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Author Topic: Petermann Gletscher / Petermann Fjord / North West Greenland  (Read 213736 times)

Darvince

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Re: Petermann Gletscher / Petermann Fjord / North West Greenland
« Reply #600 on: April 27, 2019, 12:49:41 AM »
I see it, but based on the shape and scale of the other cracks and the bends in them, I don't believe it is anything other than just noise at this point.

oren

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Re: Petermann Gletscher / Petermann Fjord / North West Greenland
« Reply #601 on: April 27, 2019, 01:14:14 AM »
I can see it, but only an animation (corrected for glacier movement) can "prove" if it's a crack and if it's new.

Espen

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Re: Petermann Gletscher / Petermann Fjord / North West Greenland
« Reply #602 on: April 27, 2019, 10:45:33 PM »
I've been 'seeing things' for a long time (and sometimes conflicting with 'each other'), but maybe today you'll see 'it' in this GIF made from yesterday's PolarView.  I see a trace of something (a crack?) the yellow line approximately follows .  [Click to play]   (Edit: approx. location of GIF in outline.  Petermann Fjord is 15 km wide.)

(I sure appreciate Thomas's GIFs too.)

At this point I belive it is only a UIO?
Have a ice day!

Tor Bejnar

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Re: Petermann Gletscher / Petermann Fjord / North West Greenland
« Reply #603 on: April 28, 2019, 12:49:02 AM »
an Unidentified Identified Object?
:)
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Espen

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Re: Petermann Gletscher / Petermann Fjord / North West Greenland
« Reply #604 on: April 28, 2019, 01:01:07 AM »
No an Undentified Ice Object.
Have a ice day!

Tor Bejnar

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Re: Petermann Gletscher / Petermann Fjord / North West Greenland
« Reply #605 on: April 29, 2019, 09:03:00 PM »
Further to what Thomas posted above concerning a crevasse on the NW side of the glacier, the mid-glacier crevasse has also widened over the course of a year.  Images are from Sentinel-hub Playground (April 2018 and April 2019).  The date bars are 150 meters wide and about 38 meters tall.  The location of the crevasse is near the bottom of the image in this post.
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Tor Bejnar

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Re: Petermann Gletscher / Petermann Fjord / North West Greenland
« Reply #606 on: May 14, 2019, 03:19:24 PM »
Different from the post above, these two SentinelHub Playground images are 28 days apart showing Petermann Glacier is moving about 3 meters per day (at this location).  The orange lines are in the dip of the mid-glacier stream valley on the April 14 and May 12 images.
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Tor Bejnar

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Re: Petermann Gletscher / Petermann Fjord / North West Greenland
« Reply #607 on: May 30, 2019, 06:54:58 PM »
Melt ponds on Petermann, per May 29 Sentinel-hub Playground image.

Edit: GIF made with ezgif.com [curious, I had to open the GIF to run it.] showing change between May 22 and 29.  I moved one image to mostly remove the effect of the glacier tongue's movement (see change in lower right corner scale).  Lots of change in 7 days.
« Last Edit: May 30, 2019, 07:35:06 PM by Tor Bejnar »
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Stephan

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Re: Petermann Gletscher / Petermann Fjord / North West Greenland
« Reply #608 on: May 30, 2019, 07:18:33 PM »
Question to the experts: Is this usual for this time of the year or is it (much too) early to happen?

Tor Bejnar

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Re: Petermann Gletscher / Petermann Fjord / North West Greenland
« Reply #609 on: May 30, 2019, 07:50:36 PM »
This part of Petermann Glacier has earlier melt ponds in 2019 than in 2016, '17 or '18.  GIF made from images "dated" May 30 from these four years.  (Date of actual Sentinel-hub Playground image may be earlier, as the 2019 image is actually May 29.  I note the 2016 image has a 'different' shadow.)  You certainly can see the glacier tongue moving year by year!
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b_lumenkraft

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Re: Petermann Gletscher / Petermann Fjord / North West Greenland
« Reply #610 on: May 30, 2019, 07:57:27 PM »
Beautifully aligned shadows in '18 and '19.  8)

Thomas Barlow

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Re: Petermann Gletscher / Petermann Fjord / North West Greenland
« Reply #611 on: June 01, 2019, 11:26:56 PM »
Following on what Tor showed.
Meltponds and fissures: June 1 2018 (left) 2019 (right)
Zoom in for meltponds for 2019.
Also, compare relative distance between two fissures June 1 2018 (red arrow) and 2019 (blue arrow).
(these are the main fissures in the middle of Petermann that have been discussed many times.)
« Last Edit: June 03, 2019, 01:10:40 AM by Thomas Barlow »

Thomas Barlow

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Re: Petermann Gletscher / Petermann Fjord / North West Greenland
« Reply #612 on: June 05, 2019, 02:54:07 PM »
A lot of meltponds - June 5.
Click and zoom to view meltponds.
« Last Edit: June 05, 2019, 03:04:27 PM by Thomas Barlow »

Thomas Barlow

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Re: Petermann Gletscher / Petermann Fjord / North West Greenland
« Reply #613 on: June 05, 2019, 02:56:42 PM »
These fissures look like they are ajoining.
Click to zoom in.

Tor Bejnar

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Re: Petermann Gletscher / Petermann Fjord / North West Greenland
« Reply #614 on: June 05, 2019, 03:59:24 PM »
Uniquorn's and Espen's posts in January fairly show the connection between the crevasses on the NE side of the Petermann Glacier tongue and the mid-glacier lateral crevasse.  Nice to see it with a different satellite.
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Thomas Barlow

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Re: Petermann Gletscher / Petermann Fjord / North West Greenland
« Reply #615 on: June 06, 2019, 02:33:31 AM »
I knew I'd seen something like that somewhere, looked for it, couldn't find them. Thanks for those. The radar images showed it was there, and now it is visible on the surface to the naked eye, makes it tangible. I wonder if we'll see it more visible this summer.
« Last Edit: June 06, 2019, 02:45:12 PM by Thomas Barlow »

b_lumenkraft

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Re: Petermann Gletscher / Petermann Fjord / North West Greenland
« Reply #616 on: June 07, 2019, 12:02:43 PM »
What a difference a day makes ... 24 little hours ...

Thomas Barlow

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Re: Petermann Gletscher / Petermann Fjord / North West Greenland
« Reply #617 on: June 11, 2019, 03:42:06 AM »
A lot of melt ponds.
Fissure extension getting more visible.

Csnavywx

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Re: Petermann Gletscher / Petermann Fjord / North West Greenland
« Reply #618 on: June 11, 2019, 07:02:40 PM »
Upcoming heatwave should cause those ponds to proliferate even more, putting additional hydro pressure on crevasses.

longwalks1

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Re: Petermann Gletscher / Petermann Fjord / North West Greenland
« Reply #619 on: June 11, 2019, 08:38:09 PM »
in re 617

My computer wallpaper is a Sentinel shot from June 18, 2016 is almost an an exact copy of the #617.  I might go back and add it to this post as a reference, but work beckons. 

Thomas Barlow

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Re: Petermann Gletscher / Petermann Fjord / North West Greenland
« Reply #620 on: June 11, 2019, 09:49:38 PM »
Maybe one big difference.
(wait...2)  :)

June 18 2016:
« Last Edit: June 12, 2019, 12:00:58 AM by Thomas Barlow »

Thomas Barlow

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Re: Petermann Gletscher / Petermann Fjord / North West Greenland
« Reply #621 on: June 14, 2019, 10:07:36 PM »
Comparing meltponds June 15 2016.

Thomas Barlow

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Re: Petermann Gletscher / Petermann Fjord / North West Greenland
« Reply #622 on: June 14, 2019, 10:08:10 PM »
Comparing meltponds June 15 2017.

Thomas Barlow

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Re: Petermann Gletscher / Petermann Fjord / North West Greenland
« Reply #623 on: June 14, 2019, 10:08:37 PM »
Comparing meltponds June 15 2018.

Thomas Barlow

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Re: Petermann Gletscher / Petermann Fjord / North West Greenland
« Reply #624 on: June 14, 2019, 10:12:06 PM »
Comparing meltponds June 14 2019.

Thomas Barlow

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Re: Petermann Gletscher / Petermann Fjord / North West Greenland
« Reply #625 on: Today at 04:16:16 AM »
Ajoined.

Thomas Barlow

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Re: Petermann Gletscher / Petermann Fjord / North West Greenland
« Reply #626 on: Today at 04:17:17 AM »
Ajoined.

adjoin (v.)
c. 1300, "unite (something to something else), ally" (a sense now obsolete); late 14c. as "be contiguous with, be adjacent to," from Old French ajoin- stem of ajoindre "join together, unite," from Latin adiungere "fasten on, harness, join to," from ad "to" (see ad-) + iungere "to bind together," from a nasalized form of PIE root *yeug- "to join." Meaning "be contiguous with, be in contact with" is from late 14c. Thje French word was Latinized 16c. to Modern French adjoindre. Related: Adjoined; adjoining.

Thomas Barlow

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Re: Petermann Gletscher / Petermann Fjord / North West Greenland
« Reply #627 on: Today at 04:32:22 AM »
Petermann weak spot confirmed.
« Last Edit: Today at 04:38:04 AM by Thomas Barlow »

b_lumenkraft

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Re: Petermann Gletscher / Petermann Fjord / North West Greenland
« Reply #628 on: Today at 07:08:55 AM »
When Thomas? This summer?