8y-pE18Z&sig=ACfU3U3LOSWeWlq_bNWEphlwQoOBJlJosA&hl=en&sa=X&ved=2ahUKEwjOpcqV_rDqAhVTVsAKHSchCo8Q6AEwAnoECAgQAQ#v=onepage&q=Bl%C3%A5s%C3%B8%20lake%20greenland&f=false

This is the main reason why i fear for an ice stream starting here. The 79N is held back by the island chain and it rests on some 100 m thick ice. But the calving of the Splaltegletscher brougth the sun warmed sea water front 20 km closer to the back end of the 79N main stream, that is only 50 m thick. There is documented history of the gletscher surging, when it calves back behind the NOIB. See fig 4.16 in the link.

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Re: Zachariae Isstrøm / Nioghalvfjerdsfjorden / NE Greenland
« Reply #1036 on: July 20, 2020, 08:27:57 PM »
I think we are seeing serious far reaching consequences that may be attributed to these glaciers discharging dense silt laden freshwaters that avalanche down the seafloor to the deeps of the amundsun basin and gakkel trench system showing up in the ITP111 transect that has just been retrieved.
There are visible many small and one major upwellings of warm freshwater, and often very warm and saline entrained below or alongside, from far below the maximum depth range. From about the point the buoy crossed the gakkel in april, the halocline stability essentially collapsed with less than 0.5 psu separating surface and the huge wad of heat from ~100-500m depth. Some geothermal heat may have been brought up by this over the trench.
Its a little hard to wrap your head around whats going on in some of these spikes, but realising that 1000m rise in the water column of a parcel of water means 2.5C drop in temp due to expansion helps.
 
The buildup of subtropical Atlantic currents anticlockwise around Greenland, and even reading 33psu and over six degrees at surface as it exits from beneath the CAA ice is disturbing. Eric Rignot expressed surprise in detecting Atlantic water coming in from nares strait to the nth and attacking the base of the humbolt in the Kane basin on his sampling trip last year. He shouldn't have been surprised. This system change has been pretty obviously building for at least three years. People are witholding data unfortunately.
The catastrophic cascade collapse in the near Future of the GIS is not something many want to be heard talking about. 🙄
« Last Edit: July 20, 2020, 08:34:43 PM by OffTheGrid »

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Re: Zachariae Isstrøm / Nioghalvfjerdsfjorden / NE Greenland
« Reply #1037 on: July 29, 2020, 12:47:21 AM »
I noticed the whole area is very blue in Worldview today. This image is not color-enhanced.

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Re: Zachariae Isstrøm / Nioghalvfjerdsfjorden / NE Greenland
« Reply #1038 on: August 04, 2020, 05:30:05 AM »
A longer term view at the ZI calving front (center left), and my pet interest - its old disconnected tongue (center right). Every year it loses some nibbles. When it's gone from the bay, I fear melting and calving activity might be enhanced at the ZI front.
The calving front shows some ongoing losses over the years, except maybe in 2018.
The image dates are Sep 15th 2016, Sep 10th 2017, Aug 12th 2018, Aug 21st 2019, Aug 4th 2020.
Click to animate.

p.s. One can see how the location of melt ponds repeats every year despite glacier advance, following underlying topography.

p.p.s. I have never noticed until today the huge gray lake at the southern end of Lambert Land (top left), though it's been there for a long time. I wonder what happens when it connects with the calving front.
« Last Edit: August 04, 2020, 05:41:12 AM by oren »

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Re: Zachariae Isstrøm / Nioghalvfjerdsfjorden / NE Greenland
« Reply #1039 on: August 04, 2020, 06:06:04 AM »
That glacial milk-filled (I'm sure) lake appears to me to have a surface little different from sea level, so when the glacier retreats to it, little (else) will change.  A tongue with water on two sides may retreat faster, but just maybe.  Just my semi-educated guesses.
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Re: Zachariae Isstrøm / Nioghalvfjerdsfjorden / NE Greenland
« Reply #1040 on: August 04, 2020, 11:25:14 AM »
There is a whole chain of "separate" lakes well connected down to Kap Zachariae and the sea:
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Re: Zachariae Isstrøm / Nioghalvfjerdsfjorden / NE Greenland
« Reply #1041 on: August 04, 2020, 12:14:48 PM »
Thanks. Guess I've been blind all these years.

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Re: Zachariae Isstrøm / Nioghalvfjerdsfjorden / NE Greenland
« Reply #1042 on: August 09, 2020, 07:11:01 PM »
Sea ice in Jokel Bay is breaking up, and the ZI icebergs are being flushed. IIRC this is rather early in the season. This happens every 2-3 years, and IMHO can speed up calving of more icebergs that are barely holding on, due to loss of buttressing.
Espen please correct any errors.

p.s. Pardon the coarse Worldview resolution. Animation ends 3 days ago, only clouds since then. Best to increase page zoom or else it's very hard to see anything.

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Re: Zachariae Isstrøm / Nioghalvfjerdsfjorden / NE Greenland
« Reply #1043 on: August 09, 2020, 08:48:03 PM »
I looked at polarveiw earlier they have an image covering the whole area from 79N south  the sea is on the move and there's some separation from the old tongue. I don't normally comment on the weather but it looks to me like it's been raining all day, can someone confirm or refute?
https://earth.nullschool.net/#2020/08/09/0600Z/wind/surface/level/overlay=precip_3hr/orthographic=-40.88,80.55,1060/loc=-21.667,79.261

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Re: Zachariae Isstrøm / Nioghalvfjerdsfjorden / NE Greenland
« Reply #1044 on: August 11, 2020, 11:09:29 AM »
The clearing of Jokel Bay and the calved icebergs is continuing behind the clouds, courtesy of Sentinel-1. Open water now visible in the innermost bay.
Click to animate.

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Re: Zachariae Isstrøm / Nioghalvfjerdsfjorden / NE Greenland
« Reply #1045 on: August 13, 2020, 12:05:40 AM »
The clearing of Jokel Bay and the calved icebergs is continuing behind the clouds, courtesy of Sentinel-1. Open water now visible in the innermost bay.
Click to animate.
Thanks
That fills in a couple of missing days, especially the tenth. Which seems before the main burst, visible clearly on Worldviews. Not sure how much went through and under the Melange field, or however many hundreds of meters thick it is but the flow over the top suggest it could have passed 1 million tonnes per second at peak.
The whole Melange field moved ,parts over 10km in 5 days up to the 6 August, and extended up the inland  lakes on the sides of the main ice sheet, by the worldviews on the 11th.
Cloudy on 12th unfortunately. Perhaps lots of local humidity.

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Re: Zachariae Isstrøm / Nioghalvfjerdsfjorden / NE Greenland
« Reply #1046 on: August 13, 2020, 12:59:35 AM »
9, 10, 11 Aug closeups.

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Re: Zachariae Isstrøm / Nioghalvfjerdsfjorden / NE Greenland
« Reply #1047 on: August 13, 2020, 01:10:16 AM »
 :( First two are back to front sorry. Full lake and aquifer about to burst on the 10th, the first shot.
Outbursts in action: rubbish resolution worldview.

9, 10, 11 Aug closeups.

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Re: Zachariae Isstrøm / Nioghalvfjerdsfjorden / NE Greenland
« Reply #1048 on: August 13, 2020, 09:17:35 PM »
The best S1 shots from 9th to 12th, dates and times in filenames.
It looks like there were two major outbursts, one on the tenth, one early on the twelfth.
« Last Edit: August 13, 2020, 09:25:14 PM by OffTheGrid »