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Author Topic: PIG has calved  (Read 290680 times)

Adam Ash

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Re: PIG has calved
« Reply #1000 on: May 31, 2019, 01:42:16 PM »
The PIG may have thinned sufficiently to have become less brittle. Local crevasses may provide local stress relief, slowing the formation of full-width crevasses.     

...and in thinning, absorbed more heat too.  No?  And if so warmed toward its melting point, then, along with all the ice in the warming world, has it not become weaker, and more prone to structural mush-failure? 
And if a glacier fragments via structural failure rather than by melting, does not a one tonne block of floating fragmented ice (no matter how many degrees below its melting point it is) raise sea level by the same amount as that one tonne of ice will when it is melted?

Does this effect then lead to the observed meltwater pulses, whereby there is one metre sea level rise every 20 years for 500 years or so (entailing vast armadas of ice being washed into oceans by a relatively small amount of meltwater) followed by a pause while all that floating ice melts (hence slowing atmospheric warming trends), followed again by another ice-heating-to-structural-failure phase; mix and repeat until we have 70 metres of sea level rise '...in a timeframe inconceivable to man' [Hansen, Storms of our Children].   Mmmm?

b_lumenkraft

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Re: PIG has calved
« Reply #1001 on: June 10, 2019, 08:43:29 PM »
Not sure about that but i'm having the impression new cracks are forming.

IceConcerned

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Re: PIG has calved
« Reply #1002 on: June 13, 2019, 11:07:17 AM »
On the Western side, I have the impression that the crack have a path all the way to the open waters

Wipneus

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Re: PIG has calved
« Reply #1003 on: June 13, 2019, 06:48:32 PM »
Time for an update. Cracks are developing slowly and are becoming visible in the modes with lower resolution. Here is is EW, medium resolution: 40m. The higher resolution modes have a basis resolution of 10m.

The animation is 80m/pix resolution. Horizontal and vertical polarization of the reflected microwave radiation are code as Green and Blue.

Stephan

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Re: PIG has calved
« Reply #1004 on: June 13, 2019, 09:51:36 PM »
Thank you for that wonderful animation.
On the SW edge of the glacier (left upper corner) one of the cracks has significantly widened. A major calving in July 2019 to be expected?

Tony Mcleod

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Re: PIG has calved
« Reply #1005 on: June 14, 2019, 06:44:42 AM »
What is the width of the calving front?

Rich

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Re: PIG has calved
« Reply #1006 on: June 14, 2019, 08:15:32 AM »
What is the width of the calving front?

I think approximately 50km.

Wipneus

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Re: PIG has calved
« Reply #1007 on: June 14, 2019, 08:35:35 AM »
What is the width of the calving front?

Width (and height) of the image is 700*80 = 56000m or 56 km.

Stephan

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Re: PIG has calved
« Reply #1008 on: June 14, 2019, 04:47:21 PM »
...which then calculates (eyeballing-wise) to speeds of the calving front between 11 and 13 m/day.