Support the Arctic Sea Ice Forum and Blog

Author Topic: Greenland ice sheet retreat  (Read 13005 times)

nukefix

  • ASIF Citizen
  • Posts: 406
    • View Profile
Re: Greenland ice sheet retreat
« Reply #50 on: August 04, 2017, 11:56:42 AM »
Ice sheets that are grounded on an inward-sloping submarine bed are fundamentally unstable, for example WAIS. In Greenland this is not expected to happen as the topography of the bedrock is much more benign:

https://www.the-cryosphere.net/7/499/2013/tc-7-499-2013.pdf

Jakobshaven goes deep inland under present day sea level but it's narrow. Mean-image of S-1 over 2017 brings the movement out nicely..

ps. I'm not familiar with the acronym GDF?

« Last Edit: August 04, 2017, 12:09:22 PM by nukefix »

oren

  • ASIF Upper Class
  • Posts: 1572
    • View Profile
Re: Greenland ice sheet retreat
« Reply #51 on: August 04, 2017, 02:48:01 PM »
ps. I'm not familiar with the acronym GDF?
I believe is means Glaciogenic Debris-Flow, but now sure how it's related to the discussion.

gerontocrat

  • ASIF Middle Class
  • Posts: 677
    • View Profile
Re: Greenland ice sheet retreat
« Reply #52 on: August 04, 2017, 03:25:13 PM »
NASA GRACE analysis from 2002 shows almost linear Greenland Ice Sheet mass loss trend. When will AGW accelerate the loss ?
"Para a Causa do Povo a Luta Continua!"

nukefix

  • ASIF Citizen
  • Posts: 406
    • View Profile
Re: Greenland ice sheet retreat
« Reply #53 on: August 04, 2017, 03:46:16 PM »
NASA GRACE analysis from 2002 shows almost linear Greenland Ice Sheet mass loss trend. When will AGW accelerate the loss ?
Arguably this already happened in the 1990's...but yes melting can potentially increase by a lot and we could have more summers with 2012-like extreme melt...

Daniel B.

  • ASIF Citizen
  • Posts: 126
    • View Profile
Re: Greenland ice sheet retreat
« Reply #54 on: August 04, 2017, 04:35:20 PM »
NASA GRACE analysis from 2002 shows almost linear Greenland Ice Sheet mass loss trend. When will AGW accelerate the loss ?

Certainly not this year.

johnm33

  • ASIF Middle Class
  • Posts: 758
    • View Profile
Re: Greenland ice sheet retreat
« Reply #55 on: August 05, 2017, 12:23:36 PM »
"When will AGW accelerate the loss ?"
When the meltwater of the interior gets access to the ocean?

oren

  • ASIF Upper Class
  • Posts: 1572
    • View Profile
Re: Greenland ice sheet retreat
« Reply #56 on: August 05, 2017, 10:57:23 PM »
"When will AGW accelerate the loss ?"
When the meltwater of the interior gets access to the ocean?
Indeed. Or when Zachariae Isstrom decides to let all hell break loose.

johnm33

  • ASIF Middle Class
  • Posts: 758
    • View Profile
Re: Greenland ice sheet retreat
« Reply #57 on: August 06, 2017, 05:39:11 PM »
It has to break out from the three rows of islands which are presently holding back it's melange and calving front, I begin to wonder if it'll have to wait to be weakened by ongoing melting to the north or south, although perhaps one almighty storm could clear it's path. That said it remains my favourite, there are so many ice streams falling into Jakobshavn that the fjord hardly ever clears, and Petermann tapers so much for so long, but maybe VAK is right.

nukefix

  • ASIF Citizen
  • Posts: 406
    • View Profile
Re: Greenland ice sheet retreat
« Reply #58 on: August 07, 2017, 07:19:00 AM »
"When will AGW accelerate the loss ?"
When the meltwater of the interior gets access to the ocean?
Indeed. Or when Zachariae Isstrom decides to let all hell break loose.
According to Bedmap2 there's only limited scope for retreat at NEGIS.