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Messages - Espen

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1
And here is the long awaited calving at Spaltegletscher:

Click on image to animate!

3
As reported earlier by AH Jakobshavn did a late June calving:

Please click on image to animate!

4
Petermann Gletscher - June 27 2020 and counting. Calving sequence start .........


Please click on image to animate!

5
Petermann Gletscher: The crack at Petermann Gletscher is expanding, the next few weeks will be interesting, will the potential +/- 200 km2 calf take off this summer? The crack is also only 1,5 km from the portside crack so only 7,5 % from being a full crack across the glacier.

Please click to animate!

https://twitter.com/Ecoverycom

6
Jakobshavn Isbræ
Very active this season but still far away from where it was August 16 2015.

https://twitter.com/Ecoverycom

7
The crack at Petermann Gletscher is progressing, and we could well see a +/- 200 km2 calving later in the season (July/August).

https://twitter.com/Ecoverycom

8
The Corona year 2020 may be the year for the next calving at Petermann Gletscher:

9
Hi Stephan,

The southern branch is unusually deep this time of the season, compared to all years I have records of.

10
A busy month is coming to an end:

11
Jakobshavn is pretty active this spring?

12
quite a calving at the Sverdup Gletscher (from Sentinel playground 2nd of April 2020):

Correction: That is Nansen Gletscher, Sverdrup Gletscher is the next glacier to the right.

13
The situation at Petermann so far in 2020:

14
Bathymetry constrains ocean heat supply to Greenland’s largest glacier tongue:


https://www.nature.com/articles/s41561-019-0529-x.epdf

15
A very heavy calving or almost an explosion happened today at Nansen Gletscher, sorry about the lousy resolution:

16
Although I expected a real calving in 2019 which obvisously did not happen, the cracks at the port side of the glacier are still extending further towards each others.
The cracks are shown with a red 1. and 2.   

17
Helheim Gletscher not far away from record satellite retreat (August 17 2017), some would say overall record but not depthwise?

18
A day later:

19
Another one:

20
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.

21
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 :)

22
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!!

23
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.

24
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!

25
And a few more:

26
More images:

27
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 :

28
At the risk of looking a gift horse in the mouth, where can we find links to higher resolution versions?

WYSIWYG

29
Kjer Gletscher - No text needed:

30
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: 

31
Wow. Just wow.
Seeing the familiar calving front up close and personal gives meaningful insight to the scale of the thing.

Yes it is a bit different to LEGO?

34
More images:

35
In cooperation with the Operation Ice Bridge Team and especially Sea Ice Scientist Linette Boisvert NASA who sent me many images and a few videos from their trip across Zachariae Isstrøm on September 5 2019, the delay in the publishing is due to the poor internet band width at Thule Airbase.
We start this round of images from the top of Zachariae Isstrøm including the giant meltponds then passing the calving front across the Zach Bay and at the end we reach the former glacier tongue of Zachariae Isttrøm, now a death piece of glacier ice, enjoy and again thanks to Linette:

36
Arctic sea ice / Re: The 2019 melting season
« on: September 13, 2019, 12:51:24 AM »

This is my thought too; that there isn't enough insolation to melt the ice N of 80°N with the current FDD thickness increase, even in a sunny year.


At the end of July, I said as much, while the melt season thread was in full rampant flow.

From a discussion point of view, this seemed to be too controversial at the time and the discussion was taken off to another thread and died a death.

It is a pity that the melting season thread, at certain times of the year, can be a discouraging place to raise a different point of view.

 

The subject of sea ice extent/area/volume is now more related to gaming, unfortunately?

37
Greenland and Arctic Circle / Re: Jøkelbugt / North East Greenland
« on: September 11, 2019, 07:16:30 PM »
The last remaining offshore fast ice in the Northern Hemisphere, I know about, nicknamed "The Untouchable" did survive longer than I anticipated, but I am convinced it will disappear for the first time this season since 2003 , the reason for why it is stucked there is because of the very shallow water in that area, underneath there is a very extensive sandbank called Belgica Banke, and frozen together with many (+70) old grounded glacier icebergs the sea ice becomes very strong and almost impossible to break up.
Why is this phenomena so interesting? Remember not far from here we have the large Zachariae Isstrøm, and my studies show that the breakup of all sea ice in front of and inside Jøkelbugt in 2001 to  2003 started the massive break up and retreat of Zachariae Isstrøm in the years thereafter, but anyway it will be interesting to see if "The untouchable" will rebuild its strength over the winter, it will depend on the amount of glacier icebergs available.

38
Greenland and Arctic Circle / Re: What's new in Greenland?
« on: September 09, 2019, 12:51:51 PM »
Danish newspaper Politiken today had a frontpage story:

https://politiken.dk/klima/art7361623/Danmark-bremser-vigtig-klimaforskning-ved-Grønland

Apparently, the Danish Ministry of Foreign Affairs has been very reluctant to allow a Swiss-led expedition to circumnavigate Greenland this year.

One of the sticky points seems to be that the 45 researchers would need assistance from two Russian ice-breakers to get around.

Climate researchers are optimistic that the cruise will take place next year.

There could be other reasons too, the trip around Greenland via Nares Strædet is probably the only trip left that was never done, and I know from rumors that a private arrangement was underway for letting some very well to do people getting the honours of being the first to do so.

39
A very impressive image from Petermann taken by the the NASA Icebridge Team September 4 2019:

40
Here is actually a very up to date image of the tongue, taken yesterday by the Icebridge Team:

41
Has there been any deterioration of the portion that has separated from the glacier?

Here is animation showing the deteriotion from 2009 to 2019:

42
Greenland and Arctic Circle / Re: Jøkelbugt / North East Greenland
« on: September 05, 2019, 05:49:42 PM »
It is called sea ice
Espen, is there a name for landfast ice younger than that?

43
Greenland and Arctic Circle / Re: Jøkelbugt / North East Greenland
« on: September 05, 2019, 12:10:47 PM »
This is something that doesn't happen often, but within hours from now the real fast ice in Jøkelbugt will be gone: Fast ice is becomming very rare in and around Greenland, the only fast ice left, to speak about is in the mouth of the Independence Fjord system.

Fast ice is sea ice that is more than one season old!

44
I may add that the year 2002 and is very similar to 2019, since both the Independence Fjord system  (including Danmark Fjord and Hagen Fjord) and the Jøkelbugt area is covered with very little sea ice as in 2002 see below:

45
Has there been any deterioration of the portion that has separated from the glacier?

Yes but relatively little, but some parts in the north, east and south.

That's good. Once this ice shelf disappears and this area becomes seasonal ice, would this have an effect on the behavior of the glacier and the ice that calves from it?

No I dont think that do will result in any major differences, the big thing that happened to Zachariae Isstrøm was the paradigm shift in the sea ice in front of the islands in Jøkelbugt which took place in the beginning of this century 2001 and 2002 especially, in 2002 almost all or 99% of the sea ice disappeared for the first time in satelite history and the cork in front of Zachariae Isstrøm, a massive amount of old glacier ice could leave the area and set the speed of calving followed by a massive retreat that we can witness today. The image below is from the Zachariae Isstrøm paradigme shift year 2002:

46
Has there been any deterioration of the portion that has separated from the glacier?

Yes but relatively little, but some parts in the north, east and south.

47
Here is an updated retreat situation at Zachariae Isstrøm:

48
Arctic sea ice / Re: 2019 sea ice area and extent data
« on: September 04, 2019, 07:47:56 AM »
A pixel color comparison could be very interesting?

49
Arctic sea ice / Re: 2019 sea ice area and extent data
« on: September 04, 2019, 07:42:20 AM »
Interesting comparison:

50
Made a photo collage out of a Sentinel 2 image and a photo produced by Ulf Hedman onboard the Oden, you can see the 3 small glaciers originating from Permin Land on Ryders Port side (Sentinel 2) and in the background of photo from Oden:

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