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Author Topic: Jakobshavn Isbræ / Ilulissat Isfjord / West Greenland  (Read 758852 times)

prokaryotes

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Re: Jakobshavn Isbræ / Ilulissat Isfjord / West Greenland
« Reply #2100 on: June 20, 2019, 04:32:21 PM »
An interesting article on the OMG project from the Nasa Earth Observatory.

Turns out the glacier is getting thicker...
My guess...

This anomaly, the Cold blob (North Atlantic) https://en.wikipedia.org/wiki/Cold_blob_(North_Atlantic) … It appears possibly related to global warming-induced melting of the Greenland ice sheet. Which suggest that at least it has a slight negative feedback on marine terminating glaciers. https://twitter.com/climatestate/status/1141083224074084353
CLIMATE STATE WEBSITE | YOUTUBE | USCREEN

Alphabet Hotel

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Alphabet Hotel

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Re: Jakobshavn Isbræ / Ilulissat Isfjord / West Greenland
« Reply #2102 on: July 01, 2019, 06:04:42 AM »
Another calving event between June 26 and June 29. Click to play.

Alphabet Hotel

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Re: Jakobshavn Isbræ / Ilulissat Isfjord / West Greenland
« Reply #2103 on: July 04, 2019, 03:32:03 AM »
Large calving between June 30 and July 3. Because the June 29 and June 30 images were obscured by clouds and the previous event was fairly minor, I combined them in this video, which shows the difference between June 26 and July 3.

johnm33

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Re: Jakobshavn Isbræ / Ilulissat Isfjord / West Greenland
« Reply #2104 on: July 04, 2019, 10:23:38 AM »
I woke up thinking about my contrary view of whats happening here, so in this image , which expands with a click, there's a cill at A0 which is about 700m bsl and I'm guessing would sustain an ice wall at 700/9 so 80m/270ft above sea level +/- whatever crushing load and resistance to it the ice brings. At the bend of the southern branch the trough reaches 1400m deep so if bouyant the ice would sustain 160m/540ft of ice +/- same variables. Moving towards the now calving front those variables would be expressed, and where it meets the rising ground the glacier would break as a wave front more or less at the yellow line just as a wave breaks onto a shore. I'm suggesting that the increasing depth of the ice at the calving front indicates that the base has melted out beneath it and further that once that depth reaches equilibrium then the energy that has gone into melting the deep ice will spread not just upstream but sideways into the ice sheet. It may be a good idea to watch for developing wave forms downstream of the deepest parts of the trough.

Barthol

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Re: Jakobshavn Isbræ / Ilulissat Isfjord / West Greenland
« Reply #2105 on: July 05, 2019, 03:16:42 AM »
Another calving event happened between july 3 and july 4.
I wonder what the final retreat will be at the end of the melting season.


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Re: Jakobshavn Isbræ / Ilulissat Isfjord / West Greenland
« Reply #2106 on: July 06, 2019, 01:33:49 AM »
Another calving event happened between july 3 and july 4.
I wonder what the final retreat will be at the end of the melting season.

I didn't have time to make an animation, but here are the raw images.

Barthol

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Re: Jakobshavn Isbræ / Ilulissat Isfjord / West Greenland
« Reply #2107 on: July 06, 2019, 02:23:44 AM »
Another calving event happened between july 3 and july 4.
I wonder what the final retreat will be at the end of the melting season.

I didn't have time to make an animation, but here are the raw images.
I made a an animation of the raw images that you provided.
And I see the same when i tried it yesterday.
The calving event is obvious, but... besides that it looks as if the whole image is shifting a littlebit.
Everything moves a littlebit, Also the bare rocks.

Dietrich

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Re: Jakobshavn Isbræ / Ilulissat Isfjord / West Greenland
« Reply #2108 on: July 09, 2019, 07:31:21 PM »
Looking at Sentinel image from yesterday, Natural color, I was struck by the darkness of the ice surface of the basin around Jakobshavn.   Took a look at prior years for the same date and it's much darker this year for this date.  Cryokinite (sp?)must be going nuts.   Is anybody aware of a resource tracking albedo year over year?  Sentinel doesn't go back to 2012 and it would interesting to compare that standout year.
Thoughts on this darkening impacting melt ponds > Moulins > Glacier speed / Calving?

oren

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Re: Jakobshavn Isbræ / Ilulissat Isfjord / West Greenland
« Reply #2109 on: July 10, 2019, 02:27:13 AM »
Is anybody aware of a resource tracking albedo year over year?
Take a look at http://polarportal.dk/en/greenland/surface-conditions/
There's a link to the latest albedo map. If you copy that link, paste it in a browser, you can the edit it and get previous dates. I couldn't get 2012 though.






Dietrich

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Re: Jakobshavn Isbræ / Ilulissat Isfjord / West Greenland
« Reply #2110 on: July 10, 2019, 02:39:25 PM »
Thank you for the info.  Seems Albedo, like politics, is local.  What seems to be so notable in the Jakob basin this year is moderated slightly when the Island as a whole is considered.

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Re: Jakobshavn Isbræ / Ilulissat Isfjord / West Greenland
« Reply #2111 on: July 13, 2019, 10:46:04 PM »
Another calving and an advance between the 9th and 13th. It looks like there was a big burst of water released? I haven't really looked around much yet, but it looks very different from recent events.

click to animate