Arctic Sea Ice : Forum

Cryosphere => Greenland and Arctic Circle => Topic started by: Espen on August 28, 2013, 03:36:06 PM

Title: Helheim Gletscher / Fernisgletscher / South East Greenland
Post by: Espen on August 28, 2013, 03:36:06 PM
Calving Event
Great video from July 24 2013 Helheim Calving Event by Hans Henrik Tholstrup, the clip was made by an "accident", a Geologist wanted to pick up some some pieces of rocks nearby, and then the whole "Rock Concert" started across the fjord.

https://www.youtube.com/watch?v=TrtONyTuZgo (https://www.youtube.com/watch?v=TrtONyTuZgo)
Title: Re: Helheim Gletscher / South East Greenland
Post by: Espen on August 28, 2013, 03:59:51 PM
Thanks to the video above I have a animation ready, showing the calving on July 24 2013.

Please click on image to enlarge and start the animation!
Title: Re: Helheim Gletscher / South East Greenland
Post by: Espen on August 30, 2013, 09:29:45 AM
I have just updated the Helheim calving animation with more frames, since there obviously were several dates of calving events, please check it out on the Petermann thread:

https://forum.arctic-sea-ice.net/index.php/topic,270.msg14130.html#msg14130ing li

In the image below you see the pre-calving line June 2013 (red line) and the retreat between June 2013 and August was up to 1.4 km.
Title: Re: Helheim Gletscher / South East Greenland
Post by: Espen on August 30, 2013, 11:15:12 AM
Maybe an evidence of melt water channels?

Please click on image to enlarge!
Title: Re: Helheim Gletscher / South East Greenland
Post by: Espen on August 30, 2013, 02:24:11 PM
A little more information on Helheim and a how big the recent calving was compared to the years since 1972. You can see from the series of images from 1972 - 2013, that roughly 25 % *) of all ice lost since 1972 was lost in the period from mid June 16 2013 to Aug 19 2013.
The red line at both Helheim Gletscher  and Fernis Gletscher indicates the 1972 calving line, and the yellow line at Helheim the calving line prior to the 2013 calving series (June 16 2013).

*) Growth of glacier in the period excluded.
 

Please click on image to enlarge.
Title: Re: Helheim Gletscher / South East Greenland
Post by: Andreas Muenchow on August 31, 2013, 01:44:56 PM
Quote from: Espen
Maybe an evidence of melt water channels?
Probably not. The melt-channels of Pine Island and Petermann Glaciers are at the bottom of floating ice shelves where they contact the ocean and often extend  >10 km along the shelf often originating at the grounding line. Helheim Glacier does not have an ice shelf as it is grounded entirely on bed rock. It has large crevasses, though which I suspect is what shows after the chip of ice broke off and tipped over to become a large iceberg.
Title: Re: Helheim Gletscher / Fernisgletscher / South East Greenland
Post by: Espen on August 31, 2013, 06:25:00 PM
When watching the video above, I noticed those 2 holes came up from below sea/ice level, and the ice cliff of Helheim is +/- 100 meter, and from what I see from the picture is smoothed edges around them and deeper blue color indicating another surface as well.
Title: Re: Helheim Gletscher / Fernisgletscher / South East Greenland
Post by: Espen on February 14, 2014, 10:04:29 AM
First sighting of Helheim Glacier by Landsat:

 
Title: Re: Helheim Gletscher / Fernisgletscher / South East Greenland
Post by: Espen on March 31, 2014, 07:52:19 PM
Calving event:

Helheim Gletscher did a +/- 1 km calving between March 16 and March 30 2014. Remember the glacier is 5,7 km wide at the calving front.

Please click on image to enlarge and start animation!
Title: Re: Helheim Gletscher / Fernisgletscher / South East Greenland
Post by: Shared Humanity on April 01, 2014, 12:05:31 AM
It is amazing how fast the previously calved bergs move down the fjord.
Title: Re: Helheim Gletscher / Fernisgletscher / South East Greenland
Post by: Espen on April 12, 2014, 01:35:17 PM
Further calving action at Helheimgletscher:

Please click on image to start animation!
Title: Re: Helheim Gletscher / Fernisgletscher / South East Greenland
Post by: Espen on April 12, 2014, 05:21:09 PM
Be aware, Helheim is fast moving monster (probably why it is named so), the calving line seen late 2013 moved some 2 -  3 km during the winter, we will follow it during the season to see where it ends this season.
BTW, IceBridge 2014 is flying above Helheim at this very moment!
Title: Re: Helheim Gletscher / Fernisgletscher / South East Greenland
Post by: Wipneus on April 16, 2014, 10:23:33 AM
Espen suggested an animation in natural colors. Here is one for March 16 to April 15 in 15m resolution.
The last frame has an arrow drawn showing the movement in those 30 days. The arrow is 38pix to the right and 12pix down. That translates to approximately 598 m, or 19.9 m/day.
To my limited knowledge that translates to "fast", but not as fast my Jakobshavn measurement that was about 28m/day.

Not that the rocks on the north of the glaciers seem to wobble a bit, this is caused by the landsat images picked from different paths: you are not seeing them from the same angle. For the glacier ice it should not matter as that has more or less the same elevation.

(click the picture for the animation to start )
Title: Re: Helheim Gletscher / Fernisgletscher / South East Greenland
Post by: Espen on May 02, 2014, 07:17:37 AM
Further action at Helheim:

Please click on image to start animation!
Title: Re: Helheim Gletscher / Fernisgletscher / South East Greenland
Post by: Shared Humanity on May 02, 2014, 04:54:13 PM
OK.....stupid question.

It appears as if the 2 distinct flows of ice (I can't name them but the larger flow from the top of the image and more narrow flow from the bottom) behave differently at the calving face. The wider flow from the top appears to calve more readily. What would cause this?
Title: Re: Helheim Gletscher / Fernisgletscher / South East Greenland
Post by: Espen on May 02, 2014, 06:40:09 PM
Mai ru. :(
Title: Re: Helheim Gletscher / Fernisgletscher / South East Greenland
Post by: Espen on May 10, 2014, 10:12:02 PM
May 10 update:

Notice how the whole glacier is moving and not only at the calving front, it is just amazing :)!
Title: Re: Helheim Gletscher / Fernisgletscher / South East Greenland
Post by: Espen on May 10, 2014, 10:45:19 PM
To better illustrate the movement of this massive ice machine, the encircled part is approximately 30 - 37 km from the calving front of Helheim Glacier. And we are only seeing 10 days of action!

There is map image below the animation.

Please click on the image to start the animation!
Title: Re: Helheim Gletscher / Fernisgletscher / South East Greenland
Post by: Espen on May 11, 2014, 02:19:06 PM
Helheim (1.) is qualified to be on of the four super iceways of Greenland together with Jakobshavn (2.), Petermann / Humboldt (3.) and Zachariae (4.).

Title: Re: Helheim Gletscher / Fernisgletscher / South East Greenland
Post by: sidd on May 11, 2014, 10:56:15 PM
Here are some pics of Helheim

1)Rignot(2012) velocity map
2)Bamber(2013), 200m bedrock contours (resolution here is sparse, as you can see from the blocking artefacts)
3)50 m surface contour overlaid over bedrock

sidd
Title: Re: Helheim Gletscher / Fernisgletscher / South East Greenland
Post by: sidd on May 11, 2014, 11:02:51 PM
one more. 200 m bedrock contour again, but zoomed out. And one comment. Espen speaks of Helheim "pulling" the ice upstream; this is calculated in a Pattyn(?) paper as "membrane stress" transmitted over large distances in hours, as oppesed to much slower plastic, viscous deformation. Unfortunately i cannot recall the reference, i am very pressed for time. or i would look it up.

sidd
Title: Re: Helheim Gletscher / Fernisgletscher / South East Greenland
Post by: Espen on May 12, 2014, 05:16:04 PM
Thanks Sidd,

That really explains why the North Western branch, is the dominating part of the Helheim Glacier System, just puzzled about the moving "island" in the animation is due to a high elevation bedrock or a depression, due to the slope?
Title: Re: Helheim Gletscher / Fernisgletscher / South East Greenland
Post by: sidd on May 13, 2014, 12:30:35 AM
I think it is the depression in the bedrok, but i am not sure. There is probably water under there, a detailed hydrological analysis would reveal more, but i have no time to do the calculation (it is affected by surface slope) I will probably await a paper like the Lewis analysis which i have referred to elsewhere.

sidd
Title: Re: Helheim Gletscher / Fernisgletscher / South East Greenland
Post by: Espen on May 17, 2014, 09:56:02 PM
Another week of action, notice the speed of this monster.

Please click on image to start animation:
Title: Re: Helheim Gletscher / Fernisgletscher / South East Greenland
Post by: Espen on May 20, 2014, 05:38:02 AM
More calving at Helheim:
Title: Re: Helheim Gletscher / Fernisgletscher / South East Greenland
Post by: Buddy on May 20, 2014, 12:38:06 PM
Wow...nice sequence.  If it keeps up that speed....it will almost make it back to the confluence of the two main glaciers in another couple of months.
Title: Re: Helheim Gletscher / Fernisgletscher / South East Greenland
Post by: Espen on May 26, 2014, 09:17:46 PM
Helheim update:

As you see, there is a lot happening around Helheim these days, notice the newly developed melt ponds around on top of the glacier:

Please click on image to start animation!
Title: Re: Helheim Gletscher / Fernisgletscher / South East Greenland
Post by: Shared Humanity on May 26, 2014, 10:44:09 PM
Seems like a lot of calving too.
Title: Re: Helheim Gletscher / Fernisgletscher / South East Greenland
Post by: Espen on June 20, 2014, 08:54:57 PM
A Helheim update is due:

Click on image to start animation!
Title: Re: Helheim Gletscher / Fernisgletscher / South East Greenland
Post by: Espen on July 03, 2014, 07:42:07 PM
When Landsat is ready, I am! But in the meantime I can observe we had some heavy calving and maybe even retreat (with the help of Modis).


Title: Re: Helheim Gletscher / Fernisgletscher / South East Greenland
Post by: Espen on July 05, 2014, 06:28:39 AM
More massive calving at Helheim Gletscher:

Please click on image to start animation!
Title: Re: Helheim Gletscher / Fernisgletscher / South East Greenland
Post by: Laurent on July 05, 2014, 08:08:30 AM
Hello Espen,
Thanks for your great work. Can you add automaticaly a scale in your post ? if easily done !
Title: Re: Helheim Gletscher / Fernisgletscher / South East Greenland
Post by: TerryM on July 05, 2014, 08:15:55 AM
Espen
Can't help but think that those bare rocks storing a lot of heat.


Terry
Title: Re: Helheim Gletscher / Fernisgletscher / South East Greenland
Post by: Espen on July 05, 2014, 10:36:34 AM
Laurent, the width of the glacier is +/- 6 km.
Title: Re: Helheim Gletscher / Fernisgletscher / South East Greenland
Post by: Laurent on July 05, 2014, 12:32:35 PM
So around 1km retreat in 15 days...
Title: Re: Helheim Gletscher / Fernisgletscher / South East Greenland
Post by: Espen on July 05, 2014, 12:41:55 PM
Laurent,

Not retreat, but +/- 1 km was calved, the calving front was further back in Sep/Oct 2013.
Title: Re: Helheim Gletscher / Fernisgletscher / South East Greenland
Post by: crandles on July 05, 2014, 12:58:14 PM
Laurent,

Not retreat, but +/- 1 km was calved, the calving front was further back in Sep/Oct 2013.

was just going to say still not quite back to where it was in Sep 06 or Aug 13. But then it is only July.

(https://forum.arctic-sea-ice.net/proxy.php?request=http%3A%2F%2Fforum.arctic-sea-ice.net%2Findex.php%3Faction%3Ddlattach%3Btopic%3D553.0%3Battach%3D3737%3Bimage&hash=1cf9201a7842a1de2861cb869247a562)
Title: Re: Helheim Gletscher / Fernisgletscher / South East Greenland
Post by: Espen on July 05, 2014, 02:47:57 PM
To clear up thing, here is the calving front September 3 2013 vs. July 4 2014:

Please click on image to enlarge!
Title: Re: Helheim Gletscher / Fernisgletscher / South East Greenland
Post by: Espen on July 14, 2014, 09:29:00 PM
Helheim update:

Since July 4, Helheim only expanded, but its the fjord system sister Fernisgletscher seen to the right in the animation below, is now in the retreat zone:

Please click on image to start the animation!
Title: Re: Helheim Gletscher / Fernisgletscher / South East Greenland
Post by: Shared Humanity on July 16, 2014, 02:45:47 PM
Espen...

In this last image, as the sea ice melts, you can see large areas of the water that have a tan color. Is this sediment?
Title: Re: Helheim Gletscher / Fernisgletscher / South East Greenland
Post by: Espen on July 16, 2014, 04:23:35 PM
Espen...

In this last image, as the sea ice melts, you can see large areas of the water that have a tan color. Is this sediment?

Shared Humanity,

Tan color, where?
Title: Re: Helheim Gletscher / Fernisgletscher / South East Greenland
Post by: solartim27 on July 16, 2014, 05:27:38 PM
I think it's the rock erosion on the upper right side.
Title: Re: Helheim Gletscher / Fernisgletscher / South East Greenland
Post by: Espen on July 22, 2014, 10:36:57 PM
Another week with serious calving:

Please click on image to start animation!
Title: Re: Helheim Gletscher / Fernisgletscher / South East Greenland
Post by: Espen on August 24, 2014, 10:56:45 AM
Helheim Gletscher update, nothing much happened since last time, but the neighbor glacier Fernisgletscher is in the retreat zone.
Title: Re: Helheim Gletscher / Fernisgletscher / South East Greenland
Post by: Shared Humanity on August 24, 2014, 03:07:15 PM
Is that smoke that is obscuring the view on the July image? I first thought it was silt in the water.
Title: Re: Helheim Gletscher / Fernisgletscher / South East Greenland
Post by: Espen on August 24, 2014, 03:34:25 PM
SH, No it is ordinary clouds, I know what you are hinting, but smoke is more uniform.
Title: Re: Helheim Gletscher / Fernisgletscher / South East Greenland
Post by: solartim27 on January 20, 2015, 07:28:31 AM
Espen's post on another topic about Midtgårdgletscher led me to look at what I could see on Sentinel.  I think I'm seeing a big collapse off the front of Helheim.  Any thoughts?
Dates are 1/9, 1/14, 1/16
Title: Re: Helheim Gletscher / Fernisgletscher / South East Greenland
Post by: Lennart van der Linde on January 20, 2015, 07:33:25 AM
That looks huge! How many km retreat would that be, in one week?
Title: Re: Helheim Gletscher / Fernisgletscher / South East Greenland
Post by: solartim27 on January 20, 2015, 07:46:16 AM
Aprevious post said the channel was 6 km wide, so I would ballpark about 6 km.  I also think it might just be sea ice breaking up, and not a real calving event, but I still wouldn't expect to see that in January.
Title: Re: Helheim Gletscher / Fernisgletscher / South East Greenland
Post by: werther on January 20, 2015, 10:29:55 AM
Tim, hi,
I posted a detail around Helheim in the 'retreat'-thread. As you can see over there, Helheim glacier  already retreated to just 6 km from the steep slope into the mainland by '09.

What is seen on the Sentinel image illustrates the difficulties in interpreting the different properties of the features on most images. Sentinel is radar, right? I suggest the backscatter would represent the chaotic debris in the fjord as blanketwhite as we imagine a glacier to be.
In summer, MODIS true color provides a better tool to interpret these differences.

Never mind, my first post on Neven's blog was about a swath of meltwater I thought to notice on Kangerdlugssuaq glacier. It turned out to be a shadow from clouds around a nunatakker .
Title: Re: Helheim Gletscher / Fernisgletscher / South East Greenland
Post by: nukefix on January 20, 2015, 12:03:03 PM
With high-res S-1 a large collapse should be easily recognizable...if only I had time today...
Title: Re: Helheim Gletscher / Fernisgletscher / South East Greenland
Post by: nukefix on January 22, 2015, 11:13:34 AM
S-1 19.1.2015 shows that Helheim has experienced a rather large calving event recently. The largest black capsized icebergs in front on the calving front are 700+ meters wide.
Title: Re: Helheim Gletscher / Fernisgletscher / South East Greenland
Post by: nukefix on January 22, 2015, 04:24:54 PM
It seems like Helheim calved earlier than 10.1 as this EW-image shows that the big icebergs are already there. EW with its 40m pixel-size is clearly less useful for calving front mapping than the IW-mode...
Title: Re: Helheim Gletscher / Fernisgletscher / South East Greenland
Post by: Espen on January 30, 2015, 09:07:56 PM
I feel good! Spring is back!!!! ;)
Title: Re: Helheim Gletscher / Fernisgletscher / South East Greenland
Post by: Tor Bejnar on January 30, 2015, 09:19:45 PM
Looks like you are mid-winter sleepwalking to me!  You call this Spring? :P
Title: Re: Helheim Gletscher / Fernisgletscher / South East Greenland
Post by: Espen on January 30, 2015, 09:22:29 PM
Looks like you are mid-winter sleepwalking to me!  You call this Spring? :P

When there is shades, there is sun, and that is spring!
Title: Re: Helheim Gletscher / Fernisgletscher / South East Greenland
Post by: solartim27 on February 24, 2015, 07:02:52 PM
Continues the trend of calving in winter.  Click to animate.
Title: Re: Helheim Gletscher / Fernisgletscher / South East Greenland
Post by: solartim27 on February 24, 2015, 09:07:06 PM
Some good articles on the area:
http://glacierresearch.com/locations/helheim/overview.html (http://glacierresearch.com/locations/helheim/overview.html)

Perhaps we'll beat the 2005 line this year?
Image from http://www.arcus.org/witness-the-arctic/2013/3/article/20209 (http://www.arcus.org/witness-the-arctic/2013/3/article/20209)

And a post from werther on another thread:
Detail 3: Helheim glacier, southwest Greenland

(https://forum.arctic-sea-ice.net/proxy.php?request=http%3A%2F%2Fi1036.photobucket.com%2Falbums%2Fa446%2Fhanver1%2FClimate%25202015%2FHelheimJuly2012_zps01e94f55.jpg&hash=ca0050d08621d4ef0dd474a821b883ac)

One of the parts in southwest Greenland where the snow-/ice contour didn’t retreat much. Although the calving front on the Helheim Glacier is very mobile, there’s hardly a pixel-width difference between ’09 and ’12. In my opinion, the calving front is so close to the steep ‘bedrock’ slope into the mainland, that it can hardly retreat. Most of the floating tongue is already lost.
Nevertheless the feeding area keeps producing enough ice to let the glacier produce massive debris each year.
Title: Re: Helheim Gletscher / Fernisgletscher / South East Greenland
Post by: Sleepy on February 25, 2015, 06:42:51 PM
Seasonal dynamic thinning at Helheim Glacier.
http://www.sciencedirect.com/science/article/pii/S0012821X15000588 (http://www.sciencedirect.com/science/article/pii/S0012821X15000588)

Highlights
•TanDEM-X DEMs are used to reveal seasonal thinning on Helheim Glacier.
•Feature tracking for surface speeds ties the thinning to areas of fast-moving ice.
•Bedrock GPS measurements are used to estimate an effective density for the ice loss.
•Annual water equivalent volume loss ranges from 0.5 km3 in 2011 to 1.6 km3 in 2013.
•We conclude that the thinning is dynamic and is driven by melt penetration to the bed.

Title: Re: Helheim Gletscher / Fernisgletscher / South East Greenland
Post by: solartim27 on February 26, 2015, 11:00:41 PM
The video link in the first post does not work anymore.  This is a great video of what these calvings look like from 12 July 2010 from Swansea University
https://www.youtube.com/watch?v=IxfORXWph2Q (https://www.youtube.com/watch?v=IxfORXWph2Q)
Title: Re: Helheim Gletscher / Fernisgletscher / South East Greenland
Post by: Espen on March 01, 2015, 10:06:16 PM
Almost status quo, although a minor retreat is seen from October 2014:
Title: Re: Helheim Gletscher / Fernisgletscher / South East Greenland
Post by: solartim27 on March 27, 2015, 10:18:12 PM
Almost status quo, although a minor retreat is seen from October 2014:

I am not sure that the position of the calving front is as important as the discharge rate. 

I am curious about the motion of a large bergy bit labeled A in this admittedly poor gif (click to animate).  It seems to go a large distance, would that be from glacial outflow, tidal flushing, or some combination?  There also appears to be some continued small calving in the middle of the front.
Title: Re: Helheim Gletscher / Fenrisgletscher / South East Greenland
Post by: viddaloo on March 27, 2015, 11:04:27 PM
Fenrisgletscher.

Fenris is the Wolf of the Apocalypse in Norse Mythology  ;D
Title: Re: Helheim Gletscher / Fernisgletscher / South East Greenland
Post by: Sleepy on March 28, 2015, 05:15:24 AM
Unfortunately we have cut off Gleipnir.
Title: Re: Helheim Gletscher / Fernisgletscher / South East Greenland
Post by: Hunter on April 13, 2015, 08:36:03 PM
Helheim Flythrough?

https://www.youtube.com/watch?v=y_1VkVNeavE (https://www.youtube.com/watch?v=y_1VkVNeavE)

feel free to turn up or down the music, enjoy! :)
Title: Re: Helheim Gletscher / Fernisgletscher / South East Greenland
Post by: Espen on April 27, 2015, 10:13:06 PM
And here is some action from Helheim Gletscher:
Title: Re: Helheim Gletscher / Fernisgletscher / South East Greenland
Post by: Susan Anderson on May 01, 2015, 05:14:07 PM
Helheim is updated to 30 April.  Light on edge brings it into prominence. Also this:
http://www.nature.com/nature/journal/v497/n7448/full/nature12068.html (http://www.nature.com/nature/journal/v497/n7448/full/nature12068.html)

(one of your lurker fans)
Title: Re: Helheim Gletscher / Fernisgletscher / South East Greenland
Post by: Jim Hunt on May 01, 2015, 05:43:10 PM
Helheim is updated to 30 April.

Which reminds me that Susan is referring to the Helheim webcam (http://glacierresearch.com/locations/helheim/realtime-images-terminus.html) mentioned by Kris on the ASIB (http://neven1.typepad.com/blog/2015/04/cryosat-sea-ice-thickness-maps.html?cid=6a0133f03a1e37970b01b7c78241cd970b#comment-6a0133f03a1e37970b01b7c78241cd970b):
Title: Re: Helheim Gletscher / Fernisgletscher / South East Greenland
Post by: Shared Humanity on May 02, 2015, 03:10:16 AM
Good  God! Scroll through the photos of Helheim Glacier from March till today. This glacier is kicking off mountains of ice.
Title: Re: Helheim Gletscher / Fernisgletscher / South East Greenland
Post by: solartim27 on May 02, 2015, 06:35:10 AM
Good  God! Scroll through the photos of Helheim Glacier from March till today. This glacier is kicking off mountains of ice.
Get a hold of yourself man!  The calving front is relatively stationary so everything is fine! 
Title: Re: Helheim Gletscher / Fernisgletscher / South East Greenland
Post by: Espen on May 02, 2015, 11:52:23 AM
Good  God! Scroll through the photos of Helheim Glacier from March till today. This glacier is kicking off mountains of ice.
Get a hold of yourself man!  The calving front is relatively stationary so everything is fine!

? It may be necessary to move the camera?
Title: Re: Helheim Gletscher / Fernisgletscher / South East Greenland
Post by: Espen on May 03, 2015, 10:07:45 PM
Helheim between April 30 and May 3 2015 another big chunk took off:
Title: Re: Helheim Gletscher / Fernisgletscher / South East Greenland
Post by: Espen on May 05, 2015, 05:37:58 PM
Here is the calving mentioned in the above web-cam animation seen from a LandSat perspective:
Title: Re: Helheim Gletscher / Fernisgletscher / South East Greenland
Post by: solartim27 on May 09, 2015, 06:48:21 AM
Nothing to see here, please move along.  Everything is fine.

Http://ocean.dmi.dk/arctic/image_container.puppup (http://Http://ocean.dmi.dk/arctic/image_container.puppup)

Edit:  Looked like a big change, but that link doesn't come up right, and I can't get onto the site right now to post a screen shot.
Title: Re: Helheim Gletscher / Fernisgletscher / South East Greenland
Post by: Jim Hunt on May 09, 2015, 10:00:13 AM
I can't get onto the site right now to post a screen shot.

Neither can I. DMI seems to be down?

When it returns, linking to the "image_container" never works. You have to grab a copy of (or link to) the image itself.
Title: Re: Helheim Gletscher / Fernisgletscher / South East Greenland
Post by: solartim27 on May 09, 2015, 05:07:16 PM
This image says it's from 7 May, but I can't find it in the Polar View images, or any since then.  It's from DMI, so resolution isn't that great.

Edit:  Glacier Research finally updated, with no major changes
http://glacierresearch.com/locations/helheim/realtime-images-terminus.html (http://glacierresearch.com/locations/helheim/realtime-images-terminus.html)
Title: Re: Helheim Gletscher / Fernisgletscher / South East Greenland
Post by: Espen on May 17, 2015, 10:45:56 AM
Helheim Gletscher at work:
Title: Re: Helheim Gletscher / Fernisgletscher / South East Greenland
Post by: Espen on May 31, 2015, 10:30:57 AM
Some more calving activities at Helheim between May 27 and May 30 2015:
Title: Re: Helheim Gletscher / Fernisgletscher / South East Greenland
Post by: Espen on June 10, 2015, 07:29:28 PM
Helheim update, snow retreat and glacier gain:
Title: Re: Helheim Gletscher / Fernisgletscher / South East Greenland
Post by: A-Team on June 11, 2015, 04:31:15 PM
The youtube link is broken in post #1 of this forum, Helheim Glacier calving by Hans Henrik Tholstrup. The link is now http://www.youtube.com/watch?v=4BJNOvB5QKU.# (http://www.youtube.com/watch?v=4BJNOvB5QKU.#)

I came across a 2001-2005 time series that was interpreted as a retreat progression
http://earthobservatory.nasa.gov/IOTD/view.php?id=6207&eocn=image&eoci=related_image (http://earthobservatory.nasa.gov/IOTD/view.php?id=6207&eocn=image&eoci=related_image)

Howat, I. M., I. Joughin, S. Tulaczyk, and S. Gogineni (2005). Rapid retreat and acceleration of Helheim Glacier, east Greenland. Geophysical Research Letters, 32, L22502,
http://onlinelibrary.wiley.com/doi/10.1029/2005GL024737/full (http://onlinelibrary.wiley.com/doi/10.1029/2005GL024737/full) (free full text)

A significant amount of the measured coastal thinning of the Greenland ice sheet may be due to recent acceleration of outlet glaciers. Using remote sensing, we measured two major periods of speedup on Helheim Glacier between 2000 and 2005 that increased peak speeds from approximately 8 to 11 km/yr. These speedups coincided with rapid retreats of the calving front, totaling over 7.5 km. The glacier also thinned by over 40 m from 2001 to 2003. Retreat of the ice front appears to decrease resistance to flow and concentrates the gravitational driving force over a smaller area. Farther up-glacier, acceleration may be a delayed response to surface draw-down and steepening of the glacier's main trunk. If the 2005 speedup also produces strong thinning, then much of the glacier's main trunk may un-ground, leading to further retreat.
Title: Re: Helheim Gletscher / Fernisgletscher / South East Greenland
Post by: Tor Bejnar on June 26, 2015, 05:47:49 PM
Reverse glacier motion during iceberg calving and the cause of glacial earthquakes
 (http://www.sciencemag.org/content/early/2015/06/24/science.aab0460.abstract)
Abstract:
Quote
Nearly half of Greenland’s mass loss occurs through iceberg calving, but the physical mechanisms operating during calving are poorly known and in situ observations are sparse. We show that calving at Greenland’s Helheim Glacier causes a minutes-long reversal of the glacier’s horizontal flow and a downward deflection of its terminus. The reverse motion results from the horizontal force caused by iceberg capsize and acceleration away from the glacier front. The downward motion results from a hydrodynamic pressure drop behind the capsizing berg, which also causes an upward force on the solid Earth. These forces are the source of glacial earthquakes, globally detectable seismic events whose proper interpretation will allow remote sensing of calving processes occurring at increasing numbers of outlet glaciers in Greenland and Antarctica.

(cross posted at 'Earthquakes')
Title: Re: Helheim Gletscher / Fernisgletscher / South East Greenland
Post by: Espen on June 27, 2015, 09:35:19 PM
On the move, these 2 images are 24 hours apart June 26 and June 27 2015 :
Title: Re: Helheim Gletscher / Fernisgletscher / South East Greenland
Post by: Espen on July 05, 2015, 05:47:35 PM
Helheim in growth mode, between June 6 and July 6 2015, notice the disappearance of snow on the rocks:
Title: Re: Helheim Gletscher / Fernisgletscher / South East Greenland
Post by: Espen on July 08, 2015, 06:01:28 PM
A large piece of ice took off between July 7 and July 8 2015:
Title: Re: Helheim Gletscher / Fernisgletscher / South East Greenland
Post by: Espen on July 16, 2015, 07:31:54 PM
A large calving at Helheim Gletscher between July 14 and July 17 2015:
Title: Re: Helheim Gletscher / Fernisgletscher / South East Greenland
Post by: Tor Bejnar on July 16, 2015, 09:37:16 PM
On the near side, a little more retreat than where it was on May 3, 2015.  (See above for images.) [I'm just not looking at the far side.]  Someone spoke my mind in May about the camera needing to be shifted 'soon'; then the glacier face advanced for a while.
Title: Re: Helheim Gletscher / Fernisgletscher / South East Greenland
Post by: Espen on July 16, 2015, 10:24:26 PM
The above mentioned calving can be watched from above with the newly released Landsat images:
Title: Re: Helheim Gletscher / Fernisgletscher / South East Greenland
Post by: solartim27 on July 16, 2015, 10:56:49 PM
There are some strange color changes on the glacier, sort of looks like melt ponds draining.  Any thoughts?
Title: Re: Helheim Gletscher / Fernisgletscher / South East Greenland
Post by: solartim27 on August 25, 2015, 08:35:24 PM
Helheim had another big calving between 8/22 - 23, the terminus camera has not updated.
http://www.glacierresearch.com/locations/helheim/realtime-images-terminus.html (http://www.glacierresearch.com/locations/helheim/realtime-images-terminus.html)
Title: Re: Helheim Gletscher / Fernisgletscher / South East Greenland
Post by: nukefix on August 26, 2015, 11:15:28 AM
Here is S-1 IW HH from 23.8.2015 in WGS84 Polar Stereographic in 15m pixel size.
Title: Re: Helheim Gletscher / Fernisgletscher / South East Greenland
Post by: nukefix on August 26, 2015, 03:14:15 PM
The same in UTM24 15m
Title: Re: Helheim Gletscher / Fernisgletscher / South East Greenland
Post by: solartim27 on September 05, 2015, 07:01:10 AM
Here's the view from the terminus camera, 8-21 - 8/29
Title: Re: Helheim Gletscher / Fernisgletscher / South East Greenland
Post by: Espen on October 04, 2015, 09:33:45 PM
Both Helheim Gletscher and Fernisgletscher are ending 2015 at record lows (retreat), I will add more documentation in the next few days (been in Sweden picking mushrooms for 2 days):

Please click on image to enlarge!
Title: Re: Helheim Gletscher / Fernisgletscher / South East Greenland
Post by: Espen on October 05, 2015, 09:02:14 PM
Here is a large animation showing how Helheim (to the left) Fernisgletscher (in the middle) and Midgårdgletscher (to the right) behaved in the period of 1972 to 2015.
Not only did all 3 glaciers retreat in the period, some more than others, especially Midgårdgletscher went way up the valley. All 3 glaciers are now at record retreat position.:

Please click on image to animate and enlarge!
Title: Re: Helheim Gletscher / Fernisgletscher / South East Greenland
Post by: oren on October 06, 2015, 12:55:43 AM
Here is a large animation showing how Helheim (to the left) Fernisgletscher (in the middle) and Midgårdgletscher (to the right) behaved in the period of 1972 to 2015.
Not only did all 3 glaciers retreat in the period, some more than others, especially Midgårdgletscher went way up the valley. All 3 glaciers are now at record retreat position.:

Please click on image to animate and enlarge!

Thanks for this wonderful animation.
Interesting that the period 1986-1997 saw less retreat (or even advance) compared to the other periods.
The "Midgard" glacier has literally gone around the bend in the last period 1997-2014. Impressive.
Title: Re: Helheim Gletscher / Fernisgletscher / South East Greenland
Post by: Espen on October 21, 2015, 09:49:49 PM
I was a bit too early on Oct. 4 2015 claiming that this was the end of the season for Helheim, but now Helheim calves and retreat to another record low:

Title: Re: Helheim Gletscher / Fernisgletscher / South East Greenland
Post by: Espen on October 23, 2015, 09:20:34 PM
I revised the Helheim Gletscher year end report because for some reason Helheim decided to calve and retreat to a new record low:

Click on image to enlarge and animate!
Title: Re: Helheim Gletscher / Fernisgletscher / South East Greenland
Post by: Espen on November 14, 2015, 10:06:04 PM
Helheim Gletscher November 2015, changing mode, opposite what is normal during winter stays at record low, retreat wise, and is prone for further calving and retreat:

(Would not like doing cross country on that surface)
Title: Re: Helheim Gletscher / Fernisgletscher / South East Greenland
Post by: Espen on December 20, 2015, 10:22:30 AM
Helheim update, and not part of the Melville debacle, is still moving despite the winter darkness:
Title: Re: Helheim Gletscher / Fernisgletscher / South East Greenland
Post by: doogi on March 02, 2016, 03:38:12 PM
The Helheim webcam (http://glacierresearch.com/locations/helheim/realtime-images-terminus.html) is back on line:

Title: Re: Helheim Gletscher / Fernisgletscher / South East Greenland
Post by: Espen on April 07, 2016, 06:21:50 PM
A large claving session happened at Helheim Gletscher between March 26 and April 7 2016
Notice the large tabular "cubes":

Please click on image to enlarge and animate!
Title: Re: Helheim Gletscher / Fernisgletscher / South East Greenland
Post by: Espen on May 22, 2016, 09:42:20 PM
Calving action at Helheim Gletscher:
Title: Re: Helheim Gletscher / Fernisgletscher / South East Greenland
Post by: Espen on May 24, 2016, 07:12:24 PM
The latest calving seen from above:
Title: Re: Helheim Gletscher / Fernisgletscher / South East Greenland
Post by: solartim27 on June 24, 2016, 08:58:39 PM
Pretty good size calving recently, but flipping back through the images, it looks mostly like a conveyor belt.
http://glacierresearch.com/locations/helheim/realtime-images-terminus.html (http://glacierresearch.com/locations/helheim/realtime-images-terminus.html)
Title: Re: Helheim Gletscher / Fernisgletscher / South East Greenland
Post by: solartim27 on July 28, 2016, 07:20:13 AM
Well, that was a big one.
http://glacierresearch.com/locations/helheim/realtime-images-terminus.html (http://glacierresearch.com/locations/helheim/realtime-images-terminus.html)
July 27, 2 am to 2 pm.
Title: Re: Helheim Gletscher / Fernisgletscher / South East Greenland
Post by: Espen on January 07, 2017, 02:00:55 PM
Helheim Gletscher update:

Large calving observed at Helheim between December 29 2016 and January 4 2017.
At the same time we are into record retreat terratory.

Click on image to enlarge and animate!
Title: Re: Helheim Gletscher / Fernisgletscher / South East Greenland
Post by: DrTskoul on January 07, 2017, 02:18:27 PM
How does the location of the terminus compares to past summer and previous years ?

Thanks for the update Espen.
Title: Re: Helheim Gletscher / Fernisgletscher / South East Greenland
Post by: Tor Bejnar on January 07, 2017, 05:38:00 PM
Where would we be without Espen?  I'm repeatedly grateful for you presence on these threads.

This calving broke up any consolidation/freezing-together of the debris (ice melange) floating in the fjord, so there isn't much winter left to form much of a buttress.  Given how active this glacier is, though, I'm not sure any buttress has been much of a deterrent to calving.  (From what I've read elsewhere, there appears to be different opinions as to how effective sea ice buttressing is for Greenland's glaciers.)
Title: Re: Helheim Gletscher / Fernisgletscher / South East Greenland
Post by: Espen on June 16, 2017, 10:27:49 PM
Helheim Gletscher update:

As you can see in the animation below, Helheim Gletscher is calving and retreating into new record lows:
Title: Re: Helheim Gletscher / Fernisgletscher / South East Greenland
Post by: Gary H on July 28, 2017, 02:23:57 AM
Here's an interesting look (from 2008, I believe) at a bit more history here.  A good bit of advance and retreat since 1933. If I'm seeing the picture here correctly, the June 15th terminus appears quite similar to that in 2005.
Title: Re: Helheim Gletscher / Fernisgletscher / South East Greenland
Post by: ghoti on July 28, 2017, 09:10:18 PM
Nasa Icebridge released this video today.

https://www.nasa.gov/feature/goddard/2017/two-decades-of-changes-in-helheim-glacier (https://www.nasa.gov/feature/goddard/2017/two-decades-of-changes-in-helheim-glacier)

Title: Re: Helheim Gletscher / Fernisgletscher / South East Greenland
Post by: oren on July 29, 2017, 12:57:13 AM
Thanks for the link ghoti, that is quite a video.
Title: Re: Helheim Gletscher / Fernisgletscher / South East Greenland
Post by: Espen on August 19, 2017, 09:33:11 AM
Heavy calving activity at Helheim Gletscher, and the glacier is now in a record retreat mode:
Title: Re: Helheim Gletscher / Fernisgletscher / South East Greenland
Post by: Gary H on August 20, 2017, 05:35:41 PM
As I noted above - curious that the terminus is back top approx where it was in 2005.
Title: Re: Helheim Gletscher / Fernisgletscher / South East Greenland
Post by: oren on August 20, 2017, 09:15:14 PM
As I noted above - curious that the terminus is back top approx where it was in 2005.
Thanks for that image. My eyes tell me that the glacier has now retreated beyond the 2005 line.
Title: Re: Helheim Gletscher / Fernisgletscher / South East Greenland
Post by: Gary H on August 21, 2017, 01:15:57 AM
Perhaps - perhaps not. Insignificant, in any event.  Study the other dates, on the graphic, for more eye work.

Besides - generally speaking, why would not one expect that the general trend would be downward, during  hundreds of years of GW? One knows that in the 350-450 yrs preceding that, the general trend was going the other way.
Title: Re: Helheim Gletscher / Fernisgletscher / South East Greenland
Post by: crandles on August 21, 2017, 12:34:37 PM
why would not one expect that the general trend would be downward, during  hundreds of years of GW? One knows that in the 350-450 yrs preceding that, the general trend was going the other way.

So why are you not expecting the trend to be downward ie thinner glacier and thinner glacier meaning less friction resistance so that the glacier can advance further until a point when it gets too thin and then starts an unstable retreat?
Title: Re: Helheim Gletscher / Fernisgletscher / South East Greenland
Post by: Gary H on August 21, 2017, 02:30:27 PM
I'd expect, that in start's and stops (as for the past century) I'd expect pretty much that to be the case, as long as GT's remain at the current level. Don't really need any additional GW, as we're warmer now than 150-200 yrs ago.  Not to sure what the 'unstable' implies -- Earth's climate doesn't invite long term stability; never has.
Title: Re: Helheim Gletscher / Fernisgletscher / South East Greenland
Post by: solartim27 on July 09, 2018, 05:01:19 PM
Large calving video from Jun 22
Live Science: Dramatic Video Captures Moment Towering Iceberg Splits from Greenland Glacier.
https://www.livescience.com/63008-greenland-glacier-births-iceberg-video.html
Title: Re: Helheim Gletscher / Fernisgletscher / South East Greenland
Post by: Shared Humanity on July 09, 2018, 08:10:51 PM
Large calving video from Jun 22
Live Science: Dramatic Video Captures Moment Towering Iceberg Splits from Greenland Glacier.
https://www.livescience.com/63008-greenland-glacier-births-iceberg-video.html

Nice.
Title: Re: Helheim Gletscher / Fernisgletscher / South East Greenland
Post by: Ktb on July 13, 2018, 07:50:09 PM
Helheim just calved a 10 billion ton iceberg.

https://www.nationalgeographic.com/environment/2018/07/glacier-ice-collapse-greenland/
Title: Re: Helheim Gletscher / Fernisgletscher / South East Greenland
Post by: solartim27 on July 14, 2018, 05:28:32 PM
Two nice videos in this Twitter thread
Simon Gascoin (@sgascoin) Tweeted:
Summer holiday activity: solving the Helheim iceberg puzzle from #Sentinel2 time lapse
More  by @themadstone @StefLhermitte here :  https://t.co/C7k5c0OaC8  #Greenland @CopernicusEU https://t.co/XLWY22fiZ5 https://twitter.com/sgascoin/status/1018140626628562944?s=17
Title: Re: Helheim Gletscher / Fernisgletscher / South East Greenland
Post by: georged on July 15, 2018, 10:08:14 AM
Helheim Gletscher update:

As you can see in the animation below, Helheim Gletscher is calving and retreating into new record lows:

It appears that the absolute record was in 2006.

https://twitter.com/sgascoin/status/1018140626628562944/photo/1
Title: Re: Helheim Gletscher / Fernisgletscher / South East Greenland
Post by: oren on July 15, 2018, 10:27:06 AM
That twitter animation is too quick and too low-red to properly assess, but I believe Espen's animation above shows record retreat on August 17th 2017, which seems to be a bit further than the 2006 retreat.
Title: Re: Helheim Gletscher / Fernisgletscher / South East Greenland
Post by: solartim27 on October 07, 2018, 08:35:02 PM
happened to have a break in the clouds, and looked out the window at just the right time to see the Helheim area on a recent trip.  I like to think the engine is consuming the ice.
Title: Re: Helheim Gletscher / Fernisgletscher / South East Greenland
Post by: Espen on August 15, 2019, 11:14:01 AM
Not only Helheim Gletscher is in record retreat mode but all glaciers in the entire area surrounding this great glacier are in the same sad condition, especially Franche-Comté Gletscher (which wrongly is also called Midgårdsgletscher at least until they were seperated), and to name a few others Fernisgletscher, Glacier de France, Knud Rasmussen Gletscher.
Notice the accumulation zone is almost gone in this animation:
Title: Re: Helheim Gletscher / Fernisgletscher / South East Greenland
Post by: Espen on August 18, 2019, 06:19:47 PM
A massive calving happened over the last 24 hours at Helheim Gletscher the action including a new record (satelite) retreat:
Title: Re: Helheim Gletscher / Fernisgletscher / South East Greenland
Post by: NotaDenier on August 19, 2019, 07:23:38 PM
CNN article regarding Helmheim and OMG research.

https://www.cnn.com/2019/08/19/weather/greenland-nasa-climate-battle-intl/?no-st=1566235266
Title: Re: Helheim Gletscher / Fernisgletscher / South East Greenland
Post by: sidd on October 02, 2019, 10:30:53 AM
This post could fit on many threads since it is directly related to ice collapse, but since the results are for Helheim, i post here.
There was a paper earlier this year by Parizek and many of the usual suspects:  doi: 10.1130/G45880.1

on the mechanics of calving at Helheim. It is a very good depiction of what actually happens: first there is a slump on the freeboard section, followed by a "falling upward" rotation of the submarine section that is no longer weighted down by the freeboard. I attach fig DR2 from the supplementary but i strongly recommend the whole paper. I shudder to think of this happening on Thwaites.

sidd

Title: Re: Helheim Gletscher / Fernisgletscher / South East Greenland
Post by: Espen on October 10, 2019, 12:31:48 PM
Helheim Gletscher not far away from record satellite retreat (August 17 2017), some would say overall record but not depthwise?
Title: Re: Helheim Gletscher / Fernisgletscher / South East Greenland
Post by: NotaDenier on October 12, 2019, 01:22:57 AM
Is helheim the most studied glacier in Greenland?
Great article.
https://vis.sciencemag.org/greenlands-dying-ice/
Title: Re: Helheim Gletscher / Fernisgletscher / South East Greenland
Post by: pietkuip on January 08, 2020, 08:58:43 PM
A poster (https://agu.confex.com/agu/fm19/meetingapp.cgi/Paper/494861) at the AGU conference in December by Sierra Melton, Richard B Alley, et al.
Quote
Iceberg Calving and Meltwater Plumes at Helheim Glacier, Visualized in High-Resolution Satellite Imagery

Abstract

Ice-cliff failure through calving of large icebergs may cause rapid retreat of outlet glaciers and destabilization of inland ice sheets. An improved understanding of calving mechanisms at ice cliffs is of critical importance to better constrain ice-sheet models and sea-level projections.

Helheim Glacier, a tidewater glacier on Greenland’s eastern coast, terminates in a ~100-m-tall ice cliff with an ice-mélange choked fjord in front. Icebergs calved at Helheim are primarily non-tabular bergs which, if extending the entire terminus thickness, generate globally-detectable glacial earthquakes during calving. Some wider tabular icebergs, which remain floating upright, also calve without producing such large glacial earthquakes.

An additional process occurring at Helheim’s calving front involves surface meltwater pooling and the appearance of meltwater-plume-fed polynyas in the mélange. The timing and locations of polynyas, subglacial drainage, calving behavior, and glacial earthquake occurrence are all associated processes that influence Helheim’s grounding state, yet limited observational data focusing on the linkages between these processes exists.

Here we utilize high-resolution DigitalGlobe optical imagery to observe temporal variability in iceberg morphology and meltwater features and compare these observations with the glacial earthquake record. Meltwater features often appear in consistent positions, suggesting that fjord geometry and the resulting glacier topography have a controlling influence on their spatial persistence. Surface pooling appears more extreme when no polynya is present, so these features are likely linked. Non-tabular iceberg calving and associated glacial earthquakes can occur even when no polynya is present, yet polynya appearance suggests a channelized subglacial drainage system and hence indicates a grounded or near-grounded front.

These targeted observations will inform more generalized modeling of ice-cliff retreat, as Helheim’s terminus behavior may serve as an analogue to processes at the future glacial margins of Antarctica after removal of ice shelves by warming ocean waters. Unstable ice cliffs could cause retreat into the deep Antarctic basins containing vast volumes of ice with the potential to contribute several meters to global sea level.

Two frames from the poster are displayed here as png.