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Author Topic: Petermann Gletscher / Petermann Fjord / North West Greenland  (Read 307101 times)

blumenkraft

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Re: Petermann Gletscher / Petermann Fjord / North West Greenland
« Reply #700 on: October 22, 2019, 03:42:57 PM »
Wait a second, is it going backward??

Tor Bejnar

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Re: Petermann Gletscher / Petermann Fjord / North West Greenland
« Reply #701 on: October 29, 2019, 03:13:37 PM »
Me and my lineations.  Red circles one. (See thread that started with a poll that asked when a crack would occur in this area, including an enlargement of this lineation from October 2.)  Orange circles a lineation 20 km upstream.  (Petermann Glacier is about 15 km wide in the red circle [okay, oval] area.) Screen print from Polar View image from 2019-10-28.
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blumenkraft

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Re: Petermann Gletscher / Petermann Fjord / North West Greenland
« Reply #702 on: December 03, 2019, 05:46:13 PM »
Finally some info! \o/

Blog: “Back in Petermann Fjord”

https://polar.se/en/news/blog-back-in-petermann-fjord-english/

blumenkraft

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blumenkraft

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Re: Petermann Gletscher / Petermann Fjord / North West Greenland
« Reply #704 on: January 30, 2020, 06:21:21 PM »
Most beautiful satellite glitch <3

nukefix

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Re: Petermann Gletscher / Petermann Fjord / North West Greenland
« Reply #705 on: January 31, 2020, 07:55:52 AM »
Most beautiful satellite glitch <3
Looks like an orthorectification-error ... what is the source of that image?

edit: seems to be PolarView. I would guess that for some reason the geocoding of the image partially failed, as if they used an incorrect DEM, even though they don't use the DEM at all but only ellipsoid geocode  ???
« Last Edit: January 31, 2020, 08:02:24 AM by nukefix »


blumenkraft

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Re: Petermann Gletscher / Petermann Fjord / North West Greenland
« Reply #707 on: February 07, 2020, 06:43:10 PM »
Mean flightpaths are a thing!

I mean, WTFareyoukiddingme??

Tor Bejnar

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Re: Petermann Gletscher / Petermann Fjord / North West Greenland
« Reply #708 on: February 07, 2020, 07:43:26 PM »
From PolarView (Feb 7).  Is this what they call "fuzzy logic"? :D
The crack I'm watching 'so closely' is on the right.  Most of the wavy distraction is on the land beside Petermann Glacier.
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blumenkraft

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Re: Petermann Gletscher / Petermann Fjord / North West Greenland
« Reply #709 on: February 07, 2020, 07:47:39 PM »
A persistent glitch over several different pictures. It's really weird...

Aliens?

sqwazw

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Re: Petermann Gletscher / Petermann Fjord / North West Greenland
« Reply #710 on: February 09, 2020, 10:30:50 AM »
A persistent glitch over several different pictures. It's really weird...

Aliens?
Aliens have better things to do. Mechanical vibration on the sensor? Hard disk humming at EOL?

blumenkraft

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Re: Petermann Gletscher / Petermann Fjord / North West Greenland
« Reply #711 on: February 09, 2020, 10:35:04 AM »
Ok, i can imagine many reasons. But why is it glitching here? And only here for what i can say.

Tor Bejnar

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Re: Petermann Gletscher / Petermann Fjord / North West Greenland
« Reply #712 on: February 09, 2020, 03:00:26 PM »
Despite the "fuzzy logic" in the lower left of this screen print (PolarView Feb. 8) the trans-lateral crack appears to have a (different kind of) fuzzy connection to the SW (left) shore.  Previous images have suggested this feature (e.g., Dec. 6).

Note: I usually post comments about the potential rifting in this area on the Poll thread focused on this.
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Espen

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Re: Petermann Gletscher / Petermann Fjord / North West Greenland
« Reply #713 on: February 19, 2020, 10:38:56 PM »
The situation at Petermann so far in 2020:
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Thomas Barlow

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Re: Petermann Gletscher / Petermann Fjord / North West Greenland
« Reply #714 on: March 14, 2020, 03:51:57 AM »
I'd be surprised if this summer doesn't spell the end for this, as others have been pointing out for a while now.

Sentinel-1 SAR imagery
Acquired: 13-03-2020 11:50:54 UTC
« Last Edit: March 14, 2020, 03:59:15 AM by Thomas Barlow »

Tor Bejnar

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Re: Petermann Gletscher / Petermann Fjord / North West Greenland
« Reply #715 on: May 03, 2020, 07:12:38 AM »
Sentinel-hub Playground image (more or less: pink = ice; blue = melting ...) showing lateral crevasse that hasn't budged this month (more or less -- under right date bar).

What amazes me is the two spots with a hint of blue on the frozen-over pond (under the "-02" of the left image date - about 4 date-bar widths down).  (From reading elsewhere, I know such supraglacial lakes can have a core of liquid water through the winter if deep enough, but that amazes me too.)
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Re: Petermann Gletscher / Petermann Fjord / North West Greenland
« Reply #716 on: May 14, 2020, 03:48:25 AM »
Not sure if this is the best location but just wanted to add as we approach another calving I got bored last year and tracked the last iceberg remnant throughout the years. I believe it is the same P-II-B that was studied at least through 2014 or so. In 2014 is grounded itself off Baffin just south of the settlement of Qikiqtarjuaq and has spent the years since being slowly disintegrated. Last summer it was grounded again and I lost track of it but the first pic is a worldview capture from mid-summer 2019. It floated up the nearby Matak Fjord into Auyuittuq National Park and finally shattered around mid-september. The leftovers spread throughout the area but the largest sliver left is currently frozen in the adjacent coronation fjord (67.24, -64.3). This is probably its final year as a recognizable iceberg as it slowly awaits its doom the coming summer. I am looking forward to see the evolution of the next ice island and where its journey takes it.

oren

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Re: Petermann Gletscher / Petermann Fjord / North West Greenland
« Reply #717 on: May 14, 2020, 04:57:45 AM »
Thank you for the update Errorr, and welcome back after a long period of silence.
It's amazing that a remnant of the ice island is still around.

Espen

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Re: Petermann Gletscher / Petermann Fjord / North West Greenland
« Reply #718 on: June 03, 2020, 05:53:04 PM »
The Corona year 2020 may be the year for the next calving at Petermann Gletscher:
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blumenkraft

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Re: Petermann Gletscher / Petermann Fjord / North West Greenland
« Reply #719 on: June 06, 2020, 01:06:57 PM »
The "return [B8A*2,B03*1,B02*1]" setting at Sentinel playgrond shows a lot of meltponds.

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Re: Petermann Gletscher / Petermann Fjord / North West Greenland
« Reply #720 on: June 10, 2020, 03:45:17 PM »
Peterman Ice Shelf Katabatic wind effects

Ok, I try really hard not to post often as I'm sure that my babblings would be strange and incoherant to most minds, but I could'nt resist sharing this image of one of my favourite glaciers; Peterman Glacier.

As you can see, its a shot of the forward left side of the ice shelf, about 5km in front of the the glacier face. The interesting linear features I am interpreting as melt ponding on the ice shelf between large scale snow dunes formed by katabatic winds funneling down the glacier gorge.

I'm very surpised to see them in the first instance, but more so the scale and extent of the features. I would welcome any further insights that the forum veterans have.
« Last Edit: June 10, 2020, 04:15:56 PM by Cookymonster »


oren

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Re: Petermann Gletscher / Petermann Fjord / North West Greenland
« Reply #722 on: June 10, 2020, 07:37:35 PM »
CM, it is a sad reality of Internet forums that those who are intelligent enough to employ self restraint post much less often than others who are not as self aware.
Be that as it may, I encourage you to post more often, and be aware you are easy to understand and quite coherent.
To your specific point, it seems to me the huge melt pond area is on the sea ice in the fjord, rather than on the ice shelf itself. I note that another section of sea ice adjacent to the ice shelf has extensive (but smaller) melt ponding, right of the center. I have no specific explanation for the interesting phenomenon.

blumenkraft

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Re: Petermann Gletscher / Petermann Fjord / North West Greenland
« Reply #723 on: June 10, 2020, 07:57:57 PM »
Be that as it may, I encourage you to post more often, and be aware you are easy to understand and quite coherent.

+1

Peterman Ice Shelf Katabatic wind effects

I noticed those last year too.

Espen

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Re: Petermann Gletscher / Petermann Fjord / North West Greenland
« Reply #724 on: June 15, 2020, 07:02:50 PM »
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
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Espen

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Re: Petermann Gletscher / Petermann Fjord / North West Greenland
« Reply #725 on: June 24, 2020, 11:14:34 AM »
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!

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oren

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Re: Petermann Gletscher / Petermann Fjord / North West Greenland
« Reply #726 on: June 24, 2020, 11:52:51 AM »
Interesting. It's been a while since the last calving.
BTW do you think it has the potential to plug the Nares or at least disrupt ice export? 200 km2 seems too small for that.

Niall Dollard

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Re: Petermann Gletscher / Petermann Fjord / North West Greenland
« Reply #727 on: June 24, 2020, 12:16:34 PM »
That's about the size of it superimposed on the Kennedy Channel, if it all came out intact !

But I don't suppose it could. But broken up and joined by thick sea ice from the Lincoln it could make a substantial blockade ! 

blumenkraft

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Re: Petermann Gletscher / Petermann Fjord / North West Greenland
« Reply #728 on: June 24, 2020, 12:22:24 PM »
Amazing, Niall! Thanks for that.

If it was sitting there in the channel stuck, could it cool the water behind it down quite significantly?

oren

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Re: Petermann Gletscher / Petermann Fjord / North West Greenland
« Reply #729 on: June 24, 2020, 12:41:46 PM »
Thanks Niall. Thinking on it some more, the deep keel makes it more susceptible to the current, reducing the chances of lingering long, unless it gets stuck on Hans or one of the other islands somehow.

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Re: Petermann Gletscher / Petermann Fjord / North West Greenland
« Reply #730 on: June 24, 2020, 12:52:42 PM »
Worth having a look back to the start of this thread. Espen has plenty of images. The 2012 PII berg/ice island was still knocking around the Kane Basin in August 2013.

https://forum.arctic-sea-ice.net/index.php/topic,53.msg11177.html#msg11177

Here are some images of the July 2012 calving.

https://earthobservatory.nasa.gov/images/78556/more-ice-breaks-off-of-petermann-glacier

Espen

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Re: Petermann Gletscher / Petermann Fjord / North West Greenland
« Reply #731 on: June 28, 2020, 09:47:31 AM »
Petermann Gletscher - June 27 2020 and counting. Calving sequence start .........


Please click on image to animate!
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Espen

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Re: Petermann Gletscher / Petermann Fjord / North West Greenland
« Reply #732 on: July 07, 2020, 10:35:52 AM »
Petermann Gletscher -  July 6 2020 and counting. Calving sequence start T-? .........

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Re: Petermann Gletscher / Petermann Fjord / North West Greenland
« Reply #733 on: July 07, 2020, 02:35:27 PM »
Isn't the implication of the lake drainage that the calving has already happened, just that we can't see it yet...

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Re: Petermann Gletscher / Petermann Fjord / North West Greenland
« Reply #734 on: July 14, 2020, 09:14:07 PM »
The fast ice in the fjord is cracking and also draining fast. This is today vs yesterday.

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Re: Petermann Gletscher / Petermann Fjord / North West Greenland
« Reply #735 on: July 15, 2020, 05:50:50 AM »
Nice eddy there helping to draw that ice out.
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Re: Petermann Gletscher / Petermann Fjord / North West Greenland
« Reply #736 on: July 15, 2020, 07:46:10 AM »
nice catch.

sidd

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Re: Petermann Gletscher / Petermann Fjord / North West Greenland
« Reply #737 on: July 21, 2020, 09:29:32 PM »
Here's a Landsat 8 RGB composite of Petermann Glacier, from July 17th.
https://twitter.com/Icy_Samuel/status/1285656073517531138

I recently joined the twitter thing, where I post more analysis, pics and animations: @Icy_Samuel

Espen

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Re: Petermann Gletscher / Petermann Fjord / North West Greenland
« Reply #738 on: July 22, 2020, 12:26:01 PM »
A revisit to Petermann Gletscher since 2000, including the unnoticed 2008 calving, notice the disappereance of Ice Caps at Washington Land and Daugaard-Jensen Land during the years:

Please click on image to animate!

« Last Edit: July 22, 2020, 09:48:33 PM by Espen »
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Espen

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Re: Petermann Gletscher / Petermann Fjord / North West Greenland
« Reply #739 on: July 26, 2020, 02:33:48 PM »
While we are waiting for the "Big One" at Petermann Gletscher, a similar calving type was seen at Ryder Gletscher in August 2016, notice how small the crack is just days before the actual calving.

Please click on image to animate and enlarge!
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paolo

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Re: Petermann Gletscher / Petermann Fjord / North West Greenland
« Reply #740 on: July 26, 2020, 04:08:53 PM »
Still waiting for your announcement of the "Big One", the last pieces of sea ice are gone and two small pieces have just taken the opportunity to take to the open sea not waiting for the rest ...

click to animate

nukefix

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Re: Petermann Gletscher / Petermann Fjord / North West Greenland
« Reply #741 on: July 26, 2020, 07:00:22 PM »
Sea-ice buttressing gone...a speedup of the glacier is probably taking place now.

Tor Bejnar

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Re: Petermann Gletscher / Petermann Fjord / North West Greenland
« Reply #742 on: July 28, 2020, 06:49:56 PM »
Nearly all of the rest of the ice just off that side glacier has mobilized. (Sentinelhub Playground image's Gamma pushed to 2.5 for more contrast)
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Espen

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Re: Petermann Gletscher / Petermann Fjord / North West Greenland
« Reply #743 on: July 28, 2020, 10:04:27 PM »
Sea-ice buttressing gone...a speedup of the glacier is probably taking place now.
I dont believe the sea ice in front of Petermann Gletscher is any problem to this Giant, but that said the sea ice normally goes away when in Petermann calves in Mid July and August.
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Tor Bejnar

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Re: Petermann Gletscher / Petermann Fjord / North West Greenland
« Reply #744 on: July 30, 2020, 07:52:06 PM »
Recent 'calving' (or releasing of ice previously calved but all frozen together until now) area is all but cleared out, as of yesterday's Sentinelhub Playground image.

Now, when will the blue circled area crack?  (I've been holding my breath for a year!  :-\)
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blumenkraft

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Re: Petermann Gletscher / Petermann Fjord / North West Greenland
« Reply #745 on: July 30, 2020, 08:08:09 PM »
I've been holding my breath for a year!  :-\

Tell me about it. Every day...

blumenkraft

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Re: Petermann Gletscher / Petermann Fjord / North West Greenland
« Reply #746 on: July 31, 2020, 07:30:06 PM »

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Re: Petermann Gletscher / Petermann Fjord / North West Greenland
« Reply #747 on: August 18, 2020, 10:36:09 AM »
Crack growth over the last month
I recently joined the twitter thing, where I post more analysis, pics and animations: @Icy_Samuel

blumenkraft

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Re: Petermann Gletscher / Petermann Fjord / North West Greenland
« Reply #748 on: August 18, 2020, 10:55:53 AM »
Hmm, IDK, Samuel. Is it sea ice thawing or crack opening what we see in your GIF?

In the zoomed in direct comparison i don't see the crack growing really.

oren

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Re: Petermann Gletscher / Petermann Fjord / North West Greenland
« Reply #749 on: August 18, 2020, 10:57:35 AM »
Crack growth over the last month
I love how the shadows on the left side enable mapping the cliffs.