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Messages - IceConcerned

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1
Antarctica / Re: Pine Island Glacier (PIG) Calving and Discussion
« on: August 11, 2020, 12:16:35 PM »
Paolo
I think you underestimate the crack you labeled ""C*. On the contrary I think it is the portend of a very serious future calving (going from the current diagonal to a new perpendicular front as you predicted some weeks ago)

2
Antarctica / Re: Pine Island Glacier (PIG) Calving and Discussion
« on: July 30, 2020, 05:19:58 PM »
Well, what is sure is that the cork has suffered another significant break
IMHO it will not hold much longer

3
Arctic sea ice / Re: The 2020 melting season
« on: July 22, 2020, 11:45:39 AM »
Is it my imagination or is it a signal that 3yr ice is disappearing this year?

4
Antarctica / Re: Pine Island Glacier (PIG) Calving and Discussion
« on: May 25, 2020, 10:39:42 AM »
The quality is very poor, but I have the impression that the blocs from the SIS are getting loose.
Not sure due to the image quality, but also a feeling that the Crescent is moving, along with more melange.

5
Permafrost / Re: Graying/Browning of Snowcover Svalbard
« on: April 28, 2020, 07:19:50 AM »
The extension to ice is likely linked to strong winds : look at the clouds and floating ice, they tend to form shapes parallel to the brown extension
As for the original cause, it is difficult to say but rocks or sand and dust being blown off is a possibility. So avalanche, or maybe just aerial erosion?

6
Antarctica / Re: Thwaites Glacier Discussion
« on: April 20, 2020, 01:07:15 PM »
It was apparently a compression issue, yellow being too pale and diffused through the compression. I corrected to purple, I hope it is clearer now.

7
Antarctica / Re: Thwaites Glacier Discussion
« on: April 20, 2020, 11:47:51 AM »
It has been already mentioned before that the ice tongue has crumbled little by little. I will not come back to that point, the slow-motion disintegration has just gone on.
But on top of that, the tongue is detaching itself from the main body ; one of the main zones of separation is underlined in yellowish purple.
The backpressure on the flow from the mainland is thus gone, and we can see quite worrysome (in my opinion) new cracks appear. The most significant is underlined in green, with dots to show its likely progress. But others parallel to it are also becoming more apparent.
Combined with the existence of the underice cavities mentioned in several publications, we may approaching a critical point for this portion of the glacier.


PS : I am slightly color blind, please accept my apologies if the color names are not fully adequate... :-[

8
Antarctica / Re: Thwaites Glacier Discussion
« on: April 11, 2020, 10:41:39 AM »
Highly instructive, we can see many more things on animations like this
It appears that the small movement northwards of the western part has already opened an evacuation channel for the accumulated ice

9
Arctic sea ice / Re: The 2020 melting season
« on: April 07, 2020, 06:45:31 PM »
But even if we get this extra cooling only at mid latitude that extra heat so generated will have to go somewhere, I would expect some movement northwards that would bring this melting force to the Arctic

10
Antarctica / Re: PIG has calved
« on: March 30, 2020, 08:24:20 PM »
Very much welcome Paolo, and thanks for the animation I concur with your interpretation.
I take this opportunity to thank you for your very didactic and (in my opinion) mechanically very accurate posts, it is a real delight

Coming back to the NIS I think that the crevassed chunk just south of the last calving is very fragilised and the cracks there have widened since your last post on the matter

11
Antarctica / Re: PIG has calved
« on: March 30, 2020, 04:35:02 PM »
In the mean time, a new calving occurred on the NIS

12
Antarctica / Re: What's new in Antarctica ?
« on: February 28, 2020, 10:43:44 PM »
I do not know where to post this, but Wilkins ice sheet is showing signs of getting a drumming short term and there is on top of that that eastern crack inland that could expand quite quickly in my mind....

13
Antarctica / Re: Halley base shut down and new crack in Brunt shelf
« on: February 28, 2020, 10:41:22 PM »
When looking at the last Sentinel SAR image I tend to concur : the iceberg is detaching
Besides, a "parllel" to halloeen crack is developing
Both are underlined in the attached image

14
Science / Re: Water availability
« on: January 05, 2020, 01:10:04 PM »
Jules Verne already thought about it : "La mer intérieure"

15
Antarctica / Re: PIG has calved
« on: December 03, 2019, 04:18:25 PM »
On top of Baking's remarks, we can note on the eastern side many small cracks (inside the "square"
Besides, the main (putative) iceberg has fractured a lot, its lifetime after the calving might be quite reduced as a consequence
On the crack on the SW tributary is far more apparent than on previous images : is it an effect of the post treatment on an aggravation ?

16
Antarctica / Re: Rift in Filchner-Ronne Ice Shelf
« on: October 11, 2019, 10:32:10 AM »
The cracks appear to extend parallel to the sea front :
link with the side completed for some time already
tentative small cracks linking the two big EW cracks - maybe visual artifacts ?
extension of the cracks link to the NS opening at the middle of the shelf
doubling of the length of the southern crack

All evolutions I spotted are underlined in the image

17
Antarctica / Re: PIG has calved
« on: October 08, 2019, 09:12:24 AM »
A minor calving at the junction between PIG and SW tributary.
Tha cracks in the SW Tributary seem to have widened at htat point too

18
Antarctica / Re: The Amery Ice Shelf Thread
« on: September 26, 2019, 11:53:44 AM »
The speed of this calving is properly astonishing : I was having  alook from time to ime to the shelf, and the big cracks showed no really active propagation
For example see Sentinel image (from Polarview) on Sept.23 :
https://www.polarview.aq/images/105_S1jpgfull/S1A_IW_GRDH_1SSH_20190923T154447_5F29_S_1.final.jpg

19
Arctic sea ice / Re: The 2019 melting season
« on: September 02, 2019, 01:48:01 PM »
That cyclone entering from Svalbard, giving then a round through FJL to pole to Fram will be interesting to watch. Strong winds over fragmented ice all along....

20
Arctic sea ice / Re: The 2019 melting season
« on: August 27, 2019, 02:59:23 PM »
If these conditions remain, is it wrong to assume that, given an early refreeze, then sea heat will get trapped, and result in poor quality ice all along, which we will pay in the 2020 melt season ?

21
Most significant for me is the opening of the western cracks, down the cliff
This is a true change in behaviour compared with previous observations

22
Antarctica / Re: Majestic Antarctic Images
« on: August 10, 2019, 09:56:20 PM »
Awesome!
It looks like an Egyptian temple

23
Antarctica / Re: PIG has calved
« on: June 27, 2019, 01:11:25 PM »
I just checked GFS, is it normal in this season (winter solstice in SH) to have such warm blobs near the continent ? (here views for today and Monday)
It will certainly do no good to the glaciers there

24
Antarctica / Re: PIG has calved
« on: June 19, 2019, 04:18:25 PM »
I also think this is a ad place to lose ice : the back pressure of this block helped maintain in place the cracked ice just south of it. On Wipneus animation we can even see the two immediate next crack increase markedly in size.
Besides, losing the W anchor should facilitate the movement of the big calving block, thus creating a kind of rotation that will amplify stresses at the last remaining non cracked ice on the eastern side.

25
Antarctica / Re: PIG has calved
« on: June 13, 2019, 11:07:17 AM »
On the Western side, I have the impression that the crack have a path all the way to the open waters

26
The Reds are coming !  8)

27
Antarctica / Re: Antarctic Icebergs
« on: June 10, 2019, 03:10:07 PM »
As seen on Polarview SAR imagery : https://www.polarview.aq/images/105_S1jpgfull/S1A_IW_GRDH_1SSH_20190608T080144_5C66_S_1.final.jpg,
it appears the rotation of the iceberg is going on.

I am wondering besides, with such a big bloc at the outlet of the gulf, will there be no effect (through tides, diverged currents...) on the remains of Larsen B ? I have the impression that the cracks around the islets in particular are growing wider and longer ? (maybe just an illusion). To be noted, there was a minor calving at the norther junction with the meninsula a few days ago (with the resulting iceberg still visible in the gulf, oriented more or less N-S)

28
Antarctica / Re: PIG has calved
« on: May 10, 2019, 04:05:53 PM »
And another small calving, at the northern tip of the SW tributary this time.
Much movement currently....

29
Antarctica / Re: PIG has calved
« on: April 11, 2019, 12:06:29 PM »
Good image from Worldview today
New cracks on the eastern side (circled)
And I have the impression that the big central cracked have lengthened (see the white lines). Or is it just a visual artifact ?

30
Arctic sea ice / Re: The 2019 melting season
« on: April 05, 2019, 11:52:08 AM »
When looking at Aluminium animation, I am marked by the appearnce of big, long cracks within the ice. The wind force and derive must be very strong :
This time they appear mainly off the north Siberian coast, but there is a small one in Beaufirt too. And I remember seeing them on other previous animation too : do I have bad memories, or is it indeed a first ?

31
Antarctica / Re: PIG has calved
« on: February 22, 2019, 05:57:08 PM »
Same analysis on the Western cracks. The new thin one is approx. 1km long, and is doubled by the prolongation of the longer one a little further downstream
On the eastern side, the crack appears to have significantly widened and lengthened (2km?)

32
Antarctica / Re: Rift in Larsen C
« on: February 04, 2019, 02:59:41 PM »
Apparently new cracks appeared recently on the shelf, a big chunk seems ready to get loose.

33
Antarctica / Re: PIG has calved
« on: January 09, 2019, 05:11:53 PM »
Further movement : dislocation of the main iceberg going on the east side, and rotation of the whole, opening the front to more open seas.

34
Antarctica / Re: PIG has calved
« on: January 09, 2019, 04:51:17 PM »
Indeed, there two new cracks on the main flow's edge. The one further inland could point to the crack currently appearing at the middle of the flow.

35
practical translation on the Ronne Ice Shelf ?
A new crack appeared recently, which connects two legacy crevasses.

36
Antarctica / Re: PIG has calved
« on: January 08, 2019, 11:48:23 AM »
Many changes in that area in the past few days.
Here are 3 successive screen shots from Sentinel :
* loss of the iceberg on the east side that were in advance to the main big new iceberg
* on the west side, tremendous outbound movement of the icebergs floating in front of the SW tributary, with additional calving
* movement of the main iceberg towards the exterior

37
Antarctica / Re: PIG has calved
« on: January 02, 2019, 12:11:30 PM »
Another calving in preparation ?
A big central crack appears to be opening, quite visible on this sharp image :
https://www.polarview.aq/images/105_S1jpgfull/S1B_IW_GRDH_1SSH_20181230T043510_02A2_S_1.final.jpg

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