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Author Topic: The caa-greenland mega crack  (Read 75312 times)

uniquorn

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Re: The caa-greenland mega crack
« Reply #200 on: July 22, 2022, 10:02:32 PM »
"Should I stay or should I go now?"

Lift off in the Lincoln sea is almost complete.
https://go.nasa.gov/3zrPeKS  light contrast

uniquorn

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Re: The caa-greenland mega crack
« Reply #201 on: July 23, 2022, 01:43:01 PM »
awi sic, v106 of the same area, jul18-22

uniquorn

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Re: The caa-greenland mega crack
« Reply #202 on: September 08, 2022, 10:55:28 AM »
Crack at the edges, press in the middle.  Lift off north of Princesse Thyra
awi sic-leads v110, aug25-sep6


uniquorn

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Re: The caa-greenland mega crack
« Reply #203 on: September 22, 2022, 10:43:16 AM »
"Should I stay or should I go now?"

Lift off in the Lincoln sea is almost complete.
https://go.nasa.gov/3zrPeKS  light contrast

Most of this winter's NW Greenland fast ice now at the entrance to Nares Strait. A hint of low concentration sea ice NE of Kap Kane.

1. https://go.nasa.gov/3Lx1dLJ  aug14-sep21

2. sep21

3. awi sic-leads v110, ngreenland, sep17-21
 

Glen Koehler

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Re: The caa-greenland mega crack
« Reply #204 on: September 23, 2022, 03:34:20 AM »
     The animation showing progress of mega crack ice towards Nares much appreciated.  It has me wondering if the Greenland mega crack and open Nares have occurred simultaneously in the past, or is this a new functional feature of ASI export?  Or does it not matter because that big block is about to plug the Nares gate as winter refreeze gets underway?
“What is at stake.... Everything, I would say." ~ Julienne Stroeve

Niall Dollard

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Re: The caa-greenland mega crack
« Reply #205 on: September 23, 2022, 08:08:54 AM »
Still much too early for any blockage of the Nares. The earliest blockage I can recall, occurred right after the year of lowest sea ice extent, on Nov 8th 2012.

uniquorn

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Re: The caa-greenland mega crack
« Reply #206 on: October 31, 2022, 11:05:35 AM »
Some last years fixed ice re-fixed just east of the entrance to the Nares. Yesterday it lifted off again. Unlikely that it will stay now.
awi sic-leads v110, oct26-30
https://go.nasa.gov/3WinQIQ

uniquorn

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Re: The caa-greenland mega crack
« Reply #207 on: November 11, 2022, 11:54:27 AM »
"Should I stay or should I go now?"

Lift off in the Lincoln sea is almost complete.
https://go.nasa.gov/3zrPeKS  light contrast

aaaannd.....it's gone.

https://go.nasa.gov/3G6mpY2  oct31-nov11

HapHazard

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Re: The caa-greenland mega crack
« Reply #208 on: July 12, 2023, 10:52:14 PM »
It's looks like it's opening up pretty good right now. Clouds obscuring a lot of it, but here's the progression of the last 3 days:

If I call you out but go no further, the reason is Brandolini's law.

uniquorn

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Re: The caa-greenland mega crack
« Reply #209 on: December 05, 2023, 10:55:52 AM »
the crack is back.
sic-leads v110, dec1-4

jdallen

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Re: The caa-greenland mega crack
« Reply #210 on: December 07, 2023, 03:46:44 AM »
the crack is back.
sic-leads v110, dec1-4
Yeah, the reign of 10+m thick land-fast sea ice is now a fast fading memory.
This space for Rent.

Ajpope85

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Re: The caa-greenland mega crack
« Reply #211 on: December 08, 2023, 03:46:15 AM »
Is this crack widening during the freezing season usual? This seems extremely concerning to me but I don't know enough about it.

johnm33

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Re: The caa-greenland mega crack
« Reply #212 on: December 08, 2023, 11:24:58 AM »
Is this crack widening during the freezing season usual? This seems extremely concerning to me but I don't know enough about it.
Whilst the wind plays it's part imo it's facilitated by the movement of water beneath the ice. Imagine a wave in a wave tank arriving at one end, then shift that to the arctic basins, first it pushes up through the ice as it impacts the shelf and shore, then it forms a slope for the ice to move away from the land and it does it repeatedly until the energy is spent. The ocean was recently less mobile and the ice thicker so it's becoming more 'usual'.

uniquorn

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Re: The caa-greenland mega crack
« Reply #213 on: December 08, 2023, 04:21:32 PM »
Lift off of 15km over 8 days, winds mostly westerly or northwesterly. When enlarged some tidal movement is apparent, particularly north of Borden Is, probably not inertial oscillation this near the coast.

rammb, dec1-7

https://col.st/T5lLH
https://go.nasa.gov/3taIS29
« Last Edit: December 08, 2023, 04:38:11 PM by uniquorn »

HapHazard

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Re: The caa-greenland mega crack
« Reply #214 on: June 02, 2024, 12:09:44 AM »
The crack is crackin' again:
If I call you out but go no further, the reason is Brandolini's law.

uniquorn

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Re: The caa-greenland mega crack
« Reply #215 on: September 30, 2024, 12:54:35 AM »
lift off.

HapHazard

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Re: The caa-greenland mega crack
« Reply #216 on: September 30, 2024, 06:20:43 AM »
Quite the lift off.
If I call you out but go no further, the reason is Brandolini's law.

johnm33

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Re: The caa-greenland mega crack
« Reply #217 on: September 30, 2024, 10:31:19 AM »
Maybe it was down to my bias but before this year I may have discounted the effect of wind too much. It's also possible that there's a threshold, almost a surface effect, which the ice has to thicken beyond before it gains any serious traction in the water.
  This doesn't look good for the ice, being stretched away from where it must hold to allow compaction to take place. Taken with the apparent new regime through Bering, where it seems outflowing surface fresh[er] water moves to balance the increased inflow at depth or along the Alaskan coast, which stream is moving east even through Amundsen. With the ice shifting north in the CAA it's worth thinking that that warmer water will increase pressure on the flow through Parry to Baffin. There's already, for the last month, now calming, incredible turbulence in the ocean approaches to Fram which suggests a regime change there too, as does the accelerated flow down the west coast of Nares, which may indicate an increased low of 'Arctic' naturalised Atlantic waters flowing out at depth. The warm inflow through Bering is helping to raise the humidity levels over the ice which will inhibit cooling and maybe prolong this unexpected hiatus.

John_The_Elder

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Re: The caa-greenland mega crack
« Reply #218 on: September 30, 2024, 03:37:15 PM »
There is no increase in the inflow from the pacific: " 1 Sverdrup of the relatively low salinity North Pacific water that enters the Bering Sea flows through the Bering Strait into the Arctic Ocean before eventually feeding into the more saline North Atlantic" https://agupubs.onlinelibrary.wiley.com/doi/full/10.1002/2015PA002840. Reading scientific papers to make informed conclusions instead of dreaming up ideas will help you understand what is happening. There is no "apparent new regime through Bering", do you have data to back your assertion?
John

Phil.

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Re: The caa-greenland mega crack
« Reply #219 on: September 30, 2024, 04:37:47 PM »
"Direct year-round, in-water measurements show the Pacific oceanic flow to the Arctic (which is only via the narrow Bering Strait) has been increasing for three decades. This flow is important to the region as it triggers seasonal ice retreat in the Pacific side of the Arctic, the “western Arctic,” and strongly influences the temperature, salinity, and nutrient content of western Arctic waters."

https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2023GL104697

uniquorn

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Re: The caa-greenland mega crack
« Reply #220 on: September 30, 2024, 06:26:22 PM »
Looks like there is some refreeze. Mercator models some upwelling at 30m. Largest polynya width is 50km

https://go.nasa.gov/4eHPWFJ
uswv https://data.marine.copernicus.eu/-/odu4hkw8il 30m

johnm33

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Re: The caa-greenland mega crack
« Reply #221 on: September 30, 2024, 06:37:47 PM »
Quote
There is no increase - blah blah - do you have data to back your assertion?
I'm looking at what's going on right now, if an academic study shows up it won't be for a couple of years, your link was published in 2015 so using data a decade old. Plus to be clear I'm not suggesting a greater net inflow, though I do suspect that, but an increased exchange, which in a way is worse since the loss is made up partly of fresher cooler waters from the Siberian river systems. What is new is the stream of cooler water tight to the coast which iirc someone first remarked on somewhere here last year.

uniquorn

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Re: The caa-greenland mega crack
« Reply #222 on: September 30, 2024, 06:45:54 PM »
Would have to check if the cool Siberian current is new, it appears to be seasonal

uniquorn

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Re: The caa-greenland mega crack
« Reply #223 on: December 29, 2024, 07:26:06 PM »
mega crack reaching deeper into the weaker ice in the CAA

HapHazard

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Re: The caa-greenland mega crack
« Reply #224 on: December 29, 2024, 09:15:04 PM »
Ice still looks pretty mobile in McClure, too.
If I call you out but go no further, the reason is Brandolini's law.