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Author Topic: Zachariae Isstrøm / Nioghalvfjerdsfjorden / NE Greenland  (Read 360448 times)

Espen

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Re: Zachariae Isstrøm / Nioghalvfjerdsfjorden / North East Greenland
« Reply #900 on: April 01, 2018, 11:53:32 PM »
Looking back a year - at my pet glacier - It has been a quite year at Zachariae Isstrøm compared to the last 5 years, maybe because of all the attention this impressive glacier received suddenly both here and in the scientific world, who knows (John "Bonzo" Bonham could not cope with it either)?
In the animation below:
A It is where you find the most important changes, the calving front is retreating and you will find cracks beyond it.
B The  general calving front is more or less the same, but future calves are seen further behind the front.
Kap Zach is being further sharpened
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Espen

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Re: Zachariae Isstrøm / Nioghalvfjerdsfjorden / North East Greenland
« Reply #901 on: April 02, 2018, 12:12:38 AM »
I may add that thinning of the ice sheet behind Zachariae Isstrøm is a reason for the "break" in the retreat and speed of the glacier?
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oren

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Re: Zachariae Isstrøm / Nioghalvfjerdsfjorden / North East Greenland
« Reply #902 on: April 02, 2018, 10:38:19 AM »
Espen thank you for the animation. I have been wondering about calving front advance/retreat.
In the stupid questions department, can yo post the link you use for these hi-res sat images? I know for certain I used to have it bookmarked but it somehow disappeared and I cannot recall what it was. Thanks.

Espen

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Re: Zachariae Isstrøm / Nioghalvfjerdsfjorden / North East Greenland
« Reply #903 on: April 02, 2018, 11:35:44 AM »
Oren but you will need to be registered:

https://scihub.copernicus.eu/dhus/#/home
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oren

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Re: Zachariae Isstrøm / Nioghalvfjerdsfjorden / North East Greenland
« Reply #904 on: April 02, 2018, 03:50:38 PM »
Thank you.

Wipneus

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Re: Zachariae Isstrøm / Nioghalvfjerdsfjorden / North East Greenland
« Reply #905 on: April 05, 2018, 04:25:17 PM »
What happened during the dark season in 16 Sentinel 1 images.

Tor Bejnar

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Re: Zachariae Isstrøm / Nioghalvfjerdsfjorden / North East Greenland
« Reply #906 on: April 05, 2018, 05:25:22 PM »
That is so cool, Wipneus!
The things I wondered about after looking not too deeply at 6-month old and current images are made crystal clear.
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RoxTheGeologist

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Re: Zachariae Isstrøm / Nioghalvfjerdsfjorden / North East Greenland
« Reply #907 on: April 05, 2018, 06:16:47 PM »

Wipneus

You have a talent for posting truly beautiful graphics. Thank you.

Tor Bejnar

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Re: Zachariae Isstrøm / Nioghalvfjerdsfjorden / North East Greenland
« Reply #908 on: July 03, 2018, 04:53:00 PM »
Nioghalvfjerdsbræ 70 km+ Long Supraglacial stream, Greenland’s Longest?
Article in From A Glacier's Perspective describes glacial features that promote long supraglacial streams (low slope, lack of crevasses, etc.), and what affect such streams may have on other features (smaller lakes, fewer moulins, etc.) plus image from 2011.  Click to enlarge.  Arrows point to stream; dots show calving front.
(image file changed from jpg to png)

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johnm33

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Re: Zachariae Isstrøm / Nioghalvfjerdsfjorden / North East Greenland
« Reply #909 on: July 14, 2018, 10:54:40 AM »
From sentinel meltponds on the two ice streams. 12th

 


johnm33

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Re: Zachariae Isstrøm / Nioghalvfjerdsfjorden / North East Greenland
« Reply #910 on: August 25, 2018, 10:24:00 AM »
Sea ice clearing from 79North

sentinel

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Re: Zachariae Isstrøm / Nioghalvfjerdsfjorden / North East Greenland
« Reply #911 on: August 26, 2018, 09:44:51 PM »
Lots of motion visible on Worldview.  Terra view, Aug 25 - 26
FNORD

oren

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Re: Zachariae Isstrøm / Nioghalvfjerdsfjorden / North East Greenland
« Reply #912 on: August 26, 2018, 11:20:26 PM »
I wonder if the ice sea would clear out of the bay this year and flush out the calved icebergs. It quite often does, and this year with the extremely low ice cover in the Greenland Sea, and the reverse winds that have blown north, I would have expected it to happen already.

johnm33

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Re: Zachariae Isstrøm / Nioghalvfjerdsfjorden / North East Greenland
« Reply #913 on: August 26, 2018, 11:57:51 PM »
There are a couple of zoomables on polarveiw just now that show the area, the tidal 'lake'  of 79N has melted, and there's an area south of Zach. isolated but clearly affected by tides + melt that may signal the start of the melt season hereabouts.

johnm33

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Re: Zachariae Isstrøm / Nioghalvfjerdsfjorden / North East Greenland
« Reply #914 on: September 11, 2018, 01:08:48 AM »
There's always a long wait for action on a glacier, except for the pressure of the ice sheet forcing glacial movement and compressing the sea ice, it seems we have to continue waiting till next season. Does this mean that more cold fresh water has been passing through Fram? or perhaps that tides/currents have carried warm Atlantic water, that previously would be forced south, through to ?Laptev?ESS? Whatever    despite this corner of Greenland seemingly melting almost as fast as anywhere south it appears there's been a sea change. I guess we'll have to see what happens when the ice cover expands enough to suppress tidal effects in the Arctic. It looks like the sea is close to freezing over

polarview

johnm33

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Re: Zachariae Isstrøm / Nioghalvfjerdsfjorden / North East Greenland
« Reply #915 on: September 20, 2018, 01:51:59 PM »
Looks like a powerful flow from beneath the ice shelf at 79N 19th - 20th





19  20 from polarveiw.

Espen

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Espen

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Re: Zachariae Isstrøm / Nioghalvfjerdsfjorden / North East Greenland
« Reply #917 on: December 19, 2018, 11:32:55 PM »
Strong calving activity at Zachariae Isstrøm:
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Re: Zachariae Isstrøm / Nioghalvfjerdsfjorden / North East Greenland
« Reply #918 on: December 20, 2018, 07:21:43 PM »
Wow! In the middle of December.

Espen

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Re: Zachariae Isstrøm / Nioghalvfjerdsfjorden / North East Greenland
« Reply #919 on: February 07, 2019, 05:50:00 PM »
A "new" development at Zachariae Isstrøm, at least for me, I have not seen or read anything about the stream in the southern part of Zachariae Isstrøm before, I named it Zydstrømmen (it should have been Sydstrømmen in Danish, but I picked the Z as in Zachariae instead).
I can see from old satelite data that it started as a noticeable stream in the early 2000s, but you may have more to add?   
« Last Edit: February 07, 2019, 05:55:23 PM by Espen »
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oren

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Re: Zachariae Isstrøm / Nioghalvfjerdsfjorden / North East Greenland
« Reply #920 on: February 07, 2019, 08:35:57 PM »
Nice catch Espen, and thanks for the long-term ZI animation, it is very useful in general.
I have never noticed this mini-stream before.

Espen

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Re: Zachariae Isstrøm / Nioghalvfjerdsfjorden / North East Greenland
« Reply #921 on: February 07, 2019, 08:52:21 PM »
Nice catch Espen, and thanks for the long-term ZI animation, it is very useful in general.
I have never noticed this mini-stream before.

Thanks Oren,

Mini ? It is + 2 km wide!
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oren

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Re: Zachariae Isstrøm / Nioghalvfjerdsfjorden / North East Greenland
« Reply #922 on: February 08, 2019, 02:19:49 AM »
Yeah, apologies for imprecise terms. Only meant relative to the main ice-stream of course.

johnm33

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Re: Zachariae Isstrøm / Nioghalvfjerdsfjorden / North East Greenland
« Reply #923 on: March 19, 2019, 10:04:39 PM »
Zoomable from Polar View looking at Nioghalvfjerdsfjorden, the ice in the fjord to it's north is looking thin with some signs of seawater penetration below, the same is true of the sea near the glaciers mouth, it seems a little early, but last year the whole season passed with very little activity.
Similar of Zachariae where the outflow seems to have stacked every exit.
Thought I'd refresh memories of the bathymetry and undercurrent hereabouts, image first posted by Sidd iirc.


iwantatr8

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Re: Zachariae Isstrøm / Nioghalvfjerdsfjorden / North East Greenland
« Reply #924 on: April 03, 2019, 05:19:49 PM »
It's always nice to start the season with a couple of clear Sentinel Images so to help everyone's habit.... ;)

Espen

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Re: Zachariae Isstrøm / Nioghalvfjerdsfjorden / North East Greenland
« Reply #925 on: April 05, 2019, 11:55:18 PM »
Just received, here is what you can get within hours, images of 2 Ice Bergs at Zachariae Isstrøm from 2 different sources Nasa (from a plane) and Sentinel 2 (from a satelite).
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Andreas T

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Re: Zachariae Isstrøm / Nioghalvfjerdsfjorden / North East Greenland
« Reply #926 on: April 06, 2019, 06:43:28 PM »
thanks for sharing this Espen, but could you let us know where (which website) the Nasa image comes from, I was unable to find it?

Espen

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Re: Zachariae Isstrøm / Nioghalvfjerdsfjorden / North East Greenland
« Reply #927 on: April 06, 2019, 08:04:46 PM »
thanks for sharing this Espen, but could you let us know where (which website) the Nasa image comes from, I was unable to find it?

It is from the Ice Bridge Project Newsletter
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nukefix

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Re: Zachariae Isstrøm / Nioghalvfjerdsfjorden / North East Greenland
« Reply #928 on: April 08, 2019, 11:45:03 AM »
I can see from old satelite data that it started as a noticeable stream in the early 2000s, but you may have more to add?
Do you mean that before 2000 the satellite-data was so scarce the existence of the stream was not noticed from space? Today it's being mapped every 6 days by Sentinel-1...times have certainly changed  8)

oren

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Re: Zachariae Isstrøm / Nioghalvfjerdsfjorden / North East Greenland
« Reply #929 on: April 08, 2019, 02:05:16 PM »
I think Espen means that the ice flow became noticeable after 2000, not because lack of coverage but because of actual changes.

nukefix

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Re: Zachariae Isstrøm / Nioghalvfjerdsfjorden / North East Greenland
« Reply #930 on: April 08, 2019, 03:23:59 PM »
I think Espen means that the ice flow became noticeable after 2000, not because lack of coverage but because of actual changes.
Loss of buttressing sea-ice?

iwantatr8

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Re: Zachariae Isstrøm / Nioghalvfjerdsfjorden / North East Greenland
« Reply #931 on: April 26, 2019, 06:46:13 PM »
Missed  this with the earlier image of 79N

It's got a loose tooth...  A stress crack has opened up near one of the pinning islands at the front.

Tealight

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Re: Zachariae Isstrøm / Nioghalvfjerdsfjorden / North East Greenland
« Reply #932 on: June 08, 2019, 09:28:48 PM »
Since the tongue separation in 2012 Zachariae Isstrøm has been continuously pumping out icebergs in the 100m to few kilometer size. Due to it's location behind an island chain these icebergs have very little chance to escape to the open ocean and melt in the North Atlantic. Today I want to share some images of the giant Tetris field Zachariae is creating.

The bottom of this field is over 100km further south and blocked by it's former giant ice tongue. Probably the southern 30km of this space is already full with tightly stacked icebergs and more are coming down every year. For now it doesn't look like the blockage is going to clear out. The only way to prevent further filling up of this space is local melt. If the heavy calving of the glacier continues it might completly clog up this entire space with icebergs over the next decade.

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Re: Zachariae Isstrøm / Nioghalvfjerdsfjorden / North East Greenland
« Reply #933 on: June 08, 2019, 09:53:07 PM »
Quote
giant Tetris field

LOL ;D

That's super interesting Tealight. Thanks for sharing.

oren

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Re: Zachariae Isstrøm / Nioghalvfjerdsfjorden / North East Greenland
« Reply #934 on: June 08, 2019, 10:15:31 PM »
Tealight, bear in mind that in some years in August the sea ice disappears from the inner bay, and all the icebergs are swept away. I think this happens every couple of years, but haven't done the stats. This is discussed somewhere upthread. My pet theory was that the massive iceberg jam stuck in sea ice could delay calving processes and even possibly slow the glacier down slightly. Never tested it though.

On a somewhat different issue, I wonder what would happen when the separated tongue melts out, which could open up the inner bay. But in the years since separation I haven't seen any sign of the tongue shrinking, so surely this is a far future thing.

oren

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Re: Zachariae Isstrøm / Nioghalvfjerdsfjorden / North East Greenland
« Reply #935 on: June 08, 2019, 11:18:18 PM »
(Long term animation of ZI)
The quoted post contains a 5-year animation by Espen. It shows nicely how the same icebergs stayed in the same configuration in the bay over the summer of 2015, the same phenomenon occurred in 2018, but in the summers of 2016 and 2017 the icebergs were cleared away.

Tealight

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Re: Zachariae Isstrøm / Nioghalvfjerdsfjorden / North East Greenland
« Reply #936 on: June 09, 2019, 01:24:21 AM »
Tealight, bear in mind that in some years in August the sea ice disappears from the inner bay, and all the icebergs are swept away. I think this happens every couple of years, but haven't done the stats. This is discussed somewhere upthread. My pet theory was that the massive iceberg jam stuck in sea ice could delay calving processes and even possibly slow the glacier down slightly. Never tested it though.

Oren, you are talking about recently calved icebergs. I was talking about icebergs that have already been swept away from the glacier. About 100km further south the icebergs are piling up like Tetris blocks. They just don't magically vanish  once a latitude line is full. There is still around 1800km2 (30*60) of space for new icebergs, but maybe 600km2 has already been tightly piling up.

johnm33

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Re: Zachariae Isstrøm / Nioghalvfjerdsfjorden / North East Greenland
« Reply #937 on: June 19, 2019, 01:22:32 PM »
Clear view on sentinel today, looking at bottom melt [?] just north of Niog.

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Re: Zachariae Isstrøm / Nioghalvfjerdsfjorden / North East Greenland
« Reply #938 on: July 12, 2019, 06:00:39 PM »
Melting to the west of 79N, July 10th

Wipneus

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Re: Zachariae Isstrøm / Nioghalvfjerdsfjorden / North East Greenland
« Reply #939 on: July 14, 2019, 09:56:26 AM »
Minor calving in the center of the Zachariae. The images have been scaled fro 10m->5m per pixel. The calving lies on its "side", allowing an estimation of local ice thickness: 380m.

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Re: Zachariae Isstrøm / Nioghalvfjerdsfjorden / North East Greenland
« Reply #940 on: July 21, 2019, 05:57:33 AM »
Lots of melting today, July 20.
I played around with the color balance to try to make this look more natural.

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Re: Zachariae Isstrøm / Nioghalvfjerdsfjorden / North East Greenland
« Reply #941 on: July 21, 2019, 06:30:01 AM »
That is a very well done image!  It is not misleading, and it shows the true conditions very nicely! 

Well done! 👍🏻

Espen

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Re: Zachariae Isstrøm / Nioghalvfjerdsfjorden / North East Greenland
« Reply #942 on: August 02, 2019, 11:49:48 PM »
An irrelevant calving happened at Spaltgletscher AKA Big Foot between Aug 1 and Aug 2 2019:
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bairgon

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Re: Zachariae Isstrøm / Nioghalvfjerdsfjorden / North East Greenland
« Reply #943 on: August 03, 2019, 11:44:17 PM »
An irrelevant calving happened at Spaltgletscher AKA Big Foot between Aug 1 and Aug 2 2019:

On the same day Gammel Hellerup (I think), just to the south, moved fairly significantly:

oren

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Re: Zachariae Isstrøm / Nioghalvfjerdsfjorden / North East Greenland
« Reply #944 on: August 03, 2019, 11:54:23 PM »
As far as I can tell this is Zachariae Isstrom, the main subject of this thread. I never heard of Gammel Hellerup before. I am sure Espen can shed more light though.

Espen

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Re: Zachariae Isstrøm / Nioghalvfjerdsfjorden / North East Greenland
« Reply #945 on: August 04, 2019, 12:24:25 AM »
Hello Oren,

The glacier Gammel Hellerup was named by Svend Sølver during the  Mørkefjord expedition in 1938-39, Gammel Hellerup was the high school he went to, I actually told the story to the rector of the school today, a few years ago, and he was not aware of a glacier named Gammel Hellerup?

Almost the same story I could tell about Zachariae Istrøm, I met Bobby Zachariae (a well known researcher here in Denmark) once and told him about a very impressive glacier that was named with his family name and not only that but after his grand grand something Georg Hugh Robert Zachariae, he thought I was joking, but luckily he had a smartphone and googled it instantly and thanked me a lot for the information.
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Re: Zachariae Isstrøm / Nioghalvfjerdsfjorden / North East Greenland
« Reply #946 on: August 04, 2019, 12:34:36 AM »
An irrelevant calving happened at Spaltgletscher AKA Big Foot between Aug 1 and Aug 2 2019:

On the same day Gammel Hellerup (I think), just to the south, moved fairly significantly:

Nope! Gammel Hellerup is a land based glacier. The one you are showing in the animation is actually Zachariae Isstrøm.
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oren

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Re: Zachariae Isstrøm / Nioghalvfjerdsfjorden / North East Greenland
« Reply #947 on: August 04, 2019, 12:40:36 AM »
Thanks Espen. Your depth of knowledge about Greenland is amazing.

Shared Humanity

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Re: Zachariae Isstrøm / Nioghalvfjerdsfjorden / North East Greenland
« Reply #948 on: August 04, 2019, 01:20:13 AM »
Thanks Espen. Your depth of knowledge about Greenland is amazing.

Agree

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Re: Zachariae Isstrøm / Nioghalvfjerdsfjorden / North East Greenland
« Reply #949 on: August 04, 2019, 07:49:52 AM »
Indeed, thanks.

Unfortunately I can't get Sentinel images as I'm getting a JSON error message saying "RATE_LIMIT_EXCEEDED".