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Author Topic: Arctic Ocean salinity, temperature and waves  (Read 105287 times)

blumenkraft

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Re: Arctic Ocean salinity, temperature and waves
« Reply #650 on: July 18, 2020, 11:20:47 PM »
So what are we actually seeing in these shots? The water temperature or sediments?

Because if it's the sediments, we can assume river discharge.

JayW

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Re: Arctic Ocean salinity, temperature and waves
« Reply #651 on: July 19, 2020, 12:49:05 AM »
Got every image available in the archive, slim pickings at times. It's unfortunate there is no imagery except day night updating today, clear skies help. Anyhow, I sped it up to help see through the clouds.  Perhaps I'm biased, but I see a plume extending out, but certainly curious as others interpretation. Incidentally, you can see the enhanced cloud/fog formation off the warmest SSTs.
Click, kinda big
« Last Edit: July 19, 2020, 01:09:03 AM by JayW »
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JayW

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Re: Arctic Ocean salinity, temperature and waves
« Reply #652 on: July 19, 2020, 12:51:19 AM »
So what are we actually seeing in these shots? The water temperature or sediments?

Because if it's the sediments, we can assume river discharge.
It is shortwave IR, it's temperature, I've used it with GOES imagery as well.
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blumenkraft

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Re: Arctic Ocean salinity, temperature and waves
« Reply #653 on: July 19, 2020, 08:40:04 AM »
Jay, do you know, which band would be capable of showing the sediments?

JayW

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Re: Arctic Ocean salinity, temperature and waves
« Reply #654 on: July 19, 2020, 10:11:47 AM »
Jay, do you know, which band would be capable of showing the sediments?
Geocolor would likely be best, but a far as individual bands, I've seen high resolution band I1 "red" pick it up (M5 "red" also), and band M4 "green".  Sediment is normally brown, a color combination of red and green, so I'd use one of those.  The green band could also pick up algae as well I'd think.  When toggling though the bands, I'd say green does best.
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blumenkraft

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Re: Arctic Ocean salinity, temperature and waves
« Reply #655 on: July 19, 2020, 10:19:58 AM »
Thanks a lot, Jay!

uniquorn

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Re: Arctic Ocean salinity, temperature and waves
« Reply #656 on: July 19, 2020, 11:26:05 AM »
Salinity at 34m, jul18 2018-2020

JayW

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Re: Arctic Ocean salinity, temperature and waves
« Reply #657 on: July 23, 2020, 01:22:37 AM »
I was making a gif of the Yermak plateau area, but noticed some other interesting motions, hence the wider shot. Hopefully we get another clear day and updating RAMMB...
Click it.
« Last Edit: July 23, 2020, 01:29:54 AM by JayW »
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uniquorn

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Re: Arctic Ocean salinity, temperature and waves
« Reply #658 on: July 23, 2020, 01:30:58 AM »
That is great. Doesn't look like Isn't wind.
Anything further up? FJL?
https://col.st/imkHC (while it is in the archive)
« Last Edit: July 23, 2020, 09:22:49 AM by uniquorn »

johnm33

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Re: Arctic Ocean salinity, temperature and waves
« Reply #659 on: July 23, 2020, 11:51:46 AM »
I'm guessing the low north of FJL enhanced incoming which would cause movement along the slope, the actual water more likely to head for Nares. The tides are still large at Bear Is.

JayW

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Re: Arctic Ocean salinity, temperature and waves
« Reply #660 on: July 25, 2020, 05:51:38 AM »
Band I4, opening north of Ellesmere Island. Heavy contrast.
87 ish hour loop.
Click to run.
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uniquorn

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Re: Arctic Ocean salinity, temperature and waves
« Reply #661 on: July 25, 2020, 11:31:43 AM »
Nice, though I'm not sure what band I4 is showing. Mercator temperature resolution is too low to show much change on the Ellesmere coast yet. Salinity is often a better indicator of up/downwelling. Here is the modelled 0m salinity jul1-24 and 0m temperature, jul18-24

It could just be insolation, probably both.
« Last Edit: July 25, 2020, 11:45:06 AM by uniquorn »

JayW

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Re: Arctic Ocean salinity, temperature and waves
« Reply #662 on: July 25, 2020, 12:06:45 PM »
Nice, though I'm not sure what band I4 is showing. Mercator temperature resolution is too low to show much change on the Ellesmere coast yet. Salinity is often a better indicator of up/downwelling. Here is the modelled 0m salinity jul1-24 and 0m temperature, jul18-24

It could just be insolation, probably both.
It's sensitive to temperatures.  I was thinking insolation was playing a role as well.  The eddies are interesting.
« Last Edit: July 25, 2020, 12:17:55 PM by JayW »
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Re: Arctic Ocean salinity, temperature and waves
« Reply #663 on: July 26, 2020, 11:57:14 AM »
Svalbard on the bottom. I flipped to put north upwards. Band I4 to show the SSTs. Overlayed with snowmelt RGB (blue) to show the ice edge.
Contrast boosted.
Needs click
« Last Edit: July 26, 2020, 12:17:48 PM by JayW »
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uniquorn

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Re: Arctic Ocean salinity, temperature and waves
« Reply #664 on: July 28, 2020, 12:02:20 AM »
Good clear view north of CAA Greenland. Some contrast adjustments.
Signs of rotation in the middle just north of Lincoln
« Last Edit: July 28, 2020, 01:00:49 PM by uniquorn »

FishOutofWater

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Re: Arctic Ocean salinity, temperature and waves
« Reply #665 on: July 28, 2020, 04:23:31 PM »
It's not just some of the thickest ice that will go south through the "garlic press" into oblivion. Some of the fresh water layer at 30m depth is headed for the "garlic press" too.  That 30m salinity animation has a lot of different things going on.

uniquorn

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Re: Arctic Ocean salinity, temperature and waves
« Reply #666 on: July 28, 2020, 08:50:52 PM »
mercator salinity, 34m, mar21-jul27
best viewed at half speed
« Last Edit: July 28, 2020, 09:09:27 PM by uniquorn »

ArcticMelt2

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Re: Arctic Ocean salinity, temperature and waves
« Reply #667 on: July 29, 2020, 03:46:22 PM »
By the way, the storm in Barrow did not weaken much, as before, waves of more than 2 meters in height are observed.

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Re: Arctic Ocean salinity, temperature and waves
« Reply #668 on: July 29, 2020, 08:15:07 PM »
The waves at Barrow have really intensified. Aren't the models cheating about easing the storm?  :P

uniquorn

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Re: Arctic Ocean salinity, temperature and waves
« Reply #669 on: July 29, 2020, 11:01:26 PM »
beaufort/chukchi low for reference

Freegrass

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Re: Arctic Ocean salinity, temperature and waves
« Reply #670 on: July 30, 2020, 08:28:25 AM »
Isn't that water in the Beaufort and the CAB a little too salty?  :-\
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tobiasR

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Re: Arctic Ocean salinity, temperature and waves
« Reply #671 on: July 30, 2020, 12:40:09 PM »
Two active ITP buoys 113 & 114 in the Beaufort sea are worth watching during the storm, both showing a massive mixing event in the form of a decreasing salinity gradient, down to a few hundred meters below sea level. It's destroying the freshwater lens while temps in the upper layers have been increasing. I expect rapid melt out of what's left in Beaufort and Chuckci seas in the coming days.



uniquorn

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Re: Arctic Ocean salinity, temperature and waves
« Reply #672 on: July 30, 2020, 03:18:04 PM »
Too salty? - Don't know. I find it difficult to interpret 0m salinity under ice and after seeing the Tbuoy data I'm not sure that much should be inferred from modelled data. That said, itp114 looks interesting recently, though data starts at 7m depth. Will check it out later.
image removed
« Last Edit: July 30, 2020, 03:44:45 PM by uniquorn »

oren

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Re: Arctic Ocean salinity, temperature and waves
« Reply #673 on: July 30, 2020, 03:21:13 PM »
As it happens, a new user just posted about the same buoys, see above.
Welcome, tobiasR.

glennbuck

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Re: Arctic Ocean salinity, temperature and waves
« Reply #674 on: July 30, 2020, 03:28:40 PM »
DMI, but might not be accurate.

uniquorn

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Re: Arctic Ocean salinity, temperature and waves
« Reply #675 on: July 30, 2020, 03:42:45 PM »
As it happens, a new user just posted about the same buoys, see above.
Welcome, tobiasR.
Welcome indeed!

uniquorn

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Re: Arctic Ocean salinity, temperature and waves
« Reply #676 on: July 30, 2020, 04:14:11 PM »
Perhaps a separate thread for the utqiagvik webcam would be appropriate.

Bruce Steele

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Re: Arctic Ocean salinity, temperature and waves
« Reply #677 on: July 30, 2020, 04:31:24 PM »
tobiasR, If you look at today’s update you can see that the ITP 113 contours has settled down to a more normal profile today. The large upward and downward spike of 31 salinity (halocline) water has changed into a smaller spike that more accurately describes conditions. I think when buoys move too fast the cables that the profiler rides on bang around and send false signals. Today both halocline heat and salinity look to have shoaled another ten meters so that the top of the halocline is about at 25 meters . The other thing you can do is look at the microcat data to help verify what the contours are showing. So although the 113 temp/ salinity contours you posted showed 31 salinity to the surface the microcat at 6 meters shows 26.6 salinity. I would trust the detail of the two microcat sensors over the more broad brush numbers that the temp/salinity contours show especially when there is a weird spike in contours.
 With that all said I think the shoaling of the halocline to twenty five meters is a large jump. More to come as things melt out I believe.
 And welcome aboard !

Normal anticyclonic conditions tend to pull fresh water from ice melt and rivers into the center of the gyre while cyclonic conditions allow some of the accumulated fresh water to flow laterally away from the center. As the surface fresh water moves away from the gyres center the warmer saltier halocline can shoal to a shallower depth. When anticyclonic conditions return the shoaling reverses and the halocline gets shoved deeper while the surface fresh water layer thickens. 
« Last Edit: July 30, 2020, 05:08:06 PM by Bruce Steele »

ArcticMelt2

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Re: Arctic Ocean salinity, temperature and waves
« Reply #678 on: July 30, 2020, 04:35:23 PM »
Perhaps a separate thread for the utqiagvik webcam would be appropriate.

I do not think. There are now many reports of this just because there was a rare powerful storm. Then interest in such observations will quickly subside.

blumenkraft

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Re: Arctic Ocean salinity, temperature and waves
« Reply #679 on: July 30, 2020, 04:39:05 PM »
Perhaps a separate thread for the utqiagvik webcam would be appropriate.

Your wish is my command, Uniquorn.

It's here >> https://forum.arctic-sea-ice.net/index.php?topic=3226.new#new

aslan

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Re: Arctic Ocean salinity, temperature and waves
« Reply #680 on: July 30, 2020, 04:40:10 PM »
It can be noted also that there is a surge event ongoing for the northern coast of Alaska. I don't have knowledge of a station measuring waves height for Arctic coast of Alaska, but at least there is a surge of about 0.5 meters since the 27th of July at Prudhoe. Waves will pill up above, and as sea level is already high, tops of waves reach even higher level. As a side note, waters levels at Prudhoe are higher than in 2012. In 2019 waters levels were even higher than, now, but were not as long lasting.

https://tidesandcurrents.noaa.gov/waterlevels.html?id=9497645&units=metric&bdate=20200725&edate=20200801&timezone=GMT&datum=MLLW&interval=6&action=

aslan

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Re: Arctic Ocean salinity, temperature and waves
« Reply #681 on: July 30, 2020, 05:28:53 PM »
For ITP 113 and 114 there is also the question of temperature. The cold pool at the surface was definitively mixed, as temperature surged at surface.

prokaryotes

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Re: Arctic Ocean salinity, temperature and waves
« Reply #682 on: July 30, 2020, 06:06:09 PM »
It can be noted also that there is a surge event ongoing for the northern coast of Alaska. .. at least there is a surge of about 0.5 meters since the 27th of July at Prudhoe. Waves will pill up above, and as sea level is already high, tops of waves reach even higher level. As a side note, waters levels at Prudhoe are higher than in 2012. In 2019 waters levels were even higher than, now, but were not as long lasting.
Notice that the region just about 100 km farther westerly is a known hot spot for coastal erosion, consisting of permafrost soils - see below footage of Drew Point coastline damage...

https://youtu.be/b27eXPialt4?t=472
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uniquorn

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Re: Arctic Ocean salinity, temperature and waves
« Reply #683 on: July 30, 2020, 07:24:05 PM »
7m temperatures have been slowly rising since ~day170 (jun18). I think that is due to insolation.
During recent days the profiler has often been unable to rise above 250m, probably due to high drift speed. I don't know the reason for the recent drop in temperature at 5m, mixing down to 25m?

uniquorn

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Re: Arctic Ocean salinity, temperature and waves
« Reply #684 on: July 30, 2020, 08:15:56 PM »
whoi itp114 7-250m, a bit longer due to interesting profile change on day136.  Also a short ani of recent salinity down to 800m to show profiler struggling.
Thicker lines, bigger titles on these :)
« Last Edit: July 30, 2020, 08:56:10 PM by uniquorn »

tobiasR

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Re: Arctic Ocean salinity, temperature and waves
« Reply #685 on: July 30, 2020, 08:33:01 PM »
Thanks uniquorn & Bruce for the correction, I got a little over excited there :) I looked at the data files and there's indeed missing profiles last few days for 5-200m depth so it's just filling in colours.

uniquorn

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Re: Arctic Ocean salinity, temperature and waves
« Reply #686 on: July 30, 2020, 10:53:06 PM »
Good clear view north of CAA Greenland. Some contrast adjustments.
Signs of rotation in the middle just north of Lincoln
Following up on rotation north of Lincoln Sea

uniquorn

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Re: Arctic Ocean salinity, temperature and waves
« Reply #687 on: August 03, 2020, 11:20:51 PM »
update on rotation north of Lincoln. Here using worldview aqua and terra interleaved, jul21-aug3.
slight contrast enhancement.

Also posting some surface net downward shortwave flux differences for reference, 202006 minus 201206 to 201906. Note that the scale is -100to100

uniquorn

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Re: Arctic Ocean salinity, temperature and waves
« Reply #688 on: August 05, 2020, 01:12:33 PM »
Deep Flow Variability Offshore South-West Svalbard (Fram Strait)
Quote
Abstract:
Water mass generation and mixing in the eastern Fram Strait are strongly influenced by the interaction between Atlantic and Arctic waters and by the local atmospheric forcing, which produce dense water that substantially contributes to maintaining the global thermohaline circulation.
The West Spitsbergen margin is an ideal area to study such processes. Hence, in order to investigate the deep flow variability on short-term, seasonal, and multiannual timescales, two moorings were deployed at ~1040 m depth on the southwest Spitsbergen continental slope. We present and discuss time series data collected between June 2014 and June 2016. They reveal thermohaline and current fluctuations that were largest from October to April, when the deep layer, typically occupied by Norwegian Sea Deep Water, was perturbed by sporadic intrusions of warmer, saltier, and less dense water. Surprisingly, the observed anomalies occurred quasi-simultaneously at both sites, despite their distance (~170 km).
We argue that these anomalies may arise mainly by the effect of topographically trapped waves excited and modulated by atmospheric forcing. Propagation of internal waves causes a change in the vertical distribution of the Atlantic water, which can reach deep layers. During such events, strong currents typically precede thermohaline variations without significant changes in turbidity. However, turbidity increases during April–June in concomitance with enhanced downslope currents. Since prolonged injections of warm water within the deep layer could lead to a progressive reduction of the density of the abyssal water moving toward the Arctic Ocean, understanding the interplay between shelf, slope, and deep waters along the west Spitsbergen margin could be crucial for making projections on future changes in the global thermohaline circulation

Introduction
Water masses in the eastern Fram Strait, strongly influenced by the interaction between Atlantic
and Arctic waters and by local atmospheric forcing, substantially contribute to drive the global
thermohaline circulation [1–4]. There is a remarkable variability in the system due to several
forcing mechanisms (e.g., atmospheric, internal, tidal, shelf dynamics) that play an important role,
especially in the upper layer [5–10]. On the contrary, it is not completely clear which processes are responsible for the inter-annual and seasonal deep flow variability in the western offshore Spitsbergen region
« Last Edit: August 05, 2020, 11:55:05 PM by uniquorn »

uniquorn

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Re: Arctic Ocean salinity, temperature and waves
« Reply #689 on: August 05, 2020, 02:57:46 PM »
mercator(model) current at 34m depth, mar21-aug4
best viewed at half speed ;)

uniquorn

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Re: Arctic Ocean salinity, temperature and waves
« Reply #690 on: August 06, 2020, 12:02:53 AM »
Delaunay triangulation of a selection of iabp buoys day90-218, ~2days/sec
will probably replace with a smaller version
Will have to check that dropout, Octave delaunay not happy with 3 buoys in a row perhaps.
Possible eddies in the Beaufort. Best viewed at 2x speed.
Only a couple of the buoys are mosaic.
« Last Edit: August 06, 2020, 12:21:34 AM by uniquorn »

uniquorn

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Re: Arctic Ocean salinity, temperature and waves
« Reply #691 on: August 08, 2020, 11:05:58 AM »
nice image from earth observatory of the arctic low from jul28 for reference. Full size image here

JayW

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Re: Arctic Ocean salinity, temperature and waves
« Reply #692 on: August 08, 2020, 04:07:08 PM »
Yermak plateau area.  Contrast increased. Needs a click.
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uniquorn

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Re: Arctic Ocean salinity, temperature and waves
« Reply #693 on: August 08, 2020, 06:55:57 PM »
Thanks JayW. Been wanting that for ages :)
Even more active than I imagined. 280km from nearest land. I think that's 82.5N which puts the eddy near the white blob.  https://col.st/5Us0O (available for a while)
« Last Edit: August 08, 2020, 07:46:07 PM by uniquorn »

uniquorn

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Re: Arctic Ocean salinity, temperature and waves
« Reply #694 on: August 08, 2020, 08:27:07 PM »
I remember you found this last year
82.5N is the northern edge of the Yermak plateau and the waves appear rotational above the plateau, spreading north over deeper water. Based on repeated views of lower concentration ice over this area on amsr2 there is a lot of mixing in this area. That looks like upwelling on a grand scale.
Mosaic buoys showed cyclic movement over this area suggesting a tidal influence.
The evidence is becoming overwhelming.
« Last Edit: August 08, 2020, 08:54:09 PM by uniquorn »

johnm33

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Re: Arctic Ocean salinity, temperature and waves
« Reply #695 on: August 08, 2020, 09:52:04 PM »
I think it's rotation says it's heading south so my guess was here, be nice to know for sure.
Thanks  :)
« Last Edit: August 09, 2020, 10:22:49 PM by johnm33 »

uniquorn

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Re: Arctic Ocean salinity, temperature and waves
« Reply #696 on: August 09, 2020, 09:18:01 PM »
20200807 eddy centre starts at around 82.5N 9E, moves a little north and to ~13E
81.3N is close to the ice edge.
Worldview shows it at around 82.57N 5.26E on aug7 https://go.nasa.gov/2XLHTCF
That's a trip along 2/3 of the plateau northern edge 
« Last Edit: August 09, 2020, 09:40:50 PM by uniquorn »

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Re: Arctic Ocean salinity, temperature and waves
« Reply #697 on: August 09, 2020, 10:54:43 PM »
Thanks JayW. Been wanting that for ages :)
Even more active than I imagined. 280km from nearest land. I think that's 82.5N which puts the eddy near the white blob.  https://col.st/5Us0O (available for a while)
I agree, seems more expansive than what we saw last year.  Wonder if it's due to ice thickness, perhaps due to the higher tide cycle,  interesting for sure.   I see it starting at roughly 7°E.  I see a separate feature at 81.3°N at the ice edge that I don't see is directly related.

Sverdrup channel using I4 with snow RGB for ice.  Relatively warm water being input from the fjords.
Contrast and brightness boosted. Click to run.
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uniquorn

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Re: Arctic Ocean salinity, temperature and waves
« Reply #698 on: August 09, 2020, 11:20:20 PM »
Thanks. A good reason for the quick melt. Also coming from the north by the looks of it. Maybe from Nansen Sound, though I thought the current there was supposed to be south.

Bookmarking A-Teams post for ref
« Last Edit: August 10, 2020, 12:03:23 AM by uniquorn »

uniquorn

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Re: Arctic Ocean salinity, temperature and waves
« Reply #699 on: August 11, 2020, 09:50:12 PM »
mercator 0m temperature(SST) with amsr2-uhh overlay, jun1-aug10
used 'lighten only' in gimp for a test. Labels are much better
Best viewed at half speed.
« Last Edit: August 11, 2020, 10:10:17 PM by uniquorn »