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Author Topic: Petermann Gletscher / Petermann Fjord / North West Greenland  (Read 188792 times)

Tor Bejnar

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Re: Petermann Gletscher / Petermann Fjord / North West Greenland
« Reply #550 on: June 22, 2018, 03:56:09 PM »
Tracy and Heilprin Glaciers (see recent post - with map)
OMG, the water's warm! NASA study solves glacier puzzle
in Psy.Org - June 22, 2018 by Alan Buis, Jet Propulsion Laboratory
Quote
A new NASA study explains why the Tracy and Heilprin glaciers, which flow side by side into Inglefield Gulf in northwest Greenland, are melting at radically different rates.

Using ocean data from NASA's Oceans Melting Greenland (OMG) campaign, the study documents a plume of warm water flowing up Tracy's underwater face, and a much colder plume in front of Heilprin. Scientists have assumed plumes like these exist for glaciers all around Greenland, but this is the first time their effects have been measured.
...
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Tor Bejnar

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Re: Petermann Gletscher / Petermann Fjord / North West Greenland
« Reply #551 on: July 18, 2018, 04:21:51 PM »
Petermann Glacier's mid-glacier transverse crevasse is 'full' of water.  Sentinel-hub Playground images from July 16.  By comparing the colors in the mid-glacier stream with the crevasse water, it appears to me that deeper water is darker blue.  Clearly, the crevasse is not draining at this time (which rather surprises me).  (image has a '100 m' scale showing) 

Edits: A year ago (2017-8-29) shows a different distribution of water, including, it seems, water in the middle of the crevasse instead of the up-steam edge.  Crevasse is wider now.
« Last Edit: July 18, 2018, 04:51:05 PM by Tor Bejnar »
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Tor Bejnar

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Re: Petermann Gletscher / Petermann Fjord / North West Greenland
« Reply #552 on: July 19, 2018, 09:28:15 PM »
What a difference a day can make (July 17 and July 18 - dates at top of gif): check out the higher resolution Sentinel-hub images.
Looks like the drain was pulled.  Or did something else happen? (e.g., big wet blotches disappeared, too.  Sun angle? Deep freeze?  [No clouds nearby])

That was "Natural Color".
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Tor Bejnar

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Re: Petermann Gletscher / Petermann Fjord / North West Greenland
« Reply #553 on: July 23, 2018, 09:38:31 PM »
In yesterday's PolarView, I see lineations on Petermann Glacier again (still): this time a fairly straight one within the long oval going from edge to mid-glacier crevasse.  (Second image has suggestive dots.  There are alternate routes.)  There is a parallel lineation segment just below the dashed like.  (I don't see anything on Sentinel-hub Playground to support there being a crack here.)

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Phil.

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Re: Petermann Gletscher / Petermann Fjord / North West Greenland
« Reply #554 on: July 25, 2018, 10:59:53 PM »
As of the 23rd a large floe has broken loose and has started moving.

http://ocean.dmi.dk/arctic/images/MODIS/Kennedy/20180724AQUA.jpg

Thomas Barlow

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Re: Petermann Gletscher / Petermann Fjord / North West Greenland
« Reply #555 on: July 27, 2018, 04:09:19 AM »
What do you think?
Any chance of these breaking off later this year?
On the south side.
« Last Edit: July 31, 2018, 06:34:53 AM by Thomas Barlow »

Phil.

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Neven

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Re: Petermann Gletscher / Petermann Fjord / North West Greenland
« Reply #557 on: July 30, 2018, 08:27:13 PM »
Darn it, too busy. How big is this one compared to the previous two?
Compare, compare, compare

Tor Bejnar

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Re: Petermann Gletscher / Petermann Fjord / North West Greenland
« Reply #558 on: July 30, 2018, 09:05:03 PM »
Neven, it is just sea ice that has broken off the front of the glacier.  There is no new iceberg.
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Neven

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Re: Petermann Gletscher / Petermann Fjord / North West Greenland
« Reply #559 on: July 31, 2018, 12:15:34 AM »
Thanks, Tor! I thought it looked too blue to be true.
Compare, compare, compare

Thomas Barlow

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Re: Petermann Gletscher / Petermann Fjord / North West Greenland
« Reply #560 on: August 01, 2018, 04:02:15 AM »
Yea, not  the sea-ice. The other bits look precarious on that south side is what I was looking at, but I'm realizing they are much more stable than they look.
« Last Edit: August 01, 2018, 04:08:37 AM by Thomas Barlow »

Espen

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Re: Petermann Gletscher / Petermann Fjord / North West Greenland
« Reply #561 on: August 12, 2018, 04:46:35 PM »
It looks like we had a tiny calving at Petermann, no risk for shipping or sea level rise, the small inserted image from today August 12 2018 07:45 UTC Aqua / MODIS, the calving is in the middle of glacier front above the pink arrow.
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Espen

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Re: Petermann Gletscher / Petermann Fjord / North West Greenland
« Reply #562 on: August 12, 2018, 11:20:34 PM »
False alarm

Here is the a link to the image from where I got the wrong information, sorry:

https://lance.modaps.eosdis.nasa.gov/cgi-bin/imagery/single.cgi?image=crefl2_143.A2018224074500-2018224075000.2km.jpg
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Espen

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Re: Petermann Gletscher / Petermann Fjord / North West Greenland
« Reply #563 on: August 31, 2018, 09:56:32 PM »
A minor starboard calving has happened at Petermann Gletscher:
« Last Edit: August 31, 2018, 10:07:39 PM by Espen »
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Alistair

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Re: Petermann Gletscher / Petermann Fjord / North West Greenland
« Reply #564 on: September 07, 2018, 04:27:01 PM »
A significant calving? (Worldview from 5/9, can't see anything for clouds on 6/9)  Or is this just worldview drawing a previous line?

Alistair

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Re: Petermann Gletscher / Petermann Fjord / North West Greenland
« Reply #565 on: September 07, 2018, 04:33:41 PM »
Ignore previous post - looks like it is a feature of Worldview I hadn't noticed before.

Tor Bejnar

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Re: Petermann Gletscher / Petermann Fjord / North West Greenland
« Reply #566 on: September 11, 2018, 04:06:59 PM »
New ice in Petermann Fjord. (Sentinel-hub Playground)
P.S. The ~700 m wide rhombus (diamond) shaped iceberg near the left shore short broke off of Petermann Glacier between September 5 and 7.
« Last Edit: September 11, 2018, 08:35:20 PM by Tor Bejnar »
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Phil.

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Re: Petermann Gletscher / Petermann Fjord / North West Greenland
« Reply #567 on: September 11, 2018, 06:47:20 PM »
New ice in Petermann Fjord. (Sentinel-hub Playground)
P.S. The ~700 m wide rhombus (diamond) shaped iceberg near the left short broke off of Petermann Glacier between September 5 and 7.

Looks like there could be a couple more fragments in the near future too.


Tealight

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Re: Petermann Gletscher / Petermann Fjord / North West Greenland
« Reply #569 on: October 10, 2018, 11:16:52 PM »
It looks like the big side crack made a turn and started growing towards the centre crack. When they connect the next big calving is 3/4 complete.

http://bslmagb.nerc-bas.ac.uk/iwsviewer/?image=DataPolarview/111_S1jpeg2000_201810/S1A_IW_GRDH_1SDH_20181010T113546_FB8F_N_1.8bit.jp2

Espen

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Re: Petermann Gletscher / Petermann Fjord / North West Greenland
« Reply #570 on: October 11, 2018, 10:00:30 PM »
It looks like the big side crack made a turn and started growing towards the centre crack. When they connect the next big calving is 3/4 complete.

http://bslmagb.nerc-bas.ac.uk/iwsviewer/?image=DataPolarview/111_S1jpeg2000_201810/S1A_IW_GRDH_1SDH_20181010T113546_FB8F_N_1.8bit.jp2

Tealight nice spotting, we may have a very large calving next summer?
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