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Messages - JayW

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1
Arctic sea ice / Re: MOSAiC news
« on: December 10, 2019, 01:43:33 PM »
Oops, should've specified.  I was looking at this dot on the left. I assumed the one moving due north was the PS.  I was trying to get both in the view


2
Arctic sea ice / Re: MOSAiC news
« on: December 10, 2019, 11:54:36 AM »
RAMMB-SLIDER not updating. :(

Updating again, you can see the icebreaker KD approaching in this shot.
Click to run.

3
Arctic sea ice / Re: MOSAiC news
« on: November 14, 2019, 11:53:35 AM »
This picks up at 0:42Z on the 12th.  There's a 16 hour jump at the beginning due to no imagery available.
Click to run. Contrast boosted for detail.


5
Greenland and Arctic Circle / Re: The Nares Strait thread
« on: November 03, 2019, 11:16:21 AM »

7
Arctic sea ice / Re: The Rammb Slider Thread
« on: October 10, 2019, 11:49:24 AM »
Now that polar night is descending on the arctic, it's time to switch to band I04, shortwave IR discerns temperature.  I inverted the colors and enhanced the contrast, I think it will make for a good substitute for visible bands.  I find the low light band has issues with some form of "glare".

This is the area north of Svalbard at roughly 82.5°N,10°E, that has been discussed before, that "swirl" still evident.   The gif is short, fighting the clouds

Click to run, link to location.
https://rammb-slider.cira.colostate.edu/?sat=jpss&z=5&im=24&ts=1&st=0&et=0&speed=130&motion=loop&map=1&lat=0&opacity%5B0%5D=1&hidden%5B0%5D=0&pause=20191009094722&slider=-1&hide_controls=0&mouse_draw=0&follow_feature=0&follow_hide=0&s=rammb-slider&sec=northern_hemisphere&p%5B0%5D=band_i04&x=16598&y=13956

8
Arctic sea ice / Re: The Rammb Slider Thread
« on: August 27, 2019, 02:53:20 AM »
PGAS/Peary Channel area. August 24-26.

9
Arctic sea ice / Re: The 2019 melting season
« on: August 26, 2019, 12:31:05 PM »
It seems to me that the stall these last few weeks compared to 2012 is mostly due to dispersion. Late August 2012 saw the inner ice a lot more compacted, especially towards the Pacific side.

Dispersion obviously causes higher extent, but then area seems to be stalling as well. But how reliable are the area measurements, particularly with highly dispersed ice under cloudy skies? I don't know.

But it does seem to me that a good "compaction event" on the Pacific side could lose several 100 k's without any extra melt.

And that leads me to wonder if the difference between 2012 and now lies not so much in how much ice has melted as in how it is distributed - admittedly, 2012 had less ice, but the difference probably wasn't nowhere as big as the current extent numbers indicate.

I agree.

72 hour loop. North of the Laptev.
Requires a click. I tried getting the file down as much as possible. Contrast boosted for detail.

10
Arctic sea ice / Re: The Rammb Slider Thread
« on: August 25, 2019, 03:27:07 PM »
 30.5 hour loop, NE Greenland.  375M approximately per pixel.
Click for animation.

11
Arctic sea ice / Re: The Rammb Slider Thread
« on: August 24, 2019, 11:43:15 PM »
Greenland sea 149 hours.

12
Arctic sea ice / Re: The Rammb Slider Thread
« on: August 13, 2019, 11:43:35 AM »
Mobile, isn't it?
Sure seems like it reacts quickly to winds, and it's marching towards the Atlantic, as it has for the most part.

Speaking of winds, they have turned southerly over the Laptev and points north, and should persist for some time.

Contrast boosted.

13
Arctic sea ice / Re: The Rammb Slider Thread
« on: August 11, 2019, 01:51:03 AM »
Glad that it was well received.

Clear skies around the pole today.
Needs click, contrast slightly enhanced for detail.


15
Heavy action in Jøkelbugt (Glacier Bay) notice how the calved icebergs in front or Zachariae Isstrøm are sucked away from the sea ice movements further out:

Better seen here:

Neat how that one pond drained.

16
Arctic sea ice / Re: "Stupid" Questions :o I
« on: August 05, 2019, 01:20:22 PM »
What is the reason that ice, that still linger in Hudson Bay, my intuition tells me, that it should he have melted out by now, which it clearly hasn’t ...

Is this due to lack of mixing/heat transfer, or are we looking at the last of thicker ice, from rindging or som other ice thickening process ?
Are you sure it's there? (I can't look at Worldview at the moment).
If it is, then surely it's the remains of extremely thick ice from ridging. There's enough heat there to melt normal first year ice.

GOES16 saw it there on the 3rd.

http://rammb-slider.cira.colostate.edu/?sat=goes-16&z=5&im=18&ts=2&st=20190803135051&et=0&speed=130&motion=loop&map=1&lat=0&opacity%5B0%5D=1&hidden%5B0%5D=0&pause=20190803191051&slider=-1&hide_controls=1&mouse_draw=0&follow_feature=0&follow_hide=0&s=rammb-slider&sec=full_disk&p%5B0%5D=natural_color&x=9539&y=919

Click to run

17
Arctic sea ice / Re: The Rammb Slider Thread
« on: August 04, 2019, 04:44:56 PM »

Yes, mine is shorter. rammb eats up my broadband volume. Thanks for the links. I definitely couldn't go searching for these.


Here's my effort to make RAMMB a bit more user friendly for those who have internet struggles with the demands of the slider.  I can add more upon request (including gifs if needed and as time allows), note that the "geocolor" and "natural color" appear the most resource intensive. 

I'm providing a list of links to locations around the arctic using band I2 (my favorite), with the minimum number of frames (6), and as a still image.  My hope is that this'll be gentler on this with metered/throttled/slower connections.

These are not the maximum zoom, but can be zoomed in once more.

North Pole lower left, 60°W-30°E
http://rammb-slider.cira.colostate.edu/?sat=jpss&z=4&im=6&ts=1&st=0&et=0&speed=130&motion=loop&map=1&lat=1&opacity%5B0%5D=1&hidden%5B0%5D=0&pause=20190804102542&slider=-1&hide_controls=0&mouse_draw=0&follow_feature=0&follow_hide=0&s=rammb-slider&sec=northern_hemisphere&p%5B0%5D=band_i02&x=16692.4169921875&y=15199.47265625

North Pole upper left, 150°W-60°W
http://rammb-slider.cira.colostate.edu/?sat=jpss&z=4&im=6&ts=1&st=0&et=0&speed=130&motion=loop&map=1&lat=1&opacity%5B0%5D=1&hidden%5B0%5D=0&pause=20190804102542&slider=-1&hide_controls=0&mouse_draw=0&follow_feature=0&follow_hide=0&s=rammb-slider&sec=northern_hemisphere&p%5B0%5D=band_i02&x=16698.4169921875&y=16801.47265625

North Pole upper right, 120°E-150°W
http://rammb-slider.cira.colostate.edu/?sat=jpss&z=4&im=6&ts=1&st=0&et=0&speed=130&motion=loop&map=1&lat=1&opacity%5B0%5D=1&hidden%5B0%5D=0&pause=20190804102542&slider=-1&hide_controls=0&mouse_draw=0&follow_feature=0&follow_hide=0&s=rammb-slider&sec=northern_hemisphere&p%5B0%5D=band_i02&x=15316.4169921875&y=16791.47265625

North Pole lower right, 120°E-30°E
http://rammb-slider.cira.colostate.edu/?sat=jpss&z=4&im=6&ts=1&st=0&et=0&speed=130&motion=loop&map=1&lat=1&opacity%5B0%5D=1&hidden%5B0%5D=0&pause=20190804102542&slider=-1&hide_controls=0&mouse_draw=0&follow_feature=0&follow_hide=0&s=rammb-slider&sec=northern_hemisphere&p%5B0%5D=band_i02&x=15314.4169921875&y=15193.47265625

Kara Sea south
http://rammb-slider.cira.colostate.edu/?sat=jpss&z=4&im=6&ts=1&st=0&et=0&speed=130&motion=loop&map=1&lat=1&opacity%5B0%5D=1&hidden%5B0%5D=0&pause=20190804102542&slider=-1&hide_controls=1&mouse_draw=0&follow_feature=0&follow_hide=0&s=rammb-slider&sec=northern_hemisphere&p%5B0%5D=band_i02&x=13424.388671875&y=12085.361328125

Kara Sea north
http://rammb-slider.cira.colostate.edu/?sat=jpss&z=4&im=6&ts=1&st=0&et=0&speed=130&motion=loop&map=1&lat=1&opacity%5B0%5D=1&hidden%5B0%5D=0&pause=20190804102542&slider=-1&hide_controls=1&mouse_draw=0&follow_feature=0&follow_hide=0&s=rammb-slider&sec=northern_hemisphere&p%5B0%5D=band_i02&x=13230.388671875&y=13707.361328125

Laptev Sea/Lena River delta
http://rammb-slider.cira.colostate.edu/?sat=jpss&z=4&im=6&ts=1&st=0&et=0&speed=130&motion=loop&map=1&lat=1&opacity%5B0%5D=1&hidden%5B0%5D=0&pause=20190804102542&slider=-1&hide_controls=1&mouse_draw=0&follow_feature=0&follow_hide=0&s=rammb-slider&sec=northern_hemisphere&p%5B0%5D=band_i02&x=11990.388671875&y=16609.361328125

Laptev Sea North
http://rammb-slider.cira.colostate.edu/?sat=jpss&z=4&im=6&ts=1&st=0&et=0&speed=130&motion=loop&map=1&lat=1&opacity%5B0%5D=1&hidden%5B0%5D=0&pause=20190804102542&slider=-1&hide_controls=1&mouse_draw=0&follow_feature=0&follow_hide=0&s=rammb-slider&sec=northern_hemisphere&p%5B0%5D=band_i02&x=13690.388671875&y=16701.361328125

East Siberian Sea west
http://rammb-slider.cira.colostate.edu/?sat=jpss&z=4&im=6&ts=1&st=0&et=0&speed=130&motion=loop&map=1&lat=1&opacity%5B0%5D=1&hidden%5B0%5D=0&pause=20190804102542&slider=-1&hide_controls=1&mouse_draw=0&follow_feature=0&follow_hide=0&s=rammb-slider&sec=northern_hemisphere&p%5B0%5D=band_i02&x=12332.388671875&y=18799.361328125

East Siberian Sea east
http://rammb-slider.cira.colostate.edu/?sat=jpss&z=4&im=6&ts=1&st=0&et=0&speed=130&motion=loop&map=1&lat=1&opacity%5B0%5D=1&hidden%5B0%5D=0&pause=20190804102542&slider=-1&hide_controls=1&mouse_draw=0&follow_feature=0&follow_hide=0&s=rammb-slider&sec=northern_hemisphere&p%5B0%5D=band_i02&x=13088.388671875&y=19889.361328125

East Siberian Sea north
http://rammb-slider.cira.colostate.edu/?sat=jpss&z=4&im=6&ts=1&st=0&et=0&speed=130&motion=loop&map=1&lat=1&opacity%5B0%5D=1&hidden%5B0%5D=0&pause=20190804102542&slider=-1&hide_controls=1&mouse_draw=0&follow_feature=0&follow_hide=0&s=rammb-slider&sec=northern_hemisphere&p%5B0%5D=band_i02&x=13510.388671875&y=18583.361328125

Bering Sea
http://rammb-slider.cira.colostate.edu/?sat=jpss&z=4&im=6&ts=1&st=0&et=0&speed=130&motion=loop&map=1&lat=1&opacity%5B0%5D=1&hidden%5B0%5D=0&pause=20190804102542&slider=-1&hide_controls=1&mouse_draw=0&follow_feature=0&follow_hide=0&s=rammb-slider&sec=northern_hemisphere&p%5B0%5D=band_i02&x=13516.388671875&y=22929.361328125

Chukchi Sea south
http://rammb-slider.cira.colostate.edu/?sat=jpss&z=4&im=6&ts=1&st=0&et=0&speed=130&motion=loop&map=1&lat=1&opacity%5B0%5D=1&hidden%5B0%5D=0&pause=20190804102542&slider=-1&hide_controls=1&mouse_draw=0&follow_feature=0&follow_hide=0&s=rammb-slider&sec=northern_hemisphere&p%5B0%5D=band_i02&x=14346.388671875&y=21249.361328125

Chukchi Sea north
http://rammb-slider.cira.colostate.edu/?sat=jpss&z=4&im=6&ts=1&st=0&et=0&speed=130&motion=loop&map=1&lat=1&opacity%5B0%5D=1&hidden%5B0%5D=0&pause=20190804102542&slider=-1&hide_controls=1&mouse_draw=0&follow_feature=0&follow_hide=0&s=rammb-slider&sec=northern_hemisphere&p%5B0%5D=band_i02&x=13516.388671875&y=22929.361328125

Beaufort Sea west
http://rammb-slider.cira.colostate.edu/?sat=jpss&z=4&im=6&ts=1&st=0&et=0&speed=130&motion=loop&map=1&lat=1&opacity%5B0%5D=1&hidden%5B0%5D=0&pause=20190804102542&slider=-1&hide_controls=1&mouse_draw=0&follow_feature=0&follow_hide=0&s=rammb-slider&sec=northern_hemisphere&p%5B0%5D=band_i02&x=16126.388671875&y=20643.361328125

Beaufort Sea east
http://rammb-slider.cira.colostate.edu/?sat=jpss&z=4&im=6&ts=1&st=0&et=0&speed=130&motion=loop&map=1&lat=1&opacity%5B0%5D=1&hidden%5B0%5D=0&pause=20190804102542&slider=-1&hide_controls=1&mouse_draw=0&follow_feature=0&follow_hide=0&s=rammb-slider&sec=northern_hemisphere&p%5B0%5D=band_i02&x=16126.388671875&y=20643.361328125

Beaufort Sea north
http://rammb-slider.cira.colostate.edu/?sat=jpss&z=4&im=6&ts=1&st=0&et=0&speed=130&motion=loop&map=1&lat=1&opacity%5B0%5D=1&hidden%5B0%5D=0&pause=20190804102542&slider=-1&hide_controls=1&mouse_draw=0&follow_feature=0&follow_hide=0&s=rammb-slider&sec=northern_hemisphere&p%5B0%5D=band_i02&x=16344.388671875&y=19117.361328125

CAA - Amundsen Gulf/M'Clure Strait/Viscount Melville Sound
http://rammb-slider.cira.colostate.edu/?sat=jpss&z=4&im=6&ts=1&st=0&et=0&speed=130&motion=loop&map=1&lat=1&opacity%5B0%5D=1&hidden%5B0%5D=0&pause=20190804102542&slider=-1&hide_controls=1&mouse_draw=0&follow_feature=0&follow_hide=0&s=rammb-slider&sec=northern_hemisphere&p%5B0%5D=band_i02&x=18660.388671875&y=20035.361328125

CAA - Prince of Wales Island/Resolute
http://rammb-slider.cira.colostate.edu/?sat=jpss&z=4&im=6&ts=1&st=0&et=0&speed=130&motion=loop&map=1&lat=1&opacity%5B0%5D=1&hidden%5B0%5D=0&pause=20190804102542&slider=-1&hide_controls=1&mouse_draw=0&follow_feature=0&follow_hide=0&s=rammb-slider&sec=northern_hemisphere&p%5B0%5D=band_i02&x=19704.388671875&y=18613.361328125

CAA - Prince Gustav Adolph Sea/Byam Martin Channel/Peary Channel
http://rammb-slider.cira.colostate.edu/?sat=jpss&z=4&im=6&ts=1&st=0&et=0&speed=130&motion=loop&map=1&lat=1&opacity%5B0%5D=1&hidden%5B0%5D=0&pause=20190804102542&slider=-1&hide_controls=1&mouse_draw=0&follow_feature=0&follow_hide=0&s=rammb-slider&sec=northern_hemisphere&p%5B0%5D=band_i02&x=18614.388671875&y=18465.361328125

Parry Channel east/Prince Regent inlet/Admiralty
http://rammb-slider.cira.colostate.edu/?sat=jpss&z=4&im=6&ts=1&st=0&et=0&speed=130&motion=loop&map=1&lat=1&opacity%5B0%5D=1&hidden%5B0%5D=0&pause=20190804102542&slider=-1&hide_controls=1&mouse_draw=0&follow_feature=0&follow_hide=0&s=rammb-slider&sec=northern_hemisphere&p%5B0%5D=band_i02&x=20114.388671875&y=18195.361328125

Baffin Bay north
http://rammb-slider.cira.colostate.edu/?sat=jpss&z=4&im=6&ts=1&st=0&et=0&speed=130&motion=loop&map=1&lat=1&opacity%5B0%5D=1&hidden%5B0%5D=0&pause=20190804102542&slider=-1&hide_controls=1&mouse_draw=0&follow_feature=0&follow_hide=0&s=rammb-slider&sec=northern_hemisphere&p%5B0%5D=band_i02&x=20272.388671875&y=16699.361328125

Baffin Bay south
http://rammb-slider.cira.colostate.edu/?sat=jpss&z=4&im=6&ts=1&st=0&et=0&speed=130&motion=loop&map=1&lat=1&opacity%5B0%5D=1&hidden%5B0%5D=0&pause=20190804102542&slider=-1&hide_controls=1&mouse_draw=0&follow_feature=0&follow_hide=0&s=rammb-slider&sec=northern_hemisphere&p%5B0%5D=band_i02&x=21592.388671875&y=15855.361328125

Nares Strait/Lincoln Sea
http://rammb-slider.cira.colostate.edu/?sat=jpss&z=4&im=6&ts=1&st=0&et=0&speed=130&motion=loop&map=1&lat=1&opacity%5B0%5D=1&hidden%5B0%5D=0&pause=20190804102542&slider=-1&hide_controls=1&mouse_draw=0&follow_feature=0&follow_hide=0&s=rammb-slider&sec=northern_hemisphere&p%5B0%5D=band_i02&x=18364.4453125&y=15877.3056640625

Fram Strait/Greenland Sea
http://rammb-slider.cira.colostate.edu/?sat=jpss&z=4&im=6&ts=1&st=0&et=0&speed=130&motion=loop&map=1&lat=1&opacity%5B0%5D=1&hidden%5B0%5D=0&pause=20190804102542&slider=-1&hide_controls=1&mouse_draw=0&follow_feature=0&follow_hide=0&s=rammb-slider&sec=northern_hemisphere&p%5B0%5D=band_i02&x=17686.4453125&y=13599.3056640625

Svalbard
http://rammb-slider.cira.colostate.edu/?sat=jpss&z=4&im=6&ts=1&st=0&et=0&speed=130&motion=loop&map=1&lat=1&opacity%5B0%5D=1&hidden%5B0%5D=0&pause=20190804102542&slider=-1&hide_controls=1&mouse_draw=0&follow_feature=0&follow_hide=0&s=rammb-slider&sec=northern_hemisphere&p%5B0%5D=band_i02&x=16480.4443359375&y=13325.3056640625

Franz Josef Land/Barents Sea
http://rammb-slider.cira.colostate.edu/?sat=jpss&z=4&im=6&ts=1&st=0&et=0&speed=130&motion=loop&map=1&lat=1&opacity%5B0%5D=1&hidden%5B0%5D=0&pause=20190804102542&slider=-1&hide_controls=1&mouse_draw=0&follow_feature=0&follow_hide=0&s=rammb-slider&sec=northern_hemisphere&p%5B0%5D=band_i02&x=14846.4443359375&y=13313.3056640625

Greenland wide shot - band M8
http://rammb-slider.cira.colostate.edu/?sat=jpss&z=2&im=6&ts=1&st=0&et=0&speed=130&motion=loop&map=1&lat=1&opacity%5B0%5D=1&hidden%5B0%5D=0&pause=20190804102542&slider=-1&hide_controls=0&mouse_draw=0&follow_feature=0&follow_hide=0&s=rammb-slider&sec=northern_hemisphere&p%5B0%5D=band_m08&x=20862.4453125&y=13657.22265625


18
Arctic sea ice / Re: The Rammb Slider Thread
« on: August 04, 2019, 03:12:01 PM »
The RAMMB slider is awesome. The public access is total.
I wish all science was like this.


I can't see you finding anything like slider anywhere else. Three satelliites in geostationary orbit giving you everything all the time.


  I agree with everything you said, and appreciate it.  I just wanted to clarify that the orbits are actually sun-synchronous. Each satellite makes 14 passes a day, taking roughly 102 minutes to complete an orbit.  The ~3,000km wide field of view allows each pass to image from roughly 68° to 5° on the far side of the pole, spanning 28°.  So above 85° is imaged every pass.
  I believe that the slider actually only incorporates two of them, SUOMI and JPSS-1, which orbit opposite each other, giving us 51 minute intervals.  SUOMI is actually beyond its planned 5 year expected lifespan, but more of these satellites are planned over the next decade.

19
Arctic sea ice / Re: The Rammb Slider Thread
« on: August 03, 2019, 10:02:15 PM »
A glimpse through the clouds gave a peak at the Prince Gustav Adolph Sea today.

Just a silly question: Why does the coastline appear twice? Is this ebb/flood change area or the borders of usually fast ice?

This is why i prefer other sat-img-services, depending on the zoom level this can at time cover too many pixels and zooming in is not always an option if one wants to see the big picture.

This is personal preference whatever.

Have you got a better resource for hourly arctic imagery?  I've looked long and hard, and find the rammb slider to offer a unique look.

20
Arctic sea ice / Re: The Rammb Slider Thread
« on: August 03, 2019, 10:00:39 PM »
A glimpse through the clouds gave a peak at the Prince Gustav Adolph Sea today.

Just a silly question: Why does the coastline appear twice? Is this ebb/flood change area or the borders of usually fast ice?
I think it's simply imperfect overlay of coastlines, why there are two, I haven't a clue.  I just know the lines don't exactly match the coasts.  I often toggle then off, but when clouds are present it helps.   I'd also note that the rammb is still in beta I believe.   As blumenkraft mentioned, one can always send feedback and suggestions.

21
Arctic sea ice / Re: The Rammb Slider Thread
« on: August 03, 2019, 01:02:41 AM »
A glimpse through the clouds gave a peak at the Prince Gustav Adolph Sea today.
Click

22
Arctic sea ice / Re: The Rammb Slider Thread
« on: August 02, 2019, 04:03:43 AM »
Similar to the one discussed earlier off Svalbard.
Yep, that one is still making it's daily appearance as well.  I misspoke when I initially posted that one and said it was at 80°N , 5°E, I had the latitude line confused on the slider, it's actually 82.5°N, 5°E.



23
Arctic sea ice / Re: The Rammb Slider Thread
« on: August 02, 2019, 03:42:49 AM »
 
Wind/ cloud effects..

It's a 78 hour loop I posted, and the feature recurs at the same spot, at almost the same time 4 days in a row. That's why I believe it to be related to the tides, the one north of Svalbard also shows a daily rhythm.  I don't see how the clouds and winds would be exactly the same 4 days in a row.  It actually was there the day before that loop as well. 

It was also there in mid July, I think the higher tides surrounding the full/new moons enhances it.

26
Arctic sea ice / Re: The Rammb Slider Thread
« on: July 28, 2019, 02:04:11 AM »
Continuation from the gif in post #150.

I believe the resolution is about 375m /pixel.  I'd say the front moved about 70 pixels, equaling roughly 26km, over the 13.5 hour animation, so about 2km/hour is my guess.  Does it plow straight through? Make a hard left? Or stop in its tracks?. Won't know till tomorrow, and even then, who knows if it'll be clear.

Click it.

27
Greenland and Arctic Circle / Re: The Nares Strait thread
« on: July 27, 2019, 08:56:52 PM »
Stiff winds blowing down the Strait.

28
Arctic sea ice / Re: The Rammb Slider Thread
« on: July 27, 2019, 06:49:46 PM »
I think it might be both winds and melt water pushing in. To me, it looks like you can see sediment rich water moving west through the channel. 
Well the problem with meltwater is that I'm not at all sure that there could be enough of it to cause such a strong movement in a (presumably) deep fjord. But you are right, there is discoloration that follows the ice retreat, possibly just reflecting a change in temperature?

Meltwater would be brown, but the discoloration seems more bluish. Perhaps an extremly rapid spread of algae? I don't know.
Quote
Here is an interesting feature at about 80°N, 5°W.
Very interesting, with those circular movements. Is it the wind doing that, or ocean currents? This Rammb slider thing is really showing us details that I for one didn't know existed.

I don't believe high resolution hourly imagery has been available until they added it to the slider.

I thought of Peyto lake in Canada, and just thought it was fine sediment similar to that.

The swirl at 80°N,5°W looks oceanic to me, as it has appeared the last week or so in the same location at thr same time.  I can't tell how long is been there, as it was too cloudy to see before the 21st.

29
Arctic sea ice / Re: The Rammb Slider Thread
« on: July 27, 2019, 05:41:23 PM »
I think it might be both winds and melt water pushing in. To me, it looks like you can see sediment rich water moving west through the channel. 

Here is an interesting feature at about 80°N, 5°W.  Since the I bands have only been updating a few days, I didn't go back that far, plus it was cloudy, but the feature reappears about the same time the last 4 days and propagates east., making me think it's tide driven.  I'm not sure of the bathymetry.

26ish hour loop, contrast enhanced for detail.
Link to location
http://rammb-slider.cira.colostate.edu/?sat=jpss&z=5&im=36&ts=1&st=0&et=0&speed=130&motion=loop&map=1&lat=1&opacity%5B0%5D=1&hidden%5B0%5D=0&pause=0&slider=-1&hide_controls=1&mouse_draw=0&follow_feature=0&follow_hide=0&s=rammb-slider&sec=northern_hemisphere&p%5B0%5D=band_i01&x=16590.013671875&y=13820.0830078125

Requires click

31
Arctic sea ice / Re: The 2019 melting season
« on: July 20, 2019, 12:18:23 AM »
This is a roughly 90 hour loop, it's a bit jumpy because the RAMMB slider hasn't been updating regularly, and is a shame that the high resolution I bands aren't available as this feature at about 83°N, 35°W north of Greenland would look pretty neat.  Are the ice moves away, a feature has presented itself in the ice floes in the past 48 hours. 

Whirlpool?

Contrast are boosted for detail, converted to video due to large size.

32
Arctic sea ice / Re: The 2019 melting season
« on: July 18, 2019, 11:17:36 AM »
Sincerest condolences Neven.

Re: GAC, I don't think one is a necessity, 5-7 days of persistent winds from the right direction could have a similar effect in my opinion.

33
Arctic sea ice / Re: The 2019 melting season
« on: July 16, 2019, 10:25:18 AM »
Clear skies at the pole.  Shot is centered on the North pole. 30°E is straight up. One pixel is just about 375m.

16 hour loop, "natural color"
Click to run

34
Arctic sea ice / Re: The Rammb Slider Thread
« on: July 14, 2019, 11:37:48 AM »
 Appreciate your interest binntho, as b_lumenkraft mentioned there are likely several/many factors at play.  I'm certainly no expert, but the the counter clockwise motion to me suggests there is some upwelling.  I'm basing this on how the atmosphere works, low pressure is associated with rising air. 
  With so little open water, wind stresses seem to be minimal, but perhaps a southerly flow over the land masses of the CAA *could* result in modest coastal upwelling.
  The most mysterious question to me, is whether these exist under the ice, or do they form only due to the opening.  I haven't a clue.  It'll be interesting to see how they behave going forward.
   I think features like this emphasize the value of these sub daily images available from RAMMB, and am grateful that others, especially b_lumenkraft, have also taken an interest.

35
Arctic sea ice / Re: The 2019 melting season
« on: July 14, 2019, 11:23:18 AM »
17 hour loop centered at roughly 87.8° N, 68° W (I'm approximating here) lat,lon included with last image, latitude line is 87.5°N.  Contest slightly boosted for detail.  Looks like the CAB is forming some stretch marks.  A general motion towards the Atlantic is also seen.
Chick to run.

36
Arctic sea ice / Re: 2019 vs 2012
« on: July 13, 2019, 10:49:57 PM »
Pacific side comparison, July 12.
Chick to run

37
Arctic sea ice / Re: The 2019 melting season
« on: July 13, 2019, 09:42:56 PM »
Attached is the ECMWF surface pressures averaged over the next 5 days. The general flow from north of CAA towards the Laptev could cause some rifting near the pole in my humble opinion.  It's also going to continue pushing CAB ice towards the Atlantic, as ice motion moves to the right of wind direction.  Not worth looking beyond day 5, changes too much.


38
Arctic sea ice / Re: The Rammb Slider Thread
« on: July 13, 2019, 08:56:02 PM »
This shot is centered at roughly 84°N,110°W.  ~18 hours.  Contrast gently enhanced for detail.
A shear line can be seen bisecting the image horizontally.  There's also interesting patches of dark peppered on the left side.  This is band I2.  A general motion towards the Atlantic is also evident.

Click to run

39
Arctic sea ice / Re: The Rammb Slider Thread
« on: July 13, 2019, 04:41:43 PM »
Some eddies have formed in the crack of insignificance north of the CAA, and now that the high resolution I bands are updating regularly, we can see them in better detail.  Some flows can also be seen breaking up a bit as well.
Click to play.

40
Arctic sea ice / Re: The Rammb Slider Thread
« on: July 11, 2019, 01:42:08 AM »
This is M8 band showing the Lincoln Sea at Nares Strait.

This darkening coexistent with the wind pattern on this day.

Doesn't look like ice condition change to me.

Jay, can you comment on what you are seeing here?

I think it's very low clouds and/or fog hugging the ice, and we are seeing warmer and/or drier winds trying to scour it out. 

41
Arctic sea ice / Re: The 2019 melting season
« on: July 10, 2019, 12:16:05 PM »
How common are thunderstorms around the Lena river?  Lena delta in the upper right.
Click to play


42
Arctic sea ice / Re: Arctic Ocean salinity, temperature and waves
« on: July 09, 2019, 01:08:32 PM »
106 hour loop, Chukchi sea, band M15 with colors inverted and increased contrast for detail.  It appears that some of the warmest waters are those that are pushing north, just east of Wrangel Island.

43
Arctic sea ice / Re: When will the Northwest Passage "open" in 2019?
« on: July 06, 2019, 10:10:01 PM »
100 hour loop,, Cornwallis island in the lower right corner.  The tides are doing some work. Pretty sunny as well.


44
Developers Corner / Re: Creating Animated GIFs
« on: July 06, 2019, 03:29:38 PM »
Imagej default rgb and cropped high contrast (clahe 127,4.1)
Is that a plane flying over? No, probably swath edges.

I think that looks nice as a snow/land cover. 
I got tripped up a bit somewhere, I got them into an RGB stack, but it wasn't a gif. Operator error I'm sure.  I'll be practicing with imagej as time allows, I have two small kids running around so it gets tough.   I think I'll stick with screenshots over downloaded images, I am finding the screenshots seem preserve more detail.  I'm gong to revisit the SSTs with a different band, focused on the Chukchi. 

Thanks again, I kinda dig the high contrast. 

46
Developers Corner / Re: Creating Animated GIFs
« on: July 06, 2019, 12:27:49 PM »
This was an interesting spot yesterday. I posted about it in the Petermann thread:

I'm pretty sure it rained there because we obviously had precipitation. On the ice sheet, it fell as snow, but closer to Nares, the temperatures are pretty high atm.

Your post is what made me choose that area.  :)

47
Developers Corner / Re: Creating Animated GIFs
« on: July 06, 2019, 04:06:53 AM »

The how to is posted here https://forum.arctic-sea-ice.net/index.php/topic,1259.msg211015.html#msg211015
Let's continue there so as not to disrupt this thread. Looking forward to the next test.

Here are three short gif around Peterman glacier if you want to give it another go, I figure the landcover there is quite varied, so perhaps something will be interesting.  I will work on learning imagej as time allows.  I tried to keep the files smaller, don't know how to package them in a more efficient manner.

M5
M11
M8

48
Arctic sea ice / Re: The Rammb Slider Thread
« on: July 05, 2019, 12:36:30 PM »
Jayw, thanks for looking at the area suggested, maybe best not to clog up this thread with too many images for now.

My hope was to see something in the oceans, so the result wasn't what I had hoped.  Maybe just not enough gradient. Or, I wonder if the way I constructed the gifs from screenshots, was not the best decision.  I'll give it another shot later today with a different approach and area of ice/snow using different bands, probably I1 - M8 - M11.
 My instinct is that only three bands that display in greyscale have any chance at working (< 4µm), but maybe I'm wrong.  Here's a list of what's available, unfortunately the "atmospheric correction" band seems useless.

Thanks again for humoring me.

49
Arctic sea ice / Re: The Rammb Slider Thread
« on: July 04, 2019, 10:17:08 PM »
create my own RGB composites
If you can provide 3gifs of the same size of exactly the same area with matching timestamps I would be interested to put them together for a test. I'm on metered broadband so I don't play with rammb much.

btw this area east of svalbard looks interesting and quite clear recently. https://go.nasa.gov/325M64G
Worldview with bathymetry inlay
edit: aqua modis is better https://go.nasa.gov/32bUzmK

Here are three. Appreciate your efforts!  ;D
I2 then M12  and M13,  I4 was missing too many frames so I had to use M12.  Depending on the output, I'll provide 3 of the Chukchi, as the arts in that area are interesting, and the skies might be clear for a bit.  I'll do some nearer the pole for snow/ice cover later.  All require a click, and I didn't optimize to preserve as much detail as possible.

Added the link just in case I want to revise the same exact view.
http://rammb-slider.cira.colostate.edu/?sat=jpss&z=5&im=24&ts=1&st=0&et=0&speed=130&motion=loop&map=1&lat=0&opacity%5B0%5D=1&hidden%5B0%5D=0&pause=20190704105857&slider=-1&hide_controls=0&mouse_draw=0&follow_feature=0&follow_hide=0&s=rammb-slider&sec=northern_hemisphere&p%5B0%5D=band_m13&x=15392&y=13145

50
Arctic sea ice / Re: The Rammb Slider Thread
« on: July 04, 2019, 08:57:50 PM »
If you can provide 3gifs of the same size of exactly the same area with matching timestamps I would be interested to put them together for a test. I'm on metered broadband so I don't play with rammb much.

What do you need? 3 different bands? Which ones?

That could be tricky because often times the times don't match. For example, you get more 'day/night' shots per day than 'geo-colours'.
I believe the geo color and natural color are already composites, that's why they take so long to load.

The two combinations I want to try are I2 - M13 - I4. Hoping for a pretty sea surface temp image.
And I1 - M8  - I3 for snow/ice.  My plan was to make a bunch and let uniquorn play with them.

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