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Author Topic: Jakobshavn Isbræ / Ilulissat Isfjord / West Greenland  (Read 558481 times)

Espen

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Jakobshavn Isbræ / Ilulissat Isfjord / West Greenland
« on: March 23, 2013, 09:43:36 PM »
Reposted from Arctic Sea Ice Blog;

Jakobshavn Isbræ/Sermeq Kujalleq;

The whole coast north and south of Ilulissat Icefjord, is almost without snowcover and the "ice"fjord is nearly free of ice debris from the glacier, the blue ice color up the "hills" from the coastline, indicating start of melting:

http://rapidfire.sci.gsfc.nasa.gov/imagery/subsets/?subset=Arctic_r02c02.2013082.aqua
« Last Edit: August 23, 2015, 06:58:31 PM by Espen »
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Neven

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Re: Jakobshavn Isbræ/Sermeq Kujalleq/Ilulissat Icefjord
« Reply #1 on: March 23, 2013, 09:54:58 PM »
I've written about a similar event in April 2011 for the ASIB: Flushing out the Fjord.
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Espen

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Re: Jakobshavn Isbræ/Sermeq Kujalleq/Ilulissat Icefjord
« Reply #2 on: March 23, 2013, 10:02:16 PM »
Neven;

I am aware of that, but this year hardly no snow cover  in the area, and the blue ice indicating melting.
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icebgone

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Re: Jakobshavn Isbræ/Sermeq Kujalleq/Ilulissat Icefjord
« Reply #3 on: March 23, 2013, 10:05:47 PM »
Espen:  SST and air temps have both been way above average.  Has this happened this early before?  I seem to remember a similar melting in April but never March.  If air temps return to long term average beginning late next week I expect a thin film of ice to cover the open water for a short time but glacier melting looks to be large this year irregardless. 

Neven

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Re: Jakobshavn Isbræ/Sermeq Kujalleq/Ilulissat Icefjord
« Reply #4 on: March 23, 2013, 10:12:06 PM »
Neven;

I am aware of that, but this year hardly no snow cover  in the area, and the blue ice indicating melting.

I didn't mean it as a 'been there, done that', just to link to some extra info. I will possibly blog about this in a week or so. Or two.

Like icebgone says: Temps in Baffin Bay have been anomalously warm almost all winter long, so this part of Greenland will be a thing to watch. I think a repeat of last year is a definite possibility.
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Espen

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Re: Jakobshavn Isbræ/Sermeq Kujalleq/Ilulissat Icefjord
« Reply #5 on: March 23, 2013, 10:31:15 PM »
Neven;

I have the feeling this season will be very busy, and there will be a lot of places to watch!? :)
Have a ice day!

Espen

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Re: Jakobshavn Isbræ/Sermeq Kujalleq/Ilulissat Icefjord
« Reply #6 on: March 23, 2013, 10:50:12 PM »
Espen:   Has this happened this early before?  I seem to remember a similar melting in April but never March. 

IceBgone;

I am not sure about how unusual these March temperatures are, but I went true Modis, and I did not find any images indicating this low level of snow cover in March?
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Espen

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Re: Jakobshavn Isbræ/Sermeq Kujalleq/Ilulissat Icefjord
« Reply #7 on: March 25, 2013, 05:46:18 PM »
Spring cleaning Ilulissat Icefjord;

A big of piece of ice that was resting on the southern shore is on the move:

http://rapidfire.sci.gsfc.nasa.gov/cgi-bin/imagery/single.cgi?image=crefl2_143.A2013084154000-2013084154500.250m.jpg

« Last Edit: March 25, 2013, 07:39:25 PM by Espen »
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CraigsIsland

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Re: Jakobshavn Isbræ/Sermeq Kujalleq/Ilulissat Icefjord
« Reply #8 on: March 25, 2013, 07:24:27 PM »
Google Maps seems to have recent satellite images at: https://maps.google.com/maps?ll=69.166667,-49.833333&spn=0.2,0.2&t=h&q=69.166667,-49.833333https://maps.google.com/maps?ll=69.166667,-49.833333&spn=0.2,0.2&t=h&q=69.166667,-49.833333

Bottom left tells me 2013 is when the images were captured. If so- amazing amount of darker densities. I don't know much about this glacier but that looks like a massive outlet into the sea.

gfwellman

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Re: Jakobshavn Isbræ/Sermeq Kujalleq/Ilulissat Icefjord
« Reply #9 on: March 25, 2013, 07:32:17 PM »
Nah, that looks like last summer.

ivica

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Re: Jakobshavn Isbræ/Sermeq Kujalleq/Ilulissat Icefjord
« Reply #10 on: March 25, 2013, 07:54:32 PM »
Spring cleaning Ilulissat Icefjord;
A big of piece of ice that was resting on the southern shore is on the move:...

To make that easier for novices I did this image of JIS area using EOSDIS WorldView,
attached:

ivica

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Re: Jakobshavn Isbræ/Sermeq Kujalleq/Ilulissat Icefjord
« Reply #11 on: March 25, 2013, 08:17:43 PM »
Map of JIS area, cropped from image given here
https://forum.arctic-sea-ice.net/index.php/topic,143.msg2009.html#msg2009

Map Attached:

Espen

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Re: Jakobshavn Isbræ/Sermeq Kujalleq/Ilulissat Icefjord
« Reply #12 on: March 25, 2013, 08:41:59 PM »
Thanks ivica!
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Espen

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Re: Jakobshavn Isbræ/Sermeq Kujalleq/Ilulissat Icefjord
« Reply #13 on: March 25, 2013, 09:06:52 PM »
After a few more studies, I found there was some calving activity between day 80 and 84 (today) from the Glacier/Bræ as well.
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Laurent

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Re: Jakobshavn Isbræ/Sermeq Kujalleq/Ilulissat Icefjord
« Reply #14 on: March 25, 2013, 09:28:51 PM »
The ice cover is disappearing very fast in front of what remains of the glacier!
Does somebody know if there is some studies about what is going on below the glacier ! How far does the internal sea of Greenland is from the front of Jakobshavn ?
Thanks !

Espen

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Re: Jakobshavn Isbræ/Sermeq Kujalleq/Ilulissat Icefjord
« Reply #15 on: March 26, 2013, 12:15:55 PM »
A-Team;

May we could ask you to create an animation from Modis, where the calving and cleaning is shown .
It is from day 80 to 84?
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Espen

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Re: Jakobshavn Isbræ/Sermeq Kujalleq/Ilulissat Icefjord
« Reply #16 on: March 26, 2013, 01:38:27 PM »
Have a ice day!

Sigmetnow

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Re: Jakobshavn Isbræ/Sermeq Kujalleq/Ilulissat Icefjord
« Reply #17 on: March 26, 2013, 03:39:03 PM »
Thanks, A-Team!

The animation also shows how quickly the ice is moving down Baffin Bay.

(Hint.)  :D
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CraigsIsland

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Re: Jakobshavn Isbræ/Sermeq Kujalleq/Ilulissat Icefjord
« Reply #18 on: March 26, 2013, 05:55:39 PM »
Great focal point on one location: disco bay. http://ocean.dmi.dk/arctic/disko.uk.php


I haven't had time animate some time periods, but just gazing through the past 1-2 weeks and other years plus other seasons shows a pretty significant change.. Looks like there is a weak shelf too

ivica

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Re: Jakobshavn Isbræ/Sermeq Kujalleq/Ilulissat Icefjord
« Reply #19 on: March 26, 2013, 06:20:13 PM »
Could be handy during JIS area melting season,
Weather forecast/statistic for Ilulissat from 2 sources:

     yr.no   (notice web cam at Hotel Arctic, Ilulissat)

     wunderground.com
« Last Edit: March 26, 2013, 06:45:08 PM by ivica »

Espen

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Re: Jakobshavn Isbræ/Sermeq Kujalleq/Ilulissat Icefjord
« Reply #20 on: March 26, 2013, 06:29:05 PM »
And we need some animators (gif/png/jpg) because there will be a lot to do, and we cant depend on A-Team alone.
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ivica

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Re: Jakobshavn Isbræ/Sermeq Kujalleq/Ilulissat Icefjord
« Reply #21 on: March 26, 2013, 06:46:48 PM »
Web cam at Hotel Arctic, Ilulissat,  updates every five minutes:


(click on photo to zoom)

Hotel location can be found on map here, search for number 23 (up-middle).
« Last Edit: March 26, 2013, 07:50:51 PM by ivica »

Sigmetnow

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Re: Jakobshavn Isbræ/Sermeq Kujalleq/Ilulissat Icefjord
« Reply #22 on: March 26, 2013, 07:57:36 PM »
Espen,

I’m willing to make some animations -- but having never done so, I could use some instructions / helpful hints.  I had previously bookmarked the toolson.net/GifAnimation site, so I will try playing with that, and see if things crash miserably....
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Espen

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Re: Jakobshavn Isbræ/Sermeq Kujalleq/Ilulissat Icefjord
« Reply #23 on: March 26, 2013, 08:51:36 PM »
Hi Sigmetnow;

Just try to get used to some of the many gif/png/jpg animators on the net, and of course a nice image editor eg. Photoshop / Gimp etc.
Then you are on the road!
Have a ice day!

Laurent

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Re: Jakobshavn Isbræ/Sermeq Kujalleq/Ilulissat Icefjord
« Reply #24 on: March 26, 2013, 09:14:04 PM »
Just watch this video, it may help to make a gif !
How to Create an Animated GIF With GIMP

If your are using linux ubuntu/debian it is in the library !

Sigmetnow

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Re: Jakobshavn Isbræ/Sermeq Kujalleq/Ilulissat Icefjord
« Reply #25 on: March 27, 2013, 01:05:34 AM »
I believe I have GIMP’d successfully!

This should be an animation of the 8 days of Navy Ice Thickness, 3/23 to 3/30/2013, showing their forecast of thinning ice (less black ice, and red is changing to yellow).  I have cropped the images to only show the main ice pack.

Fingers crossed!

Thanks, Laurent!
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Sigmetnow

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Re: Jakobshavn Isbræ/Sermeq Kujalleq/Ilulissat Icefjord
« Reply #26 on: March 27, 2013, 01:07:13 AM »
Happy Dance! ;D ;D ;D
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Espen

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Re: Jakobshavn Isbræ/Sermeq Kujalleq/Ilulissat Icefjord
« Reply #27 on: March 27, 2013, 08:31:54 AM »
Sigmetnow;

Looks good, how about a close up and cropped Modis 250 m of Ilulissat Icefjord from day 79  to 84?
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Laurent

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Re: Jakobshavn Isbræ/Sermeq Kujalleq/Ilulissat Icefjord
« Reply #28 on: March 27, 2013, 09:14:05 AM »
It seems that arctic.io has got something much more powerful !
https://forum.arctic-sea-ice.net/index.php/topic,165.0/topicseen.html
Still in the linux library !
I do not know what does it give ! If you want to try !

ivica

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Re: Jakobshavn Isbræ/Sermeq Kujalleq/Ilulissat Icefjord
« Reply #29 on: March 27, 2013, 09:41:50 AM »
More links:
National newspaper Sermitsiaq

One more webcam at Illulisat Pitoqqeq, page contains some videos too.
Unfortunately webcam seems to be down since March, 20.

Sigmetnow

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Re: Jakobshavn Isbræ/Sermeq Kujalleq/Ilulissat Icefjord
« Reply #30 on: March 27, 2013, 03:37:48 PM »
Espen,

Challenge accepted!  Here is March 20 to March 25, 2013.  (Still figuring out how to apply text to an image.)

What’s a good file size/limit for these things?
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Espen

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Re: Jakobshavn Isbræ/Sermeq Kujalleq/Ilulissat Icefjord
« Reply #31 on: March 27, 2013, 04:24:08 PM »
Sigmetnow;

Nice work! If using Photoshop or many other image editors it is pretty easy, use the text tool in each frame, but I dont know what editor you are using?
But I sure we can make use of your talent in "our" documentation department.

Back to the animation, you can easily see a lot ice was moved away in those few days. When we get into the real melting season there will be many more actions both here and other glaciers as well as sea ice movements.

Size is perfect for this event, and the "weight" 5 -600 kb is fine nowadays, but more frames more "weight"!


« Last Edit: March 27, 2013, 04:35:57 PM by Espen »
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Sigmetnow

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Re: Jakobshavn Isbræ/Sermeq Kujalleq/Ilulissat Icefjord
« Reply #32 on: March 27, 2013, 05:11:13 PM »
Thanks, Espen.
I'm using GIMP for Mac.  I managed to add text -- but now it's saying it won't export as .gif unless I "convert to index color or greyscale first."  I attempted to create an image palette and use one of those values for the text, but still no joy.   Any ideas?

Hmmm... I wonder if "flattening" each text-and-image layer-pair would work?  If so, I need to figure out how to do that for each layer-group.  Will try again later.
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Espen

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Re: Jakobshavn Isbræ/Sermeq Kujalleq/Ilulissat Icefjord
« Reply #33 on: March 27, 2013, 05:17:34 PM »
Sigmetnow,

As I recall, the text is in a layer, so you got to flatten the image, I am pretty sure that will work!
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silkman

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Re: Jakobshavn Isbræ/Sermeq Kujalleq/Ilulissat Icefjord
« Reply #34 on: March 27, 2013, 06:35:28 PM »
Daily animations from Ilulissat isbrae:

http://sermitsiaq.ag/icecam/

Phil.

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Re: Jakobshavn Isbræ/Sermeq Kujalleq/Ilulissat Icefjord
« Reply #35 on: March 27, 2013, 07:06:10 PM »
Sigmetnow,

As I recall, the text is in a layer, so you got to flatten the image, I am pretty sure that will work!

Yes you need to flatten with Photoshop.

TerryM

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Re: Jakobshavn Isbræ/Sermeq Kujalleq/Ilulissat Icefjord
« Reply #36 on: March 27, 2013, 07:31:44 PM »
Daily animations from Ilulissat isbrae:

http://sermitsiaq.ag/icecam/



Wonderful link


Thanks
Terry

Sigmetnow

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Re: Jakobshavn Isbræ/Sermeq Kujalleq/Ilulissat Icefjord
« Reply #37 on: March 27, 2013, 08:22:59 PM »
Espen and Phil,

Found it!  In GIMP, to flatten each text to its image, click on their Group in the Layer window, and in the Layer menu use:  "Merge Layer Group".  The file exported fine after that.
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HeisenIceBerg

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Re: Jakobshavn Isbræ/Sermeq Kujalleq/Ilulissat Icefjord
« Reply #38 on: March 31, 2013, 07:03:01 AM »
There appears to have been a rather large calving event in the past few days.  The piece can first be seen breaking off on Mar 28th; it is roughly triangular with side lengths of approximately 6km each, based on images and the scale from http://earthdata.nasa.gov/labs/worldview/.  On Mar 29th and 30th, it can be seen disintegrating, filling much of the bay with the pieces.  Based the way it has disintegrated, I would be surprised if it was just sea ice, but please correct me if it is.

Original images from LANCE-MODIS Terra:
http://lance-modis.eosdis.nasa.gov/imagery/subsets/?subset=Arctic_r02c02.2013086.terra.250m
http://lance-modis.eosdis.nasa.gov/imagery/subsets/?subset=Arctic_r02c02.2013087.terra.250m
http://lance-modis.eosdis.nasa.gov/imagery/subsets/?subset=Arctic_r02c02.2013088.terra.250m
http://lance-modis.eosdis.nasa.gov/imagery/subsets/?subset=Arctic_r02c02.2013089.terra.250m
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gfwellman

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Re: Jakobshavn Isbræ/Sermeq Kujalleq/Ilulissat Icefjord
« Reply #39 on: March 31, 2013, 08:02:03 AM »
You're absolutely right that that was a glacial 'berg, but technically wrong about it being a calving event.  The actual calving front is that double curve just east of the exposed mountains.  All the ice between there and the open water is already calved, but kinda jammed in place.  Probably a lot of grounded bergs anchoring the mass in place.  So the event you gave us such nice pictures of would probably better be described as a large berg getting free of the stuck area.  Probably involved a giant roll-over event that would be almost as exciting as an actual calving anyway.  And then it broke up as you say.

Neven

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Re: Jakobshavn Isbræ/Sermeq Kujalleq/Ilulissat Icefjord
« Reply #40 on: March 31, 2013, 11:28:47 PM »
Nice images, HIB!
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Re: Jakobshavn Isbræ/Sermeq Kujalleq/Ilulissat Icefjord
« Reply #41 on: April 06, 2013, 01:17:10 PM »
I noted in another post that Ice Bridge flew the glacier on April 4-5. There are a couple of photos from that day attached.

https://forum.arctic-sea-ice.net/index.php/topic,3.50.html


Apocalypse4Real

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Re: Jakobshavn Isbræ/Sermeq Kujalleq/Ilulissat Icefjord
« Reply #42 on: April 06, 2013, 01:26:07 PM »
Here is the IceBridge link to the NASA flight. It includes a video posting.

http://www.nasa.gov/mission_pages/icebridge/index.html


Neven

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Re: Jakobshavn Isbræ/Sermeq Kujalleq/Ilulissat Icefjord
« Reply #43 on: April 06, 2013, 02:35:44 PM »
Cool video!  :)
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Espen

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Re: Jakobshavn Isbræ/Sermeq Kujalleq/Ilulissat Icefjord
« Reply #44 on: April 06, 2013, 06:54:33 PM »
Only a week or so the Fjord was empty, now it is already full of ice from the Bræ!

http://rapidfire.sci.gsfc.nasa.gov/imagery/subsets/?subset=Arctic_r02c02.2013096.terra.250m
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icebgone

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Re: Jakobshavn Isbræ/Sermeq Kujalleq/Ilulissat Icefjord
« Reply #45 on: April 07, 2013, 12:48:16 AM »
Any plans to measure glacier forward momentum so comparison to prior years is possible?  Also height of melting between years?

Yuha

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Re: Jakobshavn Isbræ/Sermeq Kujalleq/Ilulissat Icefjord
« Reply #46 on: April 07, 2013, 09:45:14 AM »
The calving front is visibly retreating as seen by comparing terra images from days 94 and 96:

http://rapidfire.sci.gsfc.nasa.gov/imagery/subsets/?subset=Arctic_r02c02.2013094.terra.250m
http://rapidfire.sci.gsfc.nasa.gov/imagery/subsets/?subset=Arctic_r02c02.2013096.terra.250m

It's best to compare even days to even days as there is some strange distortion between odd and even days.

Neven

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Re: Jakobshavn Isbræ/Sermeq Kujalleq/Ilulissat Icefjord
« Reply #47 on: April 07, 2013, 10:19:38 AM »
Wow, well-spotted, Yuha.
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Espen

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Re: Jakobshavn Isbræ/Sermeq Kujalleq/Ilulissat Icefjord
« Reply #48 on: April 07, 2013, 11:02:05 AM »
Yaha;

Well spotted, and it must have been a big one, it looks like a 1 km movement!
Have a ice day!

mspelto

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Re: Jakobshavn Isbræ/Sermeq Kujalleq/Ilulissat Icefjord
« Reply #49 on: April 07, 2013, 01:51:14 PM »
 I do not see this 1 km, change, nor do I see the icebergs that should have been generated by such a change.  What am I missing? :-\