Author Topic: Jakobshavn Isbræ / Ilulissat Isfjord / West Greenland (Read 1256719 times)

werther · « **Reply #100 on:** April 15, 2013, 12:05:38 AM »

Thanks Yuha!
And confirmed; about 1,2 km2 on the NE side of the main calving front.
Still more than 9 km2 to go to get beyond July '12.
Making exceptional progress this early in spring!
The front is close to losing contact with the sill again. A lot might go in a bang soon (June?).

werther · « **Reply #101 on:** April 15, 2013, 12:07:51 PM »

Weather? Sure, but in concert with extreme negative anomaly.
This is daytime max at Kangerlussuaq. The warm event lasted from 1 to 11 April:

For this decade nothing alike to be found back to 2006.
MODIS shows snow cover most hit near the icesheet boundary. On the coast the effect was smaller.
It is not of ‘climate-consequence’… a minor, regional event. But if this is capable of producing about 2 km3 calving on Sermeq Kujalleq this early in the season, lets hope June/July doesn’t show comparable circumstances.
BTW weather is in for a decade of freeze over there now. Circulation changed…

werther · « **Reply #102 on:** April 15, 2013, 01:18:26 PM »

"...extreme negative anomaly...", confusing.... I meant ...extreme negative AO anomaly... But I guess you would have noticed.

Neven · « **Reply #103 on:** April 15, 2013, 01:32:38 PM »

Quote from: werther on April 15, 2013, 12:07:51 PM

BTW weather is in for a decade of freeze over there now. Circulation changed…

You mean because of the Cold Pole that shifted over Greenland?

werther · « **Reply #104 on:** April 15, 2013, 02:15:05 PM »

Quote

You mean because of the Cold Pole that shifted over Greenland?

Well, I hope no Turkey with that adjective...

Neven, since I gather 10-day NCEP/NCAR summaries, I call these decades. I guess that's confusing...I don't mean years.

No, ECMWF shows mostly N/NE winds over Central and West Greenland up to 25/4. No new snow that could help albedo in the coming months. But also a stop to whatever surface melt happened between 1-11 April.

Neven · « **Reply #105 on:** April 15, 2013, 02:46:22 PM »

Quote from: werther on April 15, 2013, 02:15:05 PM

Neven, since I gather 10-day NCEP/NCAR summaries, I call these decades. I guess that's confusing...I don't mean years.

Right, got it!

BTW, it's because of threads like this one that I'm so happy with the forum!

Yuha · « **Reply #106 on:** April 24, 2013, 01:27:54 AM »

Quote from: werther on April 15, 2013, 12:05:38 AM

And confirmed; about 1,2 km2 on the NE side of the main calving front.
Still more than 9 km2 to go to get beyond July '12.

Another 1 or 2 km² gone, I think.
Compare April 14 and 23.

CraigsIsland · « **Reply #107 on:** April 24, 2013, 02:32:00 AM »

Money is on calving past July '12

Anne · « **Reply #108 on:** April 27, 2013, 11:15:08 AM »

A lot of ice in the bay this morning
http://www.hotelarctic.com/om_hotel_arctic/webcam/

Espen · « **Reply #109 on:** April 30, 2013, 08:19:32 PM »

A 1 mm movement today, southern front!

CraigsIsland · « **Reply #110 on:** April 30, 2013, 09:59:30 PM »

Quote from: Espen on April 30, 2013, 08:19:32 PM

A 1 mm movement today, southern front!

One millimeter or one kilometer?

Espen · « **Reply #111 on:** April 30, 2013, 10:02:50 PM »

1 mm represents 1 km at Modis 250M

CraigsIsland · « **Reply #112 on:** May 01, 2013, 03:16:44 AM »

Quote from: Espen on April 30, 2013, 10:02:50 PM

1 mm represents 1 km at Modis 250M

ah - Thank you!

that's a large movement. And its about to be May.

Espen · « **Reply #113 on:** May 03, 2013, 07:34:41 PM »

When the calving is over this will be the result:

sidd · « **Reply #114 on:** May 04, 2013, 07:49:08 AM »

Please, where did you get this old map ? I showed this to a friend, and she immediately began to trace the place names, and wanted to know the source so she could do research. Any leads would be greatly appreciated.

Thanx,

sidd

Espen · « **Reply #115 on:** May 04, 2013, 10:52:20 AM »

Sidd;

It is from a place names report of Anthony Higgins: Exploration history and place names of northern East Greenland. Bulletin 21 2012.

sidd · « **Reply #116 on:** May 05, 2013, 12:17:28 AM »

Thanx so much.

sidd

Espen · « **Reply #117 on:** May 05, 2013, 12:26:46 AM »

sidd;

But be aware some of the names may be be too political Denmark vs Norway, and not be valid now!

ivica · « **Reply #118 on:** May 09, 2013, 12:46:45 PM »

What happened to Web cam at Hotel Arctic?
A raven with digestive problem?

theoldinsane · « **Reply #119 on:** May 09, 2013, 06:02:24 PM »

Quote

What happened to Web cam at Hotel Arctic?
A raven with digestive problem?

It was a meteroite

http://theoldinsane.blogspot.se/2013/05/fv9-breaking-news-meteroitnedslag-i.html

birthmark · « **Reply #120 on:** May 09, 2013, 06:45:51 PM »

Maybe, but the doom predicted on that webpage is far-fetched. Frankly, I think it's a hoax.

ivica · « **Reply #121 on:** May 09, 2013, 07:26:24 PM »

Folks, I saw those "trails" yesterday, around 6 PM UTC.
The "trails" were on webcam photos this morning too, hence my post.
A raven is still my suspect

Edit: 6 PM, not 6 AM, eh.

Laurent · « **Reply #122 on:** May 29, 2013, 11:14:04 AM »

At that pace the ice sheet wil join the front of the glacier very soon !

Espen · « **Reply #123 on:** June 08, 2013, 08:20:16 PM »

The Icefjord is getting emptied:

http://rapidfire.sci.gsfc.nasa.gov/cgi-bin/imagery/single.cgi?image=crefl2_143.A2013159152000-2013159152500.250m.jpg

CraigsIsland · « **Reply #124 on:** June 10, 2013, 02:16:47 AM »

Good eyes out there

should be a remarkable melt season in Greenland this year; already shaping up to be that way.

http://nsidc.org/greenland-today/

CraigsIsland · « **Reply #125 on:** June 11, 2013, 09:14:15 PM »

I was wondering if I'm seeing this image right - are those melt pond features up and down near the edge of the sheet?

http://lance-modis.eosdis.nasa.gov/imagery/subsets/?subset=Arctic_r02c02.2013162.terra.250m

Laurent · « **Reply #126 on:** June 11, 2013, 09:45:49 PM »

I do think it is !
There was more last year around the Jakobson glacier !

Yuha · « **Reply #127 on:** June 13, 2013, 06:57:29 PM »

Disko Bay surface waters have warmed up dramatically in the last few days:

http://ocean.dmi.dk/arctic/images/MODIS/Disko/201306050000.MERT.png
http://ocean.dmi.dk/arctic/images/MODIS/Disko/201306130000.MERT.png

CraigsIsland · « **Reply #128 on:** June 13, 2013, 07:50:29 PM »

Forecast temperatures for Ilulisat for 10C+ (50F) for Saturday through Monday:

http://www.dmi.dk/dmi/en/byvejr_gl?by=4221

also SST anamolies for Disko Bay

and SST for Disko Bay

Laurent · « **Reply #129 on:** June 16, 2013, 10:53:15 PM »

Some move between the day 157 and 167 (juin 16 2013)
More melt ponds appearing very quickly !

DaddyBFree · « **Reply #130 on:** July 13, 2013, 04:20:14 PM »

And the calving continues...

http://www.screencast.com/t/8utijiH9J38M

KactionJ · « **Reply #131 on:** July 15, 2013, 09:28:09 PM »

Quote from: mspelto 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? $:-\$

Make sure you are looking at the calving front (the butt shape at the start of the fjord). You won't see the icebergs as the entire fjord is pretty much full of them right now.

The look at the bottom half circle of the calving front. It is much more elongated in the later picture. That retreat is what they are talking about.

Espen · « **Reply #132 on:** July 16, 2013, 10:10:47 AM »

I also noticed the other day, a change in the southern calving front.

Laurent · « **Reply #133 on:** July 16, 2013, 01:41:25 PM »

Between day 161 and yesterday 196

Yuha · « **Reply #134 on:** July 19, 2013, 10:39:43 PM »

Another big calving (compare days 196 and 200).

The calving front has now retreated beyond last year's position, I think.

Werther, does your CAD agree?

Espen · « **Reply #135 on:** July 20, 2013, 09:29:42 AM »

Comparing Sep. 2012 and July 19 2013, I believe we are back at square 1?

Laurent · « **Reply #136 on:** July 24, 2013, 11:03:12 AM »

Between 196 and 204

ivica · « **Reply #137 on:** July 24, 2013, 11:24:32 AM »

Laurent, thanks, your animation also makes apparent how some melt ponds increases area/volume.

werther · « **Reply #138 on:** July 24, 2013, 01:45:32 PM »

Quote from: Yuha on July 19, 2013, 10:39:43 PM

Another big calving (compare days 196 and 200).

The calving front has now retreated beyond last year's position, I think.

Werther, does your CAD agree?

Hi Yuha,

Thanks for waking me up, likewise credit to Laurent and Espen et al.
haven't been following this close. Ongoing impression that this year is not an exceptional melt year for Greenland. At least, the SW coast. Might be different in the NE.

But I've given MODIS r02c02 some glances. Think you're right; calving is on it's way to get past 2012. Still, I think it is a regular calving and has little connection with melt patterns in the ablation zone. The landscape around 1100-1200 m seems quiet this period.

Later in the season I'll give it a shot on CAD, when the sea ice chase has passed its yearly hype moment.

Sigmetnow · « **Reply #139 on:** July 27, 2013, 04:47:20 PM »

Rolling Stone has a great article on Jason Box -- will also post this here, since a good chunk of the article concerns his start of the Dark Snow project on Jakobshavn glacier.

http://www.rollingstone.com/greenland-melting#ixzz2aFyKZV2F

Lennart van der Linde · « **Reply #140 on:** August 01, 2013, 12:00:48 PM »

Upthread the question came up if the glacier trough extends all the way inland into the interior of the ice sheet. This recent paper by Bamber et al gives sort of an answer:
http://www.the-cryosphere.net/7/499/2013/tc-7-499-2013.pdf

On pp.506-507 they say:
“In the Jakobshavn catchment, there is a dendritic channel system extending for about 325 km from the current grounding line into the interior almost as far as the ice divide. It seems likely that this is a palaeo-fluvial feature that predates ice cover in Greenland and may be important for subglacial water routing… The width of the trough is 3–4 km and the region of fastest flow coincides fairly well with the location of the deepest ice. The trough is 1366m below sea level at its deepest point compared to a maximum depth over the entire region of 556m below sea level in the older dataset. The main trough of Jakobshavn Isbrae is not continuous in the new dataset, disappearing around 100 km and reappearing at about 140 km. This does not imply that the trough is discontinuous, but only that there are insufficient data to confirm the trough’s presence or otherwise in this region.”

So maybe warming ocean water could in time eats it way into the interior bottom of the ice sheet?

Laurent · « **Reply #141 on:** August 03, 2013, 10:01:02 PM »

Few changes (apparently, lot of ice going in holyday to the sea) on the front of the Glacier but a lot of move inland. (You have to click on the picture).
Difference between day 204 and 215 !

Espen · « **Reply #142 on:** August 28, 2013, 01:09:24 PM »

A prelim of Jakobshavn:

Laurent · « **Reply #143 on:** August 30, 2013, 02:41:43 PM »

Bedrock map of Jakobshavn :
I did put an arrow where I guess the front of the glacier is, or is it where the sea is viewed !?

You can click on the image to enlarge it !

Espen · « **Reply #144 on:** August 30, 2013, 02:49:26 PM »

Laurent where do you get those area bedrock maps from, are they available for all of Greenland Eg North Greenland and North East Greenland?

Laurent · « **Reply #145 on:** August 30, 2013, 02:54:18 PM »

I did put the links here ?
https://forum.arctic-sea-ice.net/index.php/topic,270.msg14150.html#msg14150

Espen · « **Reply #146 on:** August 30, 2013, 02:58:04 PM »

Quote from: Laurent on August 30, 2013, 02:54:18 PM

I did put the links here ?
https://forum.arctic-sea-ice.net/index.php/topic,270.msg14150.html#msg14150

Yes I know, but I dont see that Jakobshavn part there?

Laurent · « **Reply #147 on:** August 30, 2013, 04:57:46 PM »

This is the link :
http://svs.gsfc.nasa.gov/vis/a000000/a004000/a004097/
The image with jakobshavn is after this image, I took the highest resolution and did a crop on it + jpg high compression :

Espen · « **Reply #148 on:** August 30, 2013, 05:00:17 PM »

Quote from: Laurent on August 30, 2013, 04:57:46 PM

This is the link :
http://svs.gsfc.nasa.gov/vis/a000000/a004000/a004097/
The image with jakobshavn is after this image, I took the highest resolution and did a crop on it + jpg high compression :

Laurent, I see, that wont help me though

Laurent · « **Reply #149 on:** August 30, 2013, 05:04:28 PM »

Why don't you ask them !? May be they would gladly give you some other views ? Even better a 3D map of greenland high resolution ?

News:

Author Topic: Jakobshavn Isbræ / Ilulissat Isfjord / West Greenland (Read 1256719 times)