Support the Arctic Sea Ice Forum and Blog

Author Topic: Zachariae Isstrøm / Nioghalvfjerdsfjorden / North East Greenland  (Read 311501 times)

Espen

  • ASIF Governor
  • Posts: 3116
    • View Profile
  • Liked: 24
  • Likes Given: 0
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
Have a ice day!

Espen

  • ASIF Governor
  • Posts: 3116
    • View Profile
  • Liked: 24
  • Likes Given: 0
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?
Have a ice day!

oren

  • ASIF Governor
  • Posts: 2969
    • View Profile
  • Liked: 318
  • Likes Given: 590
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

  • ASIF Governor
  • Posts: 3116
    • View Profile
  • Liked: 24
  • Likes Given: 0
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
Have a ice day!

oren

  • ASIF Governor
  • Posts: 2969
    • View Profile
  • Liked: 318
  • Likes Given: 590
Re: Zachariae Isstrøm / Nioghalvfjerdsfjorden / North East Greenland
« Reply #904 on: April 02, 2018, 03:50:38 PM »
Thank you.

Wipneus

  • ASIF Governor
  • Posts: 3844
    • View Profile
    • Arctische Pinguin
  • Liked: 217
  • Likes Given: 0
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

  • ASIF Upper Class
  • Posts: 2157
    • View Profile
  • Liked: 83
  • Likes Given: 24
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.
Arctic ice is healthy for children and other living things.

RoxTheGeologist

  • ASIF Citizen
  • Posts: 313
    • View Profile
  • Liked: 39
  • Likes Given: 1
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

  • ASIF Upper Class
  • Posts: 2157
    • View Profile
  • Liked: 83
  • Likes Given: 24
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)

Arctic ice is healthy for children and other living things.

johnm33

  • ASIF Upper Class
  • Posts: 1031
    • View Profile
  • Liked: 40
  • Likes Given: 8
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

  • ASIF Upper Class
  • Posts: 1031
    • View Profile
  • Liked: 40
  • Likes Given: 8
Re: Zachariae Isstrøm / Nioghalvfjerdsfjorden / North East Greenland
« Reply #910 on: August 25, 2018, 10:24:00 AM »
Sea ice clearing from 79North

sentinel

solartim27

  • ASIF Middle Class
  • Posts: 528
    • View Profile
  • Liked: 13
  • Likes Given: 15
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

  • ASIF Governor
  • Posts: 2969
    • View Profile
  • Liked: 318
  • Likes Given: 590
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

  • ASIF Upper Class
  • Posts: 1031
    • View Profile
  • Liked: 40
  • Likes Given: 8
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

  • ASIF Upper Class
  • Posts: 1031
    • View Profile
  • Liked: 40
  • Likes Given: 8
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

  • ASIF Upper Class
  • Posts: 1031
    • View Profile
  • Liked: 40
  • Likes Given: 8
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

  • ASIF Governor
  • Posts: 3116
    • View Profile
  • Liked: 24
  • Likes Given: 0
Have a ice day!