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Author Topic: The Nares Strait thread  (Read 659558 times)

blumenkraft

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Re: The Nares Strait thread
« Reply #2400 on: July 10, 2020, 06:59:59 PM »
Big holes are opening up in Lincoln alongside the Greenland coast as sea ice exports via Nares and the hight spins the ice pack. Click it.
"Is a thin line 'tween heaven and here" - Bubbles

blumenkraft

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Re: The Nares Strait thread
« Reply #2401 on: July 21, 2020, 02:19:52 PM »
Long time no DMI crop updates. But here they are from the day the action started.

Click to play.
"Is a thin line 'tween heaven and here" - Bubbles

blumenkraft

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Re: The Nares Strait thread
« Reply #2402 on: July 21, 2020, 05:50:00 PM »
Tidal forces create a mesmerizing real-life loading icon... Click needed.
"Is a thin line 'tween heaven and here" - Bubbles

oren

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Re: The Nares Strait thread
« Reply #2403 on: July 25, 2020, 11:30:05 PM »
Slowly but surely export from the Lincoln Sea down the Nares has begun. Hopefully winds can reverse the trend.
Click to animate.
« Last Edit: July 25, 2020, 11:35:17 PM by oren »

blumenkraft

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Re: The Nares Strait thread
« Reply #2404 on: July 28, 2020, 10:39:50 AM »
BTW, there are some icebergs around in the Lincoln Sea (older ones) and in the Petermann fjord (from the recent mini calving).
"Is a thin line 'tween heaven and here" - Bubbles

blumenkraft

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Re: The Nares Strait thread
« Reply #2405 on: August 04, 2020, 10:26:31 PM »
The weather forecast has northerlies down the channel the whole week. I would expect to see some ice exported from Lincoln now.
"Is a thin line 'tween heaven and here" - Bubbles

blumenkraft

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Re: The Nares Strait thread
« Reply #2406 on: August 07, 2020, 11:00:53 AM »
Here we go. Give it a gentle click, please.
"Is a thin line 'tween heaven and here" - Bubbles

HapHazard

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Re: The Nares Strait thread
« Reply #2407 on: August 07, 2020, 07:05:13 PM »
I like how that one big floe looks like it's rolling down a hill.

I guess it's all downhill from here, eh?

blumenkraft

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Re: The Nares Strait thread
« Reply #2408 on: August 07, 2020, 07:12:02 PM »
Nice pun, HapHazard.  ;)

Yes, really looks like rolling. When the ice moves south, it's confined to the Ellesmere side due to the Coriolis forces. The flowing speed might be higher in the middle of the strait since movement is caused by the wind, not a current. I think this is causing the rotation.
"Is a thin line 'tween heaven and here" - Bubbles

glennbuck

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Re: The Nares Strait thread
« Reply #2409 on: August 07, 2020, 07:27:01 PM »
Here we go. Give it a gentle click, please.

Wow, Awesome to see! It is Game on for the 2012 records! Roller coaster next few weeks.

oren

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Re: The Nares Strait thread
« Reply #2410 on: August 07, 2020, 07:34:38 PM »
Nares export is not significant enough to make much of a dent in a new record. 2019 export started in April, and did not have many episodes of reverse wind as this year, which started export only in early July. It's important for the thick ice in the Lincoln Sea, and impacts volume and long-term stability of the ice pack, but is not a short term game changer.
This year we have the floes that broke off from the northern Greenland coast and are swirling around in the Lincoln Sea. I am quite interested to see their fate, and have a private bet with myself that even the very large one (top left in the animation) will be sucked down the Nares this month, even though it was shifted slightly away from the "Nares envelope" by the previous up-wind event. When the wind joins the natural current and both are heading south, the envelope expands dramatically. This of course depends on how long the wind will blow down the strait before subsiding or even reversing again.

glennbuck

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Re: The Nares Strait thread
« Reply #2411 on: August 07, 2020, 07:46:15 PM »
I just mean in general game changer this year, thinness of the ice, possibility of a GAC.

Area is likely to be 1st, very tight race, the next 3 weeks are going to be very interesting.
 

be cause

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Re: The Nares Strait thread
« Reply #2412 on: August 09, 2020, 02:22:46 AM »
50km pd is fairly speedy .. the garlic press is running a little slower .. though I was surprised to see the big block move 80 km south to the west of Axel Heiberg in the last 4 days ..b.c..
2007 + 5 = 2012 + 4 = 2016 + 3 = 2019 + 2 = 2021 
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wallen

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Re: The Nares Strait thread
« Reply #2413 on: August 09, 2020, 09:16:31 AM »
Given how fragile the ice is, I will looking at how much it impacts in opening the Lincoln Sea over the next 30 or so days. Rather than export volume.

Latent

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Re: The Nares Strait thread
« Reply #2414 on: August 09, 2020, 02:00:28 PM »
My impression this year is that even the large floes are smashed by the time they arrive in the Kane basin.  I don't remember seeing such complete destruction in previous years....and these floes are presumably thick ice?

blumenkraft

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Re: The Nares Strait thread
« Reply #2415 on: August 10, 2020, 06:45:21 PM »
Yeah, Latent, these floes are just weak.

These two bigger floes in the Nares just went poof. GIF starts with the smaller one upper left. The bigger one follows suit.

Click to play.
"Is a thin line 'tween heaven and here" - Bubbles

oren

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Re: The Nares Strait thread
« Reply #2416 on: August 10, 2020, 07:22:56 PM »
Poof indeed!

uniquorn

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Re: The Nares Strait thread
« Reply #2417 on: August 10, 2020, 09:19:51 PM »
mind the gap
still, 11 hours isn't very long

oren

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Re: The Nares Strait thread
« Reply #2418 on: August 12, 2020, 03:45:54 AM »
A longer-term Worldview animation looking at the "Nares funnel" of the Lincoln Sea since initial breakup. Several interesting points:
* Once export begins, the ice in the funnel can move around more freely, quickly leading to loss of thin "glue" ice and breakup of thick sheets into floes.
* There is clearly a very strong current down the strait, manifesting itself in the funnel as well, with decreasing speed the further one goes from the strait.
* Several bouts of up-strait wind during the middle of the animation.
* The tug between the current and the wind is clearly asymmetrical - the current has strong inertia towards down-strait, and when the wind blows up-strait some floes are braving the storm and keeping their place. Once the wind reverses, movement down the funnel resumes at a much higher speed than any movement up-funnel.
* The prevalent movement of the Lincoln Sea this year from east to west is at odds with the funnel effect, with the biggest floe (top center) still trying to decide whether to go down the funnel or circle around Ellesmere.

Click to animate.
« Last Edit: August 12, 2020, 03:58:22 AM by oren »