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Author Topic: Zachariae Isstrøm / Nioghalvfjerdsfjorden / NE Greenland  (Read 366907 times)

Wipneus

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Re: Zachariae Isstrøm / Nioghalvfjerdsfjorden / North East Greenland
« Reply #950 on: August 04, 2019, 08:32:32 AM »
Indeed, thanks.

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

I have not been able to download any images either. The Sentinel hub says:

Quote
t has been observed a decrease of the performances related to the products download following the Security Maintenance on 29-30 July.

Downloads might be slow and/or interrupted on the following services:

    Copernicus Open Access Hub (including API Hub)
    Collaborative Data Hub Node-1
    Copernicus Services Data Hub

Investigation is on going.

We apologise for any inconvenience caused to your activities.

https://scihub.copernicus.eu/news/News00585

Keep trying...


blumenkraft

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Re: Zachariae Isstrøm / Nioghalvfjerdsfjorden / North East Greenland
« Reply #952 on: August 04, 2019, 03:40:46 PM »
OMG awesome, Zxy!!

Thanks a lot.
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nanning

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Re: Zachariae Isstrøm / Nioghalvfjerdsfjorden / North East Greenland
« Reply #953 on: August 04, 2019, 06:17:15 PM »
Yes thanks zxy, great! Welcome.
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Espen

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Re: Zachariae Isstrøm / Nioghalvfjerdsfjorden / North East Greenland
« Reply #954 on: August 05, 2019, 09:27:06 PM »
Heavy action in Jøkelbugt (Glacier Bay) notice how the calved icebergs in front or Zachariae Isstrøm are sucked away from the sea ice movements further out:
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Espen

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Re: Zachariae Isstrøm / Nioghalvfjerdsfjorden / North East Greenland
« Reply #955 on: August 06, 2019, 11:02:59 AM »
Heavy action in Jøkelbugt (Glacier Bay) notice how the calved icebergs in front or Zachariae Isstrøm are sucked away from the sea ice movements further out:

Better seen here:
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JayW

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Re: Zachariae Isstrøm / Nioghalvfjerdsfjorden / North East Greenland
« Reply #956 on: August 06, 2019, 11:34:47 AM »
Heavy action in Jøkelbugt (Glacier Bay) notice how the calved icebergs in front or Zachariae Isstrøm are sucked away from the sea ice movements further out:

Better seen here:

Neat how that one pond drained.
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Stephan

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Re: Zachariae Isstrøm / Nioghalvfjerdsfjorden / North East Greenland
« Reply #957 on: August 06, 2019, 02:05:35 PM »
...and some minor calvings happened on Zachariæ Isstrøm.
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Shared Humanity

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Re: Zachariae Isstrøm / Nioghalvfjerdsfjorden / North East Greenland
« Reply #958 on: August 06, 2019, 04:03:31 PM »
Looking at that animation, it’s a good thing the ice sheet to the north of the glacier which use to be part of the glacier is still there. When it breaks up the glacier will calve much more rapidly with an exit to the north.
« Last Edit: August 06, 2019, 06:26:42 PM by Shared Humanity »

RoxTheGeologist

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Re: Zachariae Isstrøm / Nioghalvfjerdsfjorden / North East Greenland
« Reply #959 on: August 06, 2019, 04:18:03 PM »
Heavy action in Jøkelbugt (Glacier Bay) notice how the calved icebergs in front or Zachariae Isstrøm are sucked away from the sea ice movements further out:

I guess there is substantial amounts of meltwater flowing out of the glacier, would that help move the icebergs?

Espen

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Re: Zachariae Isstrøm / Nioghalvfjerdsfjorden / North East Greenland
« Reply #960 on: August 06, 2019, 07:03:30 PM »
Due to the havoc in Jøkelbugt, Zachariae Isstrøm did a large calving today August 6 2019:
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Espen

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Re: Zachariae Isstrøm / Nioghalvfjerdsfjorden / North East Greenland
« Reply #961 on: August 06, 2019, 09:52:16 PM »
It was a 11 km2 calf that took off today:
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oren

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Re: Zachariae Isstrøm / Nioghalvfjerdsfjorden / North East Greenland
« Reply #962 on: August 06, 2019, 09:57:57 PM »
Interesting, I've always thought the ice mass in the bay helps stabilize the glacier a little, delaying calving that would otherwise have occurred.

Thanks to the sentinel link posted up-thread, I am working on a couple of long term animations of ZI and its surroundings. I hope to post them later tonight, if I finish them.

Stephan

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Re: Zachariae Isstrøm / Nioghalvfjerdsfjorden / North East Greenland
« Reply #963 on: August 06, 2019, 10:18:27 PM »
I wonder about the grey coloured ice free spot in the lower third at the calving front. Is this a place where meltwater from underneath the glacier flows into the sea?
It is too late just to be concerned about Climate Change

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Re: Zachariae Isstrøm / Nioghalvfjerdsfjorden / North East Greenland
« Reply #964 on: August 06, 2019, 10:31:47 PM »
I wonder about the grey coloured ice free spot in the lower third at the calving front. Is this a place where meltwater from underneath the glacier flows into the sea?

I am not what sure what creates these ice free spots, but will you find them reguarly at the calving front of many glaciers.

As here in Giesecke Isfjord:
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zxy

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Re: Zachariae Isstrøm / Nioghalvfjerdsfjorden / North East Greenland
« Reply #965 on: August 07, 2019, 12:02:21 AM »
I wonder about the grey coloured ice free spot in the lower third at the calving front. Is this a place where meltwater from underneath the glacier flows into the sea?

I am not what sure what creates these ice free spots, but will you find them reguarly at the calving front of many glaciers.

As here in Giesecke Isfjord:


This time it was a lake that emptied. See attached gif.

« Last Edit: August 07, 2019, 12:11:46 AM by zxy »

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Re: Zachariae Isstrøm / Nioghalvfjerdsfjorden / North East Greenland
« Reply #966 on: August 07, 2019, 02:30:10 AM »
That is so cool. Thanks.

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Re: Zachariae Isstrøm / Nioghalvfjerdsfjorden / North East Greenland
« Reply #967 on: August 07, 2019, 07:27:38 AM »
Very cool. It seems obvious that the drained lake's water appeared at the calving front.
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Espen

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Re: Zachariae Isstrøm / Nioghalvfjerdsfjorden / North East Greenland
« Reply #968 on: August 07, 2019, 08:33:44 AM »
I wonder about the grey coloured ice free spot in the lower third at the calving front. Is this a place where meltwater from underneath the glacier flows into the sea?

I am not what sure what creates these ice free spots, but will you find them reguarly at the calving front of many glaciers.

As here in Giesecke Isfjord:


This time it was a lake that emptied. See attached gif.



Problem solved! Thanks
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jmshelton

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Re: Zachariae Isstrøm / Nioghalvfjerdsfjorden / North East Greenland
« Reply #969 on: August 07, 2019, 10:24:27 PM »
That's so cool is got me to log on and post!

nukefix

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Re: Zachariae Isstrøm / Nioghalvfjerdsfjorden / North East Greenland
« Reply #970 on: August 08, 2019, 12:04:36 AM »
Super amazing!!

oren

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Re: Zachariae Isstrøm / Nioghalvfjerdsfjorden / North East Greenland
« Reply #971 on: August 08, 2019, 04:47:03 AM »
3 animations, one for each of the summer seasons 2016, 2017, 2018, using only cloud-free images from Sentinel 2.
Note: It is easy to see the difference between seasons where the sea ice broke loose in August, and those where it stayed fast.
Note 2: Interesting to see how many of the melt lakes appear in the spot every season.

zxy

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Re: Zachariae Isstrøm / Nioghalvfjerdsfjorden / North East Greenland
« Reply #972 on: August 09, 2019, 01:58:18 AM »
Iceberg crash outside Zacharie.
Source: Sentinel Playground

(Click to see animation)
« Last Edit: August 09, 2019, 04:15:46 AM by zxy »

Espen

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Re: Zachariae Isstrøm / Nioghalvfjerdsfjorden / North East Greenland
« Reply #973 on: August 13, 2019, 10:35:35 AM »
Another large calving at Zachariae Isstrøm:
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Espen

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Re: Zachariae Isstrøm / Nioghalvfjerdsfjorden / North East Greenland
« Reply #974 on: August 13, 2019, 09:46:35 PM »
The former calving front of Zachariae Isstrøm, now only a very big piece of "death" ice (330 km2), was hit by the rush hour of escaping glacier ice:
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Re: Zachariae Isstrøm / Nioghalvfjerdsfjorden / North East Greenland
« Reply #975 on: August 16, 2019, 01:26:32 PM »
Another large Full Moon calving at Zachariae Isstrøm:
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Espen

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Re: Zachariae Isstrøm / Nioghalvfjerdsfjorden / North East Greenland
« Reply #976 on: August 18, 2019, 01:10:00 PM »
Double calving between yesterday and today:
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Re: Zachariae Isstrøm / Nioghalvfjerdsfjorden / North East Greenland
« Reply #977 on: August 25, 2019, 12:02:31 PM »
Just a link to a JayW animation of the Greenland sea clearing the ice for some late season action.
https://forum.arctic-sea-ice.net/index.php/topic,2649.msg224396.html#msg224396

Espen

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Re: Zachariae Isstrøm / Nioghalvfjerdsfjorden / North East Greenland
« Reply #978 on: September 04, 2019, 08:23:57 AM »
Here is an updated retreat situation at Zachariae Isstrøm:
« Last Edit: September 04, 2019, 11:04:38 AM by Espen »
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oren

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Re: Zachariae Isstrøm / Nioghalvfjerdsfjorden / North East Greenland
« Reply #979 on: September 04, 2019, 08:27:02 AM »
Thank you Espen. I was wondering about this.

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Re: Zachariae Isstrøm / Nioghalvfjerdsfjorden / North East Greenland
« Reply #980 on: September 04, 2019, 04:31:24 PM »
Has there been any deterioration of the portion that has separated from the glacier?

Espen

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Re: Zachariae Isstrøm / Nioghalvfjerdsfjorden / North East Greenland
« Reply #981 on: September 04, 2019, 05:05:15 PM »
Has there been any deterioration of the portion that has separated from the glacier?

Yes but relatively little, but some parts in the north, east and south.
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Re: Zachariae Isstrøm / Nioghalvfjerdsfjorden / North East Greenland
« Reply #982 on: September 04, 2019, 06:50:45 PM »
Has there been any deterioration of the portion that has separated from the glacier?

Yes but relatively little, but some parts in the north, east and south.

That's good. Once this ice shelf disappears and this area becomes seasonal ice, would this have an effect on the behavior of the glacier and the ice that calves from it?

Espen

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Re: Zachariae Isstrøm / Nioghalvfjerdsfjorden / North East Greenland
« Reply #983 on: September 04, 2019, 10:18:03 PM »
Has there been any deterioration of the portion that has separated from the glacier?

Yes but relatively little, but some parts in the north, east and south.

That's good. Once this ice shelf disappears and this area becomes seasonal ice, would this have an effect on the behavior of the glacier and the ice that calves from it?

No I dont think that do will result in any major differences, the big thing that happened to Zachariae Isstrøm was the paradigm shift in the sea ice in front of the islands in Jøkelbugt which took place in the beginning of this century 2001 and 2002 especially, in 2002 almost all or 99% of the sea ice disappeared for the first time in satelite history and the cork in front of Zachariae Isstrøm, a massive amount of old glacier ice could leave the area and set the speed of calving followed by a massive retreat that we can witness today. The image below is from the Zachariae Isstrøm paradigme shift year 2002:
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Espen

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Re: Zachariae Isstrøm / Nioghalvfjerdsfjorden / North East Greenland
« Reply #984 on: September 04, 2019, 11:04:33 PM »
I may add that the year 2002 and is very similar to 2019, since both the Independence Fjord system  (including Danmark Fjord and Hagen Fjord) and the Jøkelbugt area is covered with very little sea ice as in 2002 see below:
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Re: Zachariae Isstrøm / Nioghalvfjerdsfjorden / North East Greenland
« Reply #985 on: September 05, 2019, 09:33:44 PM »
Has there been any deterioration of the portion that has separated from the glacier?

Here is animation showing the deteriotion from 2009 to 2019:
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Espen

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Re: Zachariae Isstrøm / Nioghalvfjerdsfjorden / North East Greenland
« Reply #986 on: September 06, 2019, 11:53:54 AM »
Here is actually a very up to date image of the tongue, taken yesterday by the Icebridge Team:
« Last Edit: September 06, 2019, 12:15:19 PM by Espen »
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Re: Zachariae Isstrøm / Nioghalvfjerdsfjorden / North East Greenland
« Reply #987 on: September 11, 2019, 08:22:13 PM »
Todays polarview and 3 days til' the full moon


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Re: Zachariae Isstrøm / Nioghalvfjerdsfjorden / North East Greenland
« Reply #988 on: September 12, 2019, 11:43:30 AM »
Thanks John - where is the current landing/search page for the PolarView-data? The old site has been inactivated for awhile now...

blumenkraft

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Re: Zachariae Isstrøm / Nioghalvfjerdsfjorden / North East Greenland
« Reply #989 on: September 12, 2019, 11:46:35 AM »
https://www.polarview.aq/antarctic or /arctic respectively. Nuke.
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nukefix

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Re: Zachariae Isstrøm / Nioghalvfjerdsfjorden / North East Greenland
« Reply #990 on: September 12, 2019, 03:25:52 PM »
Oh I did not realise it had only stopped to function in Chrome for me while it still works in Firefox - thanks!

blumenkraft

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Re: Zachariae Isstrøm / Nioghalvfjerdsfjorden / North East Greenland
« Reply #991 on: September 12, 2019, 04:15:30 PM »
Wow, that's weird.

Welcome, Nuke. :)
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Re: Zachariae Isstrøm / Nioghalvfjerdsfjorden / North East Greenland
« Reply #992 on: September 19, 2019, 10:35:04 PM »
In cooperation with the Operation Ice Bridge Team and especially Sea Ice Scientist Linette Boisvert NASA who sent me many images and a few videos from their trip across Zachariae Isstrøm on September 5 2019, the delay in the publishing is due to the poor internet band width at Thule Airbase.
We start this round of images from the top of Zachariae Isstrøm including the giant meltponds then passing the calving front across the Zach Bay and at the end we reach the former glacier tongue of Zachariae Isttrøm, now a death piece of glacier ice, enjoy and again thanks to Linette:
« Last Edit: September 19, 2019, 10:43:58 PM by Espen »
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Re: Zachariae Isstrøm / Nioghalvfjerdsfjorden / North East Greenland
« Reply #993 on: September 19, 2019, 10:36:46 PM »
More images:
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Re: Zachariae Isstrøm / Nioghalvfjerdsfjorden / North East Greenland
« Reply #994 on: September 19, 2019, 10:38:08 PM »
Some more:
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Re: Zachariae Isstrøm / Nioghalvfjerdsfjorden / North East Greenland
« Reply #995 on: September 19, 2019, 10:39:36 PM »
And more:

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oren

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Re: Zachariae Isstrøm / Nioghalvfjerdsfjorden / North East Greenland
« Reply #996 on: September 19, 2019, 11:09:35 PM »
Wow. Just wow.
Seeing the familiar calving front up close and personal gives meaningful insight to the scale of the thing.

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Re: Zachariae Isstrøm / Nioghalvfjerdsfjorden / North East Greenland
« Reply #997 on: September 19, 2019, 11:17:01 PM »
Wow. Just wow.
Seeing the familiar calving front up close and personal gives meaningful insight to the scale of the thing.

Yes it is a bit different to LEGO?
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Re: Zachariae Isstrøm / Nioghalvfjerdsfjorden / North East Greenland
« Reply #998 on: September 20, 2019, 01:35:05 AM »
Thanks for being here & doing what you do, Espen.

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Re: Zachariae Isstrøm / Nioghalvfjerdsfjorden / North East Greenland
« Reply #999 on: September 20, 2019, 03:04:44 PM »
Wow, those are incredible pictures, especially the ones showing the calved icebergs.