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Messages - paolo

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1
Antarctica / Re: Thwaites Glacier Discussion
« on: September 15, 2020, 06:50:56 PM »
Damage accelerates ice shelf instability and mass loss in Amundsen Sea Embayment
Stef Lhermitte, Sainan Sun, Christopher Shuman, Bert Wouters, Frank Pattyn, Jan Wuite, Etienne Berthier, and Thomas Nagler
https://doi.org/10.1073/pnas.1912890117

Abstract
Pine Island Glacier and Thwaites Glacier in the Amundsen Sea Embayment are among the fastest changing outlet glaciers in West Antarctica with large consequences for global sea level. Yet, assessing how much and how fast both glaciers will weaken if these changes continue remains a major uncertainty as many of the processes that control their ice shelf weakening and grounding line retreat are not well understood. Here, we combine multisource satellite imagery with modeling to uncover the rapid development of damage areas in the shear zones of Pine Island and Thwaites ice shelves. These damage areas consist of highly crevassed areas and open fractures and are first signs that the shear zones of both ice shelves have structurally weakened over the past decade. Idealized model results reveal moreover that the damage initiates a feedback process where initial ice shelf weakening triggers the development of damage in their shear zones, which results in further speedup, shearing, and weakening, hence promoting additional damage development. This damage feedback potentially preconditions these ice shelves for disintegration and enhances grounding line retreat. The results of this study suggest that damage feedback processes are key to future ice shelf stability, grounding line retreat, and sea level contributions from Antarctica. Moreover, they underline the need for incorporating these feedback processes, which are currently not accounted for in most ice sheet models, to improve sea level rise projections.

https://www.pnas.org/content/early/2020/09/08/1912890117

2
Greenland and Arctic Circle / Re: Greenland 2020 Melting Season
« on: July 30, 2020, 11:05:04 PM »
This is the upper part of the glacier,
but where's the accumulation zone ? ! ? ! ?

 :'(  :'(

Click to zoom in

It looks even worse today, if that's possible.  It almost looks as if something started the 'defrost' cycle in their freezer and left the door open

3
Arctic sea ice / Re: 2020 Sea ice area and extent data
« on: July 25, 2020, 10:18:05 AM »
Can people please just wait for JCG and Gerontocrat to do their things. It is always funny watching people try to jockey for the honorable position of daily data updater.

As long as users post data ir's ok. Maybe not always useful but no harm. Thanks to all who make the effort.



JAXA Extent -Comparisons with other years

With Juan having a bit of a rest (I hope - he certainly deserves one**) while others take up the slack, I attach my not-as-good-as-Juan's table of variations of Jaxa extent c.f. previous years from 2000.

I also attach another not-as-good-as-Juan's table, this one showing extent on this day c.f. previous years MINIMA from 2000. As extent diminishes 2020 will slide down the table.
___________________________________________
** Juan can't go to bed until the JAXA data arrives, and sometimes it doesn't..
Me, I can yawn, scratch my arse, get up, have a coffee or 3 and only then wake my laptop up.

Thank you all for your comments. The true is that it is hard to be the one that has the job to post 10 or 15 minutes after ADS makes public their data. Sometimes I want to go to bed earlier and sometimes I am doing other stuff and I have to leave it, just because it is the time to post. So, sometimes I just want to skip the post.

Yesterday I was watching Netflix with my wife and I have to stop watching, to make the post 15 minutes later than usual. In a way, it was a relief to saw the posts of Frivolousz21 and MrGreeny (*). I decided to return to watch TV. I think there is not harm if I don't post every single day.

So, thank you, Frivolousz21 and MrGreeny.

I understand the excitement that we have now, with all the records that are being broken. I share this excitement, so, as it is said on boxing, I am not throwing the towel. I will look to continue posting.

If I haven't made the post in 15 minutes after the JAXA data has been released, please feel free to make the post.
 
________________________
(*) P.S. A great relief that there was not a century drop...  :)



I know how stressful it can be.

Espen

4
Arctic sea ice / Re: What's new in the Arctic ?
« on: June 29, 2020, 03:16:24 AM »
Russian Mining Giant Admits Waste 'Violations' at Arctic Plant
https://phys.org/news/2020-06-russian-giant-violations-arctic.html

A Russian mining giant behind an enormous Arctic fuel spill last month said Sunday it had suspended workers at a metals plant who were responsible for pumping wastewater into nearby tundra.



Norilsk Nickel cited a "flagrant violation of operating rules" in a statement announcing it had suspended employees responsible for dumping wastewater from a dangerously full reservoir into a wildlife area.

The incident occurred at the Talnakh enrichment plant near the Arctic city of Norilsk, the company said, one month after the unprecedented fuel leak sparked a state of emergency declared by President Vladimir Putin.

More than 21,000 tonnes of diesel leaked from a fuel storage tank at one of the company's subsidiary plants near Norilsk. The fuel seeped into the soil and dyed nearby waterways bright red.

A source told Interfax news agency Sunday that in the most recent case, around 6,000 cubic meters of liquid used to process minerals at the facility had been dumped and that the discharge had lasted "several hours".

It was impossible to determine how far the wastewater had dispersed, the source said.



Independent newspaper Novaya Gazeta published videos from the scene showing large metal pipes carrying wastewater from the reservoir and dumping foaming liquid into nearby trees.

The journalists claimed the factory deliberately funnelled the wastewater into wildlife areas and hastily removed their pipes when investigators and emergency services arrived on the scene.

Heavy machinery used to clear the pipes crushed a car delivering officials to the scene, Novaya Gazeta reported.



Interfax said no one was injured in the incident which was also being probed

5
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.

6
Antarctica / Re: PIG has calved
« on: March 16, 2020, 05:29:13 PM »
Here you go, Paolo. :)

https://rammb-slider.cira.colostate.edu/?sat=jpss&z=4&im=6&ts=1&st=0&et=0&speed=90&motion=loop&map=0&lat=0&opacity%5B0%5D=1&hidden%5B0%5D=0&pause=20200314095515&slider=-1&hide_controls=0&mouse_draw=0&follow_feature=0&follow_hide=0&s=rammb-slider&sec=southern_hemisphere&p%5B0%5D=day_night_band&x=20311&y=16566.4501953125

The link is pre-selected for the last 6 images. You can go up to 60 images, which takes a lot of broadband data. You can even expand the time frame by setting bigger intervals than 51 minutes or use the archived imagery feature.

The pre-selected band is Day&Night, but be sure to check out the high-resolution I-Bands too (they don't deliver 51 minutes intervals though).

7
Antarctica / Crosson and Dotson Ice Shelves Discussion
« on: February 13, 2020, 07:18:19 PM »
PIIS has pulled all attention in the last weeks, but a few 100 km west another ice shelf had a major calving event.
Between Feb 1 and Feb 11 a part of the Dotson Ice Shelf lost a 25*3 km piece of ice. The days in-between were too cloudy for an evaluation in EOSDIS, so a more exact dating is not possible.

See attached image.

8
Antarctica / Re: PIG has calved
« on: February 09, 2020, 02:29:17 PM »
Well, the cork rotated quite a lot until the recent SAR was shot. And if i had to bet i would say it is still rotating as we speak.

I took the lates (clear) Sentinel 2 and overlayed it with today's Sentinel 1 shot. Click to play.

9
Antarctica / Re: PIG has calved
« on: February 07, 2020, 06:55:00 PM »
The moment we rename the threat, it will calve. It's waiting for it. It's a trap!

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