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Author Topic: The Nares Strait thread  (Read 571070 times)

oren

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Re: The Nares Strait thread
« Reply #2050 on: July 28, 2019, 12:12:08 PM »
Isn't the current hugging the right side a result of the Coriolis effect?

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Re: The Nares Strait thread
« Reply #2051 on: July 28, 2019, 12:33:20 PM »
Hans Island is mostly steep-sided limestone or dolomite, so it likely erodes mostly from the sides.  Ice floes will basically cause below water line erosion, while freeze-thaw action, chemical weathering and surface runoff will affect the subaerial surface.  Per the internet chemical weathering of maybe "one-twentieth of a centimeter every 100 years" could be expected, but this would be in a more temperate climate, so I'll guess a 0.25 to 0.5 cm of loss this past 2,000 years from chemical weathering.

I'm really just guessing, but 500 good bumps or scrapes per year, so in 2,000 years, what, on the order of a centimeter or two?

In this Sentinel shot, there is still ice on the shores of Hans. I wonder if this ice is somehow compressed and acts as a bumper?
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blumenkraft

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Re: The Nares Strait thread
« Reply #2052 on: July 28, 2019, 12:38:45 PM »
Isn't the current hugging the right side a result of the Coriolis effect?

That's a possibility i never considered. Added to my variables list.
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Re: The Nares Strait thread
« Reply #2053 on: July 29, 2019, 11:26:39 AM »
well worth a peek back to 2009 on Worldview .. forward thru the next week .. a mega-floe arrives at the entrance .. b.c.
2007 + 5 = 2012 + 4 = 2016 + 3 = 2019 ...

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Re: The Nares Strait thread
« Reply #2054 on: July 29, 2019, 04:06:10 PM »
B.C., do you mean the fast ice monster in the north of Greenland? It barely moved west though.
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Re: The Nares Strait thread
« Reply #2055 on: July 29, 2019, 04:09:59 PM »
Surface current has stopped again.

There are northwards winds atm.
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Re: The Nares Strait thread
« Reply #2056 on: July 29, 2019, 05:01:43 PM »
B.C., do you mean the fast ice monster in the north of Greenland? It barely moved west though.
Hi bl ..
 I mean the 50x50 km block arriving at Nares entrance .. it has all entered Nares by the 13th .. b.c.
2007 + 5 = 2012 + 4 = 2016 + 3 = 2019 ...

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Re: The Nares Strait thread
« Reply #2057 on: July 29, 2019, 06:13:07 PM »
B.C., do you mean the fast ice monster in the north of Greenland? It barely moved west though.
Hi bl ..
 I mean the 50x50 km block arriving at Nares entrance .. it has all entered Nares by the 13th .. b.c.

Ok  ;D

Now i see it too. Had to rotate the display to see it. :P
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Re: The Nares Strait thread
« Reply #2058 on: August 06, 2019, 06:20:29 PM »
Calving in Kane basin as we speak.
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Re: The Nares Strait thread
« Reply #2059 on: August 08, 2019, 08:53:57 PM »
Stranded icebergs in Kane basin.

From 01.08 without cloudy days.

(Give it a click)
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Re: The Nares Strait thread
« Reply #2060 on: August 09, 2019, 11:38:39 AM »
Polarview sentinel 1 yesterday

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Re: The Nares Strait thread
« Reply #2061 on: August 09, 2019, 03:42:41 PM »
Slightly ot, interesting animations of arctic tides, though i think they've developed, showing the surge out of Nares into Lincoln. http://fvcom.smast.umassd.edu/2014/01/27/4-research-tidal-simulation/

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Re: The Nares Strait thread
« Reply #2062 on: August 09, 2019, 03:54:29 PM »
Those are beautiful animations. Thanks for sharing John.
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uniquorn

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Re: The Nares Strait thread
« Reply #2063 on: August 09, 2019, 06:37:17 PM »
<interesting animations of arctic tides>
m2_ar in Lincoln looking pretty close to the shape of yesterday's polynya (though it matches the bathy as well)

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Re: The Nares Strait thread
« Reply #2064 on: August 09, 2019, 06:45:38 PM »
I'm positive the polynya in Lincoln is caused by tides, Uniquorn. It forms when there is no southwards surface current in Nares.
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Re: The Nares Strait thread
« Reply #2065 on: August 09, 2019, 06:50:52 PM »
yes, tend to agree, but at the moment it's caused by melt rather than an arch. So maybe mixing caused by tides.

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Re: The Nares Strait thread
« Reply #2066 on: August 09, 2019, 07:08:42 PM »
Yes, agreed. There is a lot of melting going on in all of the Strait. Warm water might get pushed south.

Edit: Add SST from Windy (ECMWF).
« Last Edit: August 09, 2019, 07:33:39 PM by blumenkraft »
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Re: The Nares Strait thread
« Reply #2067 on: August 11, 2019, 09:32:58 AM »
DMI-crop animation.

I think the polynya has closed at the moment - or is this dust in the last frame?

However, the whole pack came down a little.
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Re: The Nares Strait thread
« Reply #2068 on: August 12, 2019, 07:42:50 PM »
Those grounded icebergs in Kane Basin are somewhat of a mystery to me. With all the swirls and tides and standing waves going on there, one would think they can't last long.

Too sad Rammb doesn't pick them up. I would love to see how they move in tides or how they behave when a floe runs into them. I've seen them wiggling around on Sentinel, but with a daily resolution, it's hard to see what's going on.
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Re: The Nares Strait thread
« Reply #2069 on: August 12, 2019, 07:59:33 PM »
Here are two of those icebergs.

Seems like the left one made it loose.

The time frame here is 01.08. to 11.08 without cloudy days.
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blumenkraft

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Re: The Nares Strait thread
« Reply #2070 on: August 12, 2019, 08:12:38 PM »
I think the polynya has closed at the moment - or is this dust in the last frame?

Likely dust?

DMI-crop 09/10/11.08. The pack moved east during this time frame. Click it!
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Re: The Nares Strait thread
« Reply #2071 on: August 12, 2019, 08:31:29 PM »
Those grounded icebergs in Kane Basin

Looks like this on radar btw.

I see a wavy pattern. As if there were dune-like structures below?
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Re: The Nares Strait thread
« Reply #2072 on: August 12, 2019, 08:36:35 PM »
Wikipedia article on Kane Basin has this picture from 2008

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Re: The Nares Strait thread
« Reply #2073 on: August 12, 2019, 08:53:02 PM »
Ladies and gentleman, Elisha Kent Kane (February 3, 1820 – February 16, 1857)

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Re: The Nares Strait thread
« Reply #2074 on: August 14, 2019, 09:17:07 PM »
A couple of clear days. YEY!

I2 Band, click to play.
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Re: The Nares Strait thread
« Reply #2075 on: August 14, 2019, 09:35:44 PM »
Lower strait had 3 clear days in a row causing a big file size - sorry for that.

I2 band, click to play.
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Re: The Nares Strait thread
« Reply #2076 on: August 14, 2019, 09:41:15 PM »
Warm waters creeping up the strait.
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oren

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Re: The Nares Strait thread
« Reply #2077 on: August 15, 2019, 04:16:51 AM »
Lower strait had 3 clear days in a row causing a big file size - sorry for that.

I2 band, click to play.
Nice animations. I wonder how long that ice in Kane basin will survive, I can't believe it will last the season.

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Re: The Nares Strait thread
« Reply #2078 on: August 15, 2019, 10:46:50 PM »
2007 + 5 = 2012 + 4 = 2016 + 3 = 2019 ...

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Re: The Nares Strait thread
« Reply #2079 on: August 15, 2019, 10:57:15 PM »
Lower strait had 3 clear days in a row causing a big file size - sorry for that.

I2 band, click to play.
Nice animations. I wonder how long that ice in Kane basin will survive, I can't believe it will last the season.

That ice is a mix of glacier ice (from Humboldt Glacier) and sea ice from the north somewhere, I doubt the sea ice is from Nares, the glacier ice will survive at least half year if it gets out of Nares and into Baffin Bay before seasonal shutdown.
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Re: The Nares Strait thread
« Reply #2080 on: August 16, 2019, 07:25:04 PM »
Nice animations. I wonder how long that ice in Kane basin will survive, I can't believe it will last the season.

Thanks Oren. :)

Most floes in the basin are likely melting out - they will be pushed into the warm water sooner or later.

But as Espen said, a lot of stuff is grounded icebergs. I don't think they will melt this season.
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Re: The Nares Strait thread
« Reply #2081 on: August 17, 2019, 11:04:07 AM »
Zoom in on Kane via RAMMB.

A rather lame tidal wave the day after the full moon.

Click it.
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Re: The Nares Strait thread
« Reply #2082 on: August 17, 2019, 06:58:18 PM »
DMI Lincoln and Kennedy crop.

Floes are entering hesitantly. Are they pushed in from the ice pack above, or is there a mellow current?

If there is a current, Alphabet Hotel called it a few days ago!

Nares Strait export may be starting again. This is yesterday vs. today.
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Re: The Nares Strait thread
« Reply #2083 on: August 19, 2019, 09:24:42 PM »
Ice on the [other right] side of the strait, my take

going from the pole to southern greenland is about 300 the difference in tangential surface speed is 500mph+ so about 17mph/27kph per degree, the only way the ice gains speed is to spend a little time on Ellesmeres coast.

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Re: The Nares Strait thread
« Reply #2084 on: August 19, 2019, 09:39:15 PM »
Great graph! Thanks for sharing, John. Indeed another piece of the puzzle i bet.
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Re: The Nares Strait thread
« Reply #2085 on: August 21, 2019, 09:01:38 PM »
There was no DMI Kennedy/Lincoln crop for yesterday. Meh -.-

So this GIF is missing the 20th. No southwards surface current (yet) i say.
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Espen

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Re: The Nares Strait thread
« Reply #2086 on: August 22, 2019, 05:52:51 PM »
Hanseatic Nature was visiting Hans Ø today, talking about masstourisme?
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Re: The Nares Strait thread
« Reply #2087 on: August 22, 2019, 09:45:24 PM »
Holy shit.  ::)

I guess they don't even do some measurements?
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Re: The Nares Strait thread
« Reply #2088 on: August 23, 2019, 12:36:06 AM »
Mass tourism in the Arctic. Can you imagine the year after BOE?

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Re: The Nares Strait thread
« Reply #2089 on: August 23, 2019, 09:11:42 AM »
Here is a few images from the visit of Hanseatic Nature August 22 2019:
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Re: The Nares Strait thread
« Reply #2090 on: August 23, 2019, 10:10:20 AM »
Smith Sund, the entrance to Nares Stræde this morning (looking south), Kap Alexander (Greenland to the left):
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Re: The Nares Strait thread
« Reply #2091 on: August 23, 2019, 12:32:03 PM »
Another image of Dodge Gletscher a few minutes ago (Hanseatic Nature) read more about  Dodge Gletscher at Mauris Blog:

https://blogs.agu.org/fromaglaciersperspective/2013/01/12/dodge-glacier-and-storm-glacier-retreat-northern-greenland/

« Last Edit: August 23, 2019, 02:40:14 PM by Espen »
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Re: The Nares Strait thread
« Reply #2092 on: August 23, 2019, 02:18:39 PM »
Looking at Hans, it is no mystery why flows shatter when they slam up against it.

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Re: The Nares Strait thread
« Reply #2093 on: August 23, 2019, 07:51:56 PM »
Thanks so much for sharing, Espen. Great to have this perspective for once. Not too shabby they went there after all. ;)

The wind north Nares / Lincoln is blowing northwards pretty hard at the moment and that seems to push the ice out of the channel. We will have strong winds in this direction for two days straight.

In this GIF i have increased the contrast to veil dust. I think this works well. If you like the originals better, let me know.
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Re: The Nares Strait thread
« Reply #2094 on: August 23, 2019, 10:36:48 PM »
Now out of Nares Stræde, but just south of Smith Sund, we got the mystirous Carey Øer and in the mist like in a Von Trier setting, its amazing what you can collect from a deck on a cruise liner nowadays:

You may spend a some 15,000 USD or more for this trip, wawes are not excluded
« Last Edit: August 23, 2019, 11:18:56 PM by Espen »
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Re: The Nares Strait thread
« Reply #2095 on: August 23, 2019, 11:53:52 PM »
Woe wawes ...

And fro the navele doun al covered was / With wawes grene, and brighte as any glas.

blumenkraft

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Re: The Nares Strait thread
« Reply #2096 on: August 24, 2019, 10:42:04 AM »
Apparently, the floes are, driven by wind, moving north at the moment. And look, they are confined to the right side of the floating direction.

Your comments and thoughts, please.
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Re: The Nares Strait thread
« Reply #2097 on: August 24, 2019, 11:59:45 AM »
It's amazing what you can collect from a deck on a cruise liner nowadays

The artifacts produced by the "panoramic" webcam when the wind gets up are most intriguing!
« Last Edit: August 24, 2019, 12:35:54 PM by Jim Hunt »
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Re: The Nares Strait thread
« Reply #2098 on: August 25, 2019, 03:12:25 PM »
SST in Kane basin went down.

Is it reasonable to think that the storm there has mixed the water layers?
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Re: The Nares Strait thread
« Reply #2099 on: August 25, 2019, 04:46:58 PM »
Another thing the storm caused is a huge polynya at the entrance. I'm stunned there are still floes in the strait.
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