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Messages - JayW

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51
Arctic sea ice / Re: The Rammb Slider Thread
« on: July 14, 2020, 09:01:34 PM »
I tried that too.

It would be awful losing this tool.

 :'(

Good and bad news.  The bad is, there still issues, but it's being worked on.  But some is updating.
   
The response.
Quote
Regarding the JPSS imagery, we have multiple issues that have been causing the sporadic data lately. There seems to be a new bottleneck somewhere upstream from CIRA that we haven't yet been able to getto the bottom of, which is leading to us not getting all the imagery we normally do. Then, this past weekend, there was a power outage in one of our server rooms that took everything down. While the power outage issues have been resolved, one of my colleagues is hard at work trying to get the upstream data feed working as well as it had been before.

52
Arctic sea ice / Re: The Rammb Slider Thread
« on: July 14, 2020, 12:19:01 PM »
Well, I give up.  I sent the last email I will to the RAMMB webmaster.  Is been two weeks of either none, or basically unusable imagery.  I'll make one last plea to anyone in the academic community to please reach out, and see if there's any plan to continue offering polar satellite imagery.  It's experimental, so there was never a guarantee that it would be maintained.  Shitty day night imagery is of little value to me.

53
Arctic sea ice / Re: The Rammb Slider Thread
« on: July 13, 2020, 12:11:15 AM »
Whole site is down, bummer, guess it's not manned on weekends.  My guess it comes back on around 5z tomorrow.

54
Arctic sea ice / Re: The 2020 melting season
« on: July 11, 2020, 12:07:37 PM »
925mb temperature anomaly for the first 8 days of July.

55
Arctic sea ice / Re: The 2020 melting season
« on: July 11, 2020, 11:25:05 AM »
You’re welcome Blumenkraft  :) it’s easier to know when you’re from an ice climbing background since most ice that is formed in a non glacier environment is from freeze and thaw, on the other hand I didn’t know that glaciers were created by compression until a couple years ago, so you win some, you lose some
"Bluing" of ice crystals is a result of going from smaller to larger crystals. The larger the crystal, the more red light is absorbed.

56
Arctic sea ice / Re: The 2020 melting season
« on: July 11, 2020, 10:30:12 AM »
12 hour loop using snow RGB, the darker the red, the wetter it is.  Requires a click.  Second is AMSR2 concentration, rotated to match.  I often hear it stated that water vapor laden clouds cause an apparent decrease in concentration, I don't see it that way.  Sometimes the sensor picks up the wet surface from rain underneath.  My experience is that cloud cover almost always creates an apparent increase in concentration.



57
Arctic sea ice / Re: The Rammb Slider Thread
« on: July 11, 2020, 03:26:28 AM »
More CAA, lots of areas starting to break up. Tides doing some work.
Click it

58
Arctic sea ice / Re: The Rammb Slider Thread
« on: July 10, 2020, 12:24:57 PM »
Fjords and sounds south of Nansen sound appear to be breaking up.
Most recent image.

59
Arctic sea ice / Re: The Rammb Slider Thread
« on: July 10, 2020, 01:16:56 AM »
Hopefully we get some reliable imagery, been frustrating.
M'Clure Strait/Parry channel, click to run.


60
Greenland and Arctic Circle / Re: The Nares Strait thread
« on: July 07, 2020, 12:54:27 AM »
12.5 hour loop
Click to run.

61
Arctic sea ice / Re: The 2020 melting season
« on: July 06, 2020, 12:42:49 PM »
 10 day ice coverage delta from the ECMWF (requires a click).  Second attachment is the forecast for today from from 10 days ago.
https://weather.us/model-charts/euro/2020062612/north-pole-zoom1/ice-ocean-lake/20200706-1200z.html


62
Arctic sea ice / Re: The Rammb Slider Thread
« on: July 03, 2020, 01:40:50 PM »
Still not updating and my emails haven't been responded to.   Frustrating that it seems like like care is paid to the polar orbiting satellites.  Perhaps some other members could email the webmaster. Preferably someone with an email from a university orvthe like, as that might elicit a response.   
Thanks

63
Arctic sea ice / Re: The 2020 melting season
« on: July 01, 2020, 12:16:18 PM »
8 DEG C SITTING IN THE LAPTEV.

2 day loop, Lena delta in lower left, requires a click.  Shortwave infrared. Contrasted boosted for detail.

64
Arctic sea ice / Re: The caa-greenland mega crack
« on: July 01, 2020, 10:28:00 AM »
RAMMB stuck again?
Appears that way, I fired over a email just now.  Hopefully it helps.

65
Arctic sea ice / Re: The caa-greenland mega crack
« on: July 01, 2020, 10:17:05 AM »
Thanks JayW .. the moment has been lost now from Worldview .. but you have captured it beautifully .. bc
There is also a rapid and significant darkening of the ice picked up by the visible bands, likely due to warming air descending of the landmass and blowing over the ice.  Shows up in AMSR2.

66
Arctic sea ice / Re: The caa-greenland mega crack
« on: July 01, 2020, 01:59:30 AM »
There was a lift-off of the ice East of Alert around to the Nares enterance . It can be seen best on Worldview atm as you zoom in @ 50km/50ml a.. as you zoom closer the frame changes to showing cracking but the departure from shore is no longer clear .
  Lincoln is an amazing zone of shear , disintergration and melting of what looked like the safest ice in the Arctic only 2 weeks ago .
         +++             It's now gettin' ground up like salt in situ !  b.c.
As it happened. Click to run.

67
Arctic sea ice / Re: The Rammb Slider Thread
« on: July 01, 2020, 01:38:59 AM »
jay, bl, If you have time, I'm struggling to get a good quality rammb of the eddies around the yermak plateau.

Today was the only day it was really clear enough, I'll make another tomorrow if it is clear again. I used band I2. Let me know if you want anything adjusted.

70
Greenland and Arctic Circle / Re: The Nares Strait thread
« on: June 27, 2020, 09:00:07 PM »
Last image ~2.5 hours old. West side looks like it's going to me.
You know the drill.

73
Arctic sea ice / Re: The Rammb Slider Thread
« on: June 25, 2020, 12:36:16 PM »
24 hour loop.  The big storm dropped little snow, some just to the North American side of the pole, and the Beaufort might have received a dusting.  Mostly rain however in my humble opinion.  One can see the cyclonic curvature of the rain bands in the latest AMSR2 microwave shot. 2nd attachment


74
Arctic sea ice / Re: The Rammb Slider Thread
« on: June 25, 2020, 05:29:17 AM »
Thanks, Jay! :)

It's working again!
Correlation may not be causation.   :)  but maybe my reminder helped, I didn't get a response, so who knows.

A look at the current around Utqiagvik.

75
Arctic sea ice / Re: Nullschool Forecasts
« on: June 25, 2020, 01:37:10 AM »
Latest Five Day Forecast
Wind + Temp @ Surface
Should do a number on the Chukchi.

76
Arctic sea ice / Re: The Rammb Slider Thread
« on: June 23, 2020, 11:37:57 AM »
I sent an email to the RAMMB webmaster about imagery not updating the last 2-3 days, hopefully there's a response, or things start updating again.

I did find a neat blog post about the new RGB bands which gives some information about them.  The importance of band M8, which we figured out last season is discussed.

http://rammb.cira.colostate.edu/projects/npp/blog/

77
Arctic sea ice / Re: River ice and Discharge
« on: June 20, 2020, 09:13:23 AM »
Edit: forgot to say it's the Lena river delta, in case it wasn't clear.
Roughly 84 hour loop.  Contrast boosted.  I'll speculate further.  Looks to me like the ocean current is the main driver, especially with more ice cover.  I do see what looks like a small tidal influence, but it's not driving things.  However as the ice melts and/or gets pushed out, the winds are playing an increasing role.  As theopen water expands, I'll zoom out to see how the water is spreading into the Laptev.  One last note, and this is highly speculative, but the sediment rich water spilling out appears to warm with the heating of the sun.

Click to animate.

78
Arctic sea ice / Re: The 2020 melting season
« on: June 17, 2020, 12:28:43 PM »

So why make a statement if you can't quantify it? Rain in the Arctic is not unusual(especially these days) and I can't tell how if there's been more rainfall or not, not sure anyone can.

What you can say though, the ice in the ESS is terrible, 2017 was low also but there was less heat and the ice looks a bit thicker than it does now. How much of that ice in the ESS willl be there by July
I think it's relevant is all.  I'll attempt to quantify.
1000mb Specific humidity anomaly for the selected years 2012, 2016, 2019, 2020.

79
Arctic sea ice / Re: The 2020 melting season
« on: June 17, 2020, 11:04:43 AM »
The effects of that heat on the ice are increasingly apparent.

Two screen shots, one ESS/Chukchi and the other ESS/Laptev.

Bright blue over large stretches, and serious browning across the Chukchi in particular, which in the past I've found is a specific signal of ice starting to disintegrate rapidly.
I can't quantify this, but I don't remember seeing as much rain fall on the ice as we've seen this past 6 weeks.  I'd love to see how 2m dew points over the ice compare to past years, but can't find that data.

80
Arctic sea ice / Re: Arctic Ocean salinity, temperature and waves
« on: June 17, 2020, 02:06:19 AM »
A one week look at the Bering Strait and Chukchi using band I4 shortwave.  The clouds and daily jump are a bit distracting, but one can see the warm Chukchi waters reading into the pack, as well as Bering inflows.
I reversed the colors to make it easier on the eyes.
Click to run.

81
Arctic sea ice / Re: The 2020 melting season
« on: June 16, 2020, 12:10:38 PM »
More fast ice breakup today. In the Laptev sea near the Lena river delta, and in the western ESS.

Possible all the fast ice in the area of the New Siberia Islands has cracked. This is evidenced by the microwave image. Does anyone have radar images of this area?
Snowmelt RGB from RAMMB shows the ice largely intact as of a few hours ago, but that it's likely covered in water from rain and melt. Some cracks can be seen at bottom (west).


82
Arctic sea ice / Re: The Rammb Slider Thread
« on: June 15, 2020, 02:51:21 AM »
Lena river outlet in the upper right.  These look like thunderstorms bubbling up and moving towards the arctic shores.  Three also a line of likely thunderstorms in my opinion, associated with a front moving across the Lena.  Hopefully we get some clearing afterward, and are able to see the discharge.
Click to run.

83
Arctic sea ice / Re: River ice and Discharge
« on: June 13, 2020, 01:12:14 PM »
Perhaps the most interesting aspect of this discharge is the strong current along the coast - could it be wind driven?

EDIT: Having taken a closer look, it's clear that the current is to the west at beginning, but reversing towards the end of the animation. Could this be tidal movement?  :-X
As soon as we have consecutive cloud free days in the area, I'll post a loop.  I'm not sure the animation I posted is long enough to be too sure.
  Initial thoughts would be ocean driven current that's modulated by tides.  Not sure there's quite enough open water for wind driven currents yet,  but I can't say with any certainty.
Edit: having said that,  a westerly wind at the ice edge there could be creating this effect.  I won't speculate further until we see more of it.

84
Arctic sea ice / Re: River ice and Discharge
« on: June 12, 2020, 11:12:31 AM »
Shortwave infrared bands on VIIRS shows the Lena river is now flowing into the Laptev, albeit in one little spot.

Contrast boosted for detail, click to run.

85
Arctic sea ice / Re: The 2020 melting season
« on: June 12, 2020, 10:54:19 AM »
, but not having strong winds in that dipole makes it not as bad as it could have been with wind above 40 km/h over the CAB. That would have ripped the ice appart I think. Am I wrong about that?


I'm not sure it's so simple.  When discussing wind power, strength matters, but fetch and especially persistence matter.  It also matters what's is blowing over.  Wind over cohesive and tightly packed ice floes will not have the same effect as over dispersed floes and open water.  The forecasts show a prolonged episode of wind generally blowing from the ESS/Laptev towards Greenland.  As this occurs, I'd expect the ESS and especially the Laptev to open up further.  The smaller floes will be moved faster than the pack, so they will begin to pile up against the main pack eventually, creating a bit of a "melt front" as the open water expands in the Laptev.  Most of the melting would occur at this front as its increasingly exposed to open seas, while transporting the larger floes in the direction of Greenland.

86
Arctic sea ice / Re: The Rammb Slider Thread
« on: June 12, 2020, 12:52:50 AM »
Near shore ice in the Laptev has turned quite the shade of blue on snowmelt RGB.   

88
Arctic sea ice / Re: The 2020 melting season
« on: June 08, 2020, 11:21:02 AM »
925 mb temp anomalies for May 1- June 5 in the selected years 2012, 2016, 2019, 2020. 
   Just a couple thoughts as I avoid this thread and really only concentrate on RAMMB, and its ability to tell a story about the quality of the ice, which is oft overlooked for quantitative side.
   In past years with early opening of the Beaufort it was due to transport, not melt. The gyre is basically dead as A-team has been saying for years.  It's likely rained quite a bit there, as well as large swaths of the arctic, in my humble opinion.
   Area and extent numbers tend to "breath" during a season, sometimes because of sensors being fooled, sometimes by the vagaries of weather.  Extrapolating out using recent short term data has the ability to lead one astray.
  I'll sit back and watch, because there's a lot to learn in each season.

89
Arctic sea ice / Re: The 2020 melting season
« on: May 25, 2020, 12:57:24 PM »
60 hour loop of the Beaufort/Chukchi area. Snowmelt RGB composite from the RAMMB slider.  My opinion is that this suggests it's been raining to the NW of Utqiagvik. Darker blue means more melting.

https://rammb-slider.cira.colostate.edu/?sat=jpss&z=2&im=18&ts=1&st=0&et=0&speed=130&motion=loop&map=1&lat=0&opacity%5B0%5D=1&hidden%5B0%5D=0&pause=20200525021733&slider=-1&hide_controls=0&mouse_draw=0&follow_feature=0&follow_hide=0&s=rammb-slider&sec=northern_hemisphere&p%5B0%5D=cira_snowmelt&x=15887.22265625&y=19045.6669921875

 Converted to mp4 for smaller file size.

90
Arctic sea ice / Re: The 2020 melting season
« on: May 23, 2020, 10:12:33 PM »
925mb temp anomaly for the first 3 weeks of May.

91
Arctic sea ice / Re: The Rammb Slider Thread
« on: May 23, 2020, 01:31:17 PM »
Just noticing now that the RAMMB added a bunch of awesome RGB composites after seeing some of blumenkraft's posts.

Beaufort is responding to easterly winds.  Should open up nicely over the next 3 days.
Band M8 showing quite varied snow quality, mostly not very fresh.  You can also see the warm surging up north, in the last frames.  Floes look pretty small, except maybe the ones near Banks island, and even those look a bit dodgy.
A short 10 loop, contrast boosted. Click to run.

92
Arctic sea ice / Re: The Rammb Slider Thread
« on: May 17, 2020, 12:24:03 PM »
Shot centered a roughly 68°N, 154°E.   4 day change.  Kolyma river in the lower left can be seen thawing, might start spilling out the delta and onto the fast ice soon.  One can also see several "kettle ponds?" melting out, as well as some reduction in snowcover.
Link to location.
https://rammb-slider.cira.colostate.edu/?sat=jpss&z=5&im=14&ts=1&st=0&et=0&speed=130&motion=loop&map=0&lat=1&opacity%5B0%5D=1&hidden%5B0%5D=0&pause=20200517030756&slider=-1&hide_controls=1&mouse_draw=0&follow_feature=0&follow_hide=0&s=rammb-slider&sec=northern_hemisphere&p%5B0%5D=eumetsat_natural_color&x=11169.013671875&y=19222.083984375

Requires a click.

93
Arctic sea ice / Re: The Rammb Slider Thread
« on: May 16, 2020, 01:34:57 PM »
Southern Chukchi, 100 hours. Band I1.

94
Arctic sea ice / Re: The Rammb Slider Thread
« on: May 06, 2020, 12:19:40 PM »
VIIRS band M8 indicating a change in snow characteristics stretching from just north of Wrangel Island to Banks island.  It occurs just south of a storm track so my feeling is that's it's due to precipitation.  It coincides with the AMSR2 concentration data from Bremen. Second attachment.
Click to run. Contrast boosted for detail.


95
Arctic sea ice / Re: The Rammb Slider Thread
« on: May 01, 2020, 12:13:36 PM »
Lots of clouds over the ESS, but glimpses show a little fresh snow in areas, but it appears to me that much of the existing snowcover isn't all that impressive.

Band M8. Needs click

96
Arctic sea ice / Re: The Rammb Slider Thread
« on: April 29, 2020, 12:17:34 PM »
A beautiful example of how you can spot fresh snow via M10 Band.

The location is between Greenland and Svalbard. 20 frames. Click to play.
It also tells us something about the existing snowpack not being being fresh, and having potentially seen *some* above freezing temps. 

97
Arctic sea ice / Re: The Rammb Slider Thread
« on: April 21, 2020, 01:28:01 AM »
Band M8 showing a change in snow consistency over the Laptev.  This is either rain or wet snow in my humble opinion.
Click to run. Roughly 36 hours.

98
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


99
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.

100
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.


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