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Author Topic: The Nares Strait thread  (Read 572511 times)

blumenkraft

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Re: The Nares Strait thread
« Reply #2100 on: August 25, 2019, 09:31:30 PM »
After storm update.
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uniquorn

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Re: The Nares Strait thread
« Reply #2101 on: August 26, 2019, 12:08:29 AM »
The sea ice does appear to be a bit thin in the Lincoln Sea these days.


johnm33

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Re: The Nares Strait thread
« Reply #2102 on: August 27, 2019, 12:47:16 AM »
" Your comments and thoughts, please."
 Far from shore, I suspect that the pressure gradient between the Arctic and Labrador seas is increasingly being met by deep currents of Atlantic waters making their way around N. Greenland through Nares and into Baffin. If Petermann breaks soon that would add confidence to my thoughts, as the breakout of waters from the north side of Humbolt already has. IF my guess has merit then the surface flows, normally southbound become more prone to tidal, even wind, driven changes. So whilst the ice coming from the north will be driven against the coast of Ellesmere to accelerate it to equilibrium with tangential rotational speed once the surface flow is northbound the ice will switch sides and be slowed down by Greenland.
   

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Re: The Nares Strait thread
« Reply #2103 on: August 28, 2019, 09:35:12 AM »
A very rare sight, the Icebreaker Oden of Sweden, will start the returntrip down Nares Stræde today, after visiting Sherard Osborne Fjord / Ryder Gletscher for more than week, it is the first time I observed a vessel this far north along the northwest coast of Greenland.
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NotaDenier

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Re: The Nares Strait thread
« Reply #2104 on: August 28, 2019, 01:17:39 PM »
A very rare sight, the Icebreaker Oden of Sweden, will start the returntrip down Nares Stræde today, after visiting Sherard Osborne Fjord / Ryder Gletscher for more than week, it is the first time I observed a vessel this far north along the northwest coast of Greenland.

Think we will see it on satellite pictures?

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Re: The Nares Strait thread
« Reply #2105 on: August 28, 2019, 01:24:37 PM »
You
A very rare sight, the Icebreaker Oden of Sweden, will start the returntrip down Nares Stræde today, after visiting Sherard Osborne Fjord / Ryder Gletscher for more than week, it is the first time I observed a vessel this far north along the northwest coast of Greenland.

Think we will see it on satellite pictures?

You will have to ask CIA or someone similar and ask them to turn the "special" resolution on.
But that said, the traces from the Icebreaker could be seen when they were breaking the sea ice in Sherard Osborne Fjord a few days ago.
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blumenkraft

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Re: The Nares Strait thread
« Reply #2106 on: August 28, 2019, 05:08:50 PM »
Oden rocks! \o/

Here you can find the position in real-time btw >> https://oden.geo.su.se/map

They are headed towards Petermann Glacier.
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blumenkraft

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Re: The Nares Strait thread
« Reply #2107 on: August 28, 2019, 05:20:36 PM »
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blumenkraft

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Re: The Nares Strait thread
« Reply #2108 on: August 29, 2019, 05:53:30 PM »
Think we will see it on satellite pictures?

Yesterdays Sentinel shots from the area are cloud-free. I spend an hour or so looking for Oden, but no success. I'm thinking of emailing them and ask for an orange deck paint job!! ;)
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blumenkraft

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Re: The Nares Strait thread
« Reply #2109 on: August 29, 2019, 06:20:27 PM »
Movie time.
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blumenkraft

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Re: The Nares Strait thread
« Reply #2110 on: August 29, 2019, 06:31:40 PM »
Last but not least, Kane Basin.

Mind the gyre.
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blumenkraft

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Re: The Nares Strait thread
« Reply #2111 on: August 30, 2019, 05:52:43 PM »
Hero of the day: Zxy

With their help, i think i found Oden.

Pic 1: A bright spot on 27th where Oden was supposed to be.
Pic 2: A bright spot on 28th where Oden was supposed to be.
Pic 3: A bright spot on 29th where Oden was supposed to be.
Pic 4: Oden location logs (via https://oden.geo.su.se/map/).

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oren

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Re: The Nares Strait thread
« Reply #2112 on: August 30, 2019, 08:58:03 PM »
Bless you blumenkraft. Amazing.

blumenkraft

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Re: The Nares Strait thread
« Reply #2113 on: August 30, 2019, 09:00:33 PM »
Thank you, Oren! :D

Couldn't do it without the link from Zxy though.

PS: Here is the link btw >> https://apps.sentinel-hub.com/eo-browser/?lat=82.181&lng=-60.697&zoom=9&time=2019-08-28&preset=EW-DH-HV-DECIBEL-GAMMA0-ORTHORECTIFIED&gainOverride=14.7&gammaOverride=2.8&redRangeOverride=[0,1]&datasource=Sentinel-1%20AWS%20(S1-AWS-EW-HHHV)
« Last Edit: August 31, 2019, 06:12:57 AM by blumenkraft »
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blumenkraft

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Re: The Nares Strait thread
« Reply #2114 on: August 30, 2019, 09:28:30 PM »
Hmmmmmm

ECMWF models -1˚C. << That was me not paying attention. It was set to a date in the future.  :-[
The actual temperature it was showing was 3˚C.

Oden reports over 6˚C.
« Last Edit: August 31, 2019, 09:41:53 AM by blumenkraft »
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Re: The Nares Strait thread
« Reply #2115 on: August 31, 2019, 05:02:17 AM »
Good find blum.

Hmmm :)
28.1 m/s = (*3.6) 101 Km/h = (*2.25) 63.2 mph    A stiff breeze!

blumenkraft, your sentinel-hub link doesn't work because you missed the final parenthetic bracket in the url.
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blumenkraft

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Re: The Nares Strait thread
« Reply #2116 on: August 31, 2019, 06:16:28 AM »
Good find blum.

Thank you Nanning :)

Quote
Hmmm :)
28.1 m/s = (*3.6) 101 Km/h = (*2.25) 63.2 mph    A stiff breeze!

Indeed. Will go on like that a little more. The polynya might grow even more.

Quote
your sentinel-hub link doesn't work because you missed the final parenthetic bracket in the url.

I think it's the forum software breaking the link. Just copy and paste it. :)
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oren

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Re: The Nares Strait thread
« Reply #2117 on: August 31, 2019, 09:19:27 AM »
Wow. A 100 km/h wind at 6C is a real bitch for ice. I wonder at what height the measurement is taken.

Yuha

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blumenkraft

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Re: The Nares Strait thread
« Reply #2119 on: August 31, 2019, 12:16:08 PM »
According to the logs they have been there around 23:00 (UTC +2).

Great find Yuha!
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blumenkraft

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Re: The Nares Strait thread
« Reply #2120 on: August 31, 2019, 02:05:18 PM »
Played around with the gain and gamma a little. This is the clearest i could get.

Let's go crazy and proclaim you can even see a helicopter flying around.
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blumenkraft

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Re: The Nares Strait thread
« Reply #2121 on: August 31, 2019, 08:24:48 PM »
Lo and behold!

Todays Sentinel (HV - decibel gamma0)
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blumenkraft

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Re: The Nares Strait thread
« Reply #2122 on: August 31, 2019, 09:25:33 PM »
Wat?
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blumenkraft

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Re: The Nares Strait thread
« Reply #2123 on: September 01, 2019, 01:35:09 PM »
Not Oden!
« Last Edit: September 01, 2019, 01:43:05 PM by blumenkraft »
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blumenkraft

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Re: The Nares Strait thread
« Reply #2124 on: September 01, 2019, 05:10:57 PM »
Oden arrived at Petermann!
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blumenkraft

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Re: The Nares Strait thread
« Reply #2125 on: September 01, 2019, 06:16:03 PM »
And again we have a bright spot on Sentinel radar pictures where Oden is supposed to be according to the logs (at Petermann). This should be enough confirmation already that we indeed see Oden here.
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wallen

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Re: The Nares Strait thread
« Reply #2126 on: September 03, 2019, 01:44:07 AM »
Wow, looking at Lincoln Sea. No floes left that you could cork a bottle of wine with, let alone the Nares Strait

blumenkraft

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Re: The Nares Strait thread
« Reply #2127 on: September 03, 2019, 08:24:49 PM »
This is Lincoln only this time.

Made Kane and Kennedy as well, so if someone wants them i can upload them. But there is really nothing to see despite stationary icebergs. Floes are a rare occurrence these days in these regions.
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Re: The Nares Strait thread
« Reply #2128 on: September 04, 2019, 08:35:46 PM »
The ice floes in the upper strait are getting jiggled in by tidal forces. Coriolis force might also play a role. In the RAMMB Slider thread, i posted a GIF where it looks like there is a mellow surface current in the lower strait.
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blumenkraft

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Re: The Nares Strait thread
« Reply #2129 on: September 07, 2019, 04:44:26 PM »
In other news, the Lincoln polynya has closed.
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blumenkraft

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Re: The Nares Strait thread
« Reply #2130 on: September 08, 2019, 03:22:05 PM »
After leaving Petermann, this morning Oden passed Hans reporting

Sun Sep 08 2019 00:30:01 GMT+0200 (CEST)

Vessel speed
8.4 knots
Air temperature
-0.7 °C
Air pressure
1006.2 hPa
Relative humidity
83.4 %
Wind speed
6.0 m/s
Wind direction
127°

Now they are in Kane Basin.
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blumenkraft

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Re: The Nares Strait thread
« Reply #2131 on: September 09, 2019, 08:27:26 PM »
Those static icebergs in Kane Basin are starting to degrade slowly.

You can count floes in Kane with one hand by now.
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blumenkraft

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Re: The Nares Strait thread
« Reply #2132 on: September 10, 2019, 10:20:39 AM »
Oden has left the building.
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blumenkraft

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Re: The Nares Strait thread
« Reply #2133 on: September 11, 2019, 03:45:23 PM »
According to the weather forecast, we'll see strong southward winds in the Strait in the upcoming days. This could lead to export.

Recently, only the tidally driven wiggling pulled some floes inside.
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blumenkraft

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Re: The Nares Strait thread
« Reply #2134 on: September 12, 2019, 03:29:37 PM »
Comparison  ~10th of September in Kane Basin 2016, 2017, 2018, 2019 via Sentinel.
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blumenkraft

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Re: The Nares Strait thread
« Reply #2135 on: September 16, 2019, 09:56:41 AM »
Now that the Kane Basin is almost floe free, we have some export due to southward winds and new floes from the north should arrive soon.

The weather is calmer, for now, even reverses wind direction tomorrow, but new stiff northerly winds are forecasted beginning Thursday, therefore, more export is to expect.

Mercator interestingly models a current.

Edit!
« Last Edit: September 16, 2019, 12:55:15 PM by blumenkraft »
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blumenkraft

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Re: The Nares Strait thread
« Reply #2136 on: September 16, 2019, 10:13:30 AM »
This is a GIF showing 1 ½ month worth of sea surface height (SSH), the last frame is the forecast for the 24th.

I assume the model takes the high over the north pole into account? SSH changes might explain the modeled current?

Exciting times!
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Re: The Nares Strait thread
« Reply #2137 on: September 16, 2019, 12:30:27 PM »
Hi bl .. southward and southerly mean the opposite .. b.c.

 ps I like that you can relay more info in 400 kb than some can in 40,000 ..  ;D
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Re: The Nares Strait thread
« Reply #2138 on: September 16, 2019, 12:49:14 PM »
I like that you can relay more info in 400 kb than some can in 40,000 ..  ;D

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blumenkraft

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Re: The Nares Strait thread
« Reply #2139 on: September 16, 2019, 12:51:41 PM »
.. southward and southerly mean the opposite .. b.c.

That's some useful information, B.C. :D

Thanks for the correction.

Quote
I like that you can relay more info in 400 kb than some can in 40,000

I know some tricks, my friend. ;)
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blumenkraft

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Re: The Nares Strait thread
« Reply #2140 on: September 16, 2019, 03:12:56 PM »
Holy cow, that's a lot of export! 😳

Confined to the right side of the floating direction, so in my assumption, this is not only wind-driven but an actual surface current (as modeled by Mercator - see post above).

Now the question is i guess, has the wind caused the current? Fact is, the wind was stronger in the south end of the channel. Perhaps it caused some kind of undertow.

If so, is this the kickstart for a persistent winter current?

Edit: It came to my attention that users obviously expect an animation when the file is a GIF. The below GIF is not one but a still picture. It's a JPG i converted to GIF for file size reduction. I am very sorry if i confused someone. Your computer is NOT broken.
« Last Edit: September 16, 2019, 05:19:52 PM by blumenkraft »
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blumenkraft

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Re: The Nares Strait thread
« Reply #2141 on: September 16, 2019, 08:08:33 PM »
Sure looks like a surface current to me.

12 frames, 51-minute increments
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blumenkraft

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Re: The Nares Strait thread
« Reply #2142 on: September 17, 2019, 12:13:50 PM »
Some action!

Lincoln & Kane DMI-crop, 11th to 16th, daily increments.
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blumenkraft

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Re: The Nares Strait thread
« Reply #2143 on: September 18, 2019, 07:44:08 AM »
A GIF showing last nights tidal wave can be seen here:


Here i tracked a floe that made a huge leap.
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Re: The Nares Strait thread
« Reply #2144 on: September 19, 2019, 09:25:05 PM »
Some action!

Lincoln & Kane DMI-crop, 11th to 16th, daily increments.
Can the increase of ice cover be explained only by ice drift from CAB or has re-freezing started in that region?

blumenkraft

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Re: The Nares Strait thread
« Reply #2145 on: September 20, 2019, 08:12:52 AM »
There is indeed refreezing in the Petermann fjord and on the northern shores of Kane Basin. But it's so thin that you can't see it in this low-resolution RAMMB or DMI GIFs. The ice you see here is coming from Lincoln.

See these posts, Stephan:

Freeze onset appears clearer on sentinel hub playground

Winter is coming!
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Re: The Nares Strait thread
« Reply #2146 on: September 21, 2019, 07:50:47 AM »
Here we go. First floes enter the Baffin Bay.

Click to play.
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Re: The Nares Strait thread
« Reply #2147 on: September 23, 2019, 01:56:09 PM »
Lincoln not looking healthy, fast refreezing in Petermann Fjord and Kane Basin, a lot of exported ice and what looks like a slowdown of export at the end.
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Re: The Nares Strait thread
« Reply #2148 on: September 26, 2019, 05:01:28 PM »
Probably due to the reversal of the wind direction we have a polynya in Lincoln again.
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Re: The Nares Strait thread
« Reply #2149 on: September 28, 2019, 12:39:48 PM »
Probably due to the reversal of the wind direction we have a polynya in Lincoln again.
Can a reversal cause locking the channel until next year, or too early for that?
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