Support the Arctic Sea Ice Forum and Blog

Show Posts

This section allows you to view all posts made by this member. Note that you can only see posts made in areas you currently have access to.

Messages - johnm33

Pages: [1] 2 3
Arctic sea ice / Re: The 2019/2020 freezing season
« on: January 15, 2020, 04:13:56 AM »
Hi all,

As an amateur observer, I've paid quite close attention to the Arctic this season, so maybe others can elaborate on some things i've noticed.

1) Cyclones in the North Atlantic. For the last 2-3 weeks, deep developing cyclones have been a constant. A couple have reached 940mbar, real monsters. Pulling right down the Greenland current, and undoubtedly affecting Arctic inflow with Atlantic water. Sidenote: I have to imagine these winds and 15m waves hitting Greenland, probably has some affect on underwater melting via mixing?

2) Incoming collapse of the Beaufort High. The typical anti-cyclonic gyre wind and pressure is getting increasingly encroached by cyclonic low-pressure. I don't know enough about this, but the research i've seen has insinuated the effect on ice formation in the Pacific ice, Beaufort/Chukchi/ESS, but can also affect the CAA.

Zack Labe actually had a picture in the melting season, that showed the significant meridional anomaly right up the Bering for the year (pic link right below). I'm guessing it was the high pressures from the Pacific contrasting with the Aleutian lows. I haven't watched enough years for precedent data, but there's also been some cyclone formation closer to the land masses on the Pacific this winter season. That can advect some real warmth.

And just my opinion, but baroclinity and cyclone formation + the low pressure patterns they arise from (and contrasting high pressures) with baroclinity differences seem like they may be understated in the grand scheme of things. We've seen the effect in late summer, the effect it can have over the Barents, and the water flow + advection they can perform, which could serve to only exacerbate the situation. Long term, anyway.

The US has also been getting hit by severe weather, and more coming the next 5-7 days. So if you're interested in snow extent, snow depth, etc, may want to check on that the next week. There was also a minor chance of a vortex disruption, but who knows. The last few have occurred around early February for US weather, I believe.

Arctic sea ice / Re: MOSAiC news
« on: December 29, 2019, 11:55:48 PM »
Two significant new offerings at Meereis Portal: the interactive buoy GIS display discussed earlier in #437 and release of sea ice motion radar cam scenes looking out from the Polarstern bridge  (link in #454).

Note the comparable radar on the antique RV Lance digitized an image a minute with a 360º view and range of 9 km during N-ICE2015 whereas with Mosaic the 280º field of view excludes the Ice Cam, reports every six hours (ie at 1/360 the frame rate) with only 5.2 km of range.

Note the 06:00 daily nadir S1AB coincides with the 06:00 oblique ship radar, meaning the two cannot be color-composited though the Sentinel at 200% can fill in the missing ice camp (2nd image).

We looked at marginal ice zone action and a radar cam article back in #83:

Presumably the PS has more sophisticated radar than they're letting out because you can buy better recreational boating radar for a few $k on ebay. The blackout on the Ice Camp could plausibly be attributed to rfi with all the other equipment out there. Dedicated instruments and strain panels monitor conditions there but that data has not been shared except anecdotally (and via S1AB analysis here). 

The full dataset is sent daily over the Polarstern's fast internet (still being denied on Dec 27th) to Bremerhaven where it is bundled into rolling windows of two weeks extent (14 days x 4x = 56 frames served as slow avi movies). The archive goes back to Nov 1st but increments daily. No explanation has been offered for the delayed upload on Dec 15th and first mention on "Follow Mosaic" on Dec 28th.

It's not clear if the Oct 4-31 floe motion is being held back or just delayed. The ice would have been in total chaos back then going by the chaos of the last two months in strengthened thickened ice, below. The minute-by-minute research grade terabyte dataset is not available which is appropriate.

The archive began duplicating the avi with identical and fully interchangeable m4v formatted videos on Dec 15th, reminiscent of the head-scratching duplication of 'mosaic_multisensor' with all-purple sea ice concentration overlays.

The file sizes are kept to a few MB using avi even though they are really just gif slide shows. ImageJ is very unusual in having an avi reader. This opens them as image stacks, with helpful options for grayscale and 180º rotation (to better align with S1AB and other 'greenland down' satellite imagery).

ImageJ is also very good at sharpening the periphery, reducing the overly bright returns from ice near the bow, changing palette, and concatenating bimonthly bites into a single image. Surprisingly converting the avi to forum-friendly mp4 at give as very helpful further reduction in file size.

The smaller gif at the bottom features the dramatic lead that opened a few km south of the Polarstern on 15 Dec 2019. Moderate benefit can come from contrast enhancement, sharpening and an indexed palette.

The bridge radar is confusing on first view, so set it on loop and (after download) click repeatedly on the double arrow to speed it up. The white scale bar is intrusive. Its central tip is the center of the fixed polar coordinate frame in which the bridge radar is stationary. It isn't clear if the bow-stern axis is also fixed nor if it points north-south. (The integrated navigation system records this information but it is not provided.)

The timestamp would be better with seconds and minutes rounded away, repositioned lower into vacant black space. The stern may wag about causing the view to shift when little is actually happening; the ship is also drifts and rotates quite a bit over the 60-day time frame of the video.

Overall, it is astonishing that scientists have been able to keep equipment deployed on the ice running at all. Actually, we have no idea how Leg 1 data collection went as little can be gleaned from short :) reports.

Expeditions like this were already being squeezed out of the picture by advanced calibrated satellites, massive buoy arrays and long range autonomous gliders. The ice seems too far gone for the floe platform concept to work.

Just because the ship will be drifting aimlessly until early January (when winds sweeping up from Siberia will finally send it Fram-ward) doesn't mean the ice will be quiescent. Worse, record lows have arrived with -34.7ºC recorded on 19-12-28 at 23:00 utc, making damaged equipment that much harder to repair.

And it seems that we are far short of the 8-10 extreme weather events expected in winter at the Polarstern's location (below or see #368). It's been quite stormy in the North Atlantic but so far extreme weather has not moved up past Svalbard to any extent.

Policy and solutions / Re: If not Capitalism... then What? And, How?
« on: December 29, 2019, 08:54:32 AM »
Matthew:13:12 KJV

"For whosoever hath, to him shall be given, and he shall have more abundance. But whosoever hath not, from him shall be taken away even that which he hath."

Brought to you by Supply Side Jesus: Rejoice !


Arctic sea ice / Re: The 2019/2020 freezing season
« on: December 20, 2019, 12:28:41 PM »
Thanks johnm33, I hadn't seen these before.
The  largest  component  of  the  tide  in  the  Arctic  Ocean  is  the  semidiurnal  M2 (period  12.42h).  Since  the  tide  producing force for this constituent in the Arctic Ocean is very  small,  the  origin  of  this  wave  is  an  incoming  tide  from  the  Atlantic  Ocean.  The  M2  tide  entering  the  Arctic  Ocean  between  Greenland  and  Scandinavia  is  divided  by  Spitsbergen into two branches. The main wave enters through the Greenland Sea and the secondary wave propagates around Scandinavia  towards  the  White  Sea.  The  latter      has  amplitude at Northern Norway of about 1m. In the White Sea at the entrance  it grows to  about 2-3m and in the shallow Mezen Bay the amplitude is greater than 4m.   The  M2 wave  in  the  main  basin    of  the  Arctic  Ocean  propagates  during  one  period,  counterclockwise  around  an  amphidromic point located off the Canadian Archipelago. The tidal  amplitude  is  zero  at  an  amphidromic  point,  and  it  increases    towards  the  shoreline.  While  traveling  in  the Arctic Ocean the M2 wave undergoes transformation. When it impinges  on  the  North  Siberian  Shelf  its  amplitude  diminishes  through  the  bottom  friction.  Along  the  North  Siberian  Shelf  the  amplitude  is  about  20-30cm  and  further  the amplitude decreases to 5-10cm at the Alaskan shore. The M2   tidal currents in the deep basin are quite small of the order of 2cm/s. The strong currents were observed along the coasts in the shallow water of the Barents Sea, especially over  Spitsbergenbanken  and    close  to  the  Bear  Island.  The  strongest  currents  often  up  to  2m/s  occur  at  the  entrance    to  the  White  Sea.  Along  the    North  Siberian  Shelf, 
especially  in  the  region  of  the  New  Siberian  Islands,  the  M2   tide  currents  are  often  of  the  order  of  50  cm/s.  The  variability of the tidal currents is much stronger compared to  the  tidal  levels,  because  currents  depend  on  the  local  conditions, e.g., the currents along Alaska Beaufort coast are  of  the  order  of  5-10cm/s,  but  in  the  narrow  entrances  to the coastal lagoons they  can be enhanced several times. Amplitudes of the second semidiurnal constituent S2 (period 12h)  are  much  smaller  but  the  general  picture  of  the  wave  propagating  counterclockwise  in  the  main  basin  is  very  similar to the M2 wave.

Arctic sea ice / Re: MOSAiC news
« on: December 19, 2019, 05:43:16 PM »
I was wondering why the MOSAIC podcast "Arctic Drift" is in German. Now i heard Markus Rex speaking English and i'm wondering no more.

Arctic sea ice / Re: What's new in the Arctic ?
« on: November 15, 2019, 12:16:57 AM »
Couldn't figure out where to put this so ...

Sea Ice Movements Trace Dynamics Transforming the New Arctic

Research led by the University of California, Riverside, is the first to use moderate resolution imaging spectroradiometer, or MODIS, satellite imagery to understand long-term ocean movements from sea ice dynamics. (... I think A-Team might beg to differ)

... "No one had bothered before to use MODIS because the satellite is sensitive to clouds and it's hard to identify ice," Martinez said. "Our algorithm automatically filters clouds and uses other image processing algorithms that give the velocity and trajectory of the ice floes."

"MODIS data is one of the longest records of earth ever compiled," said first author Rosalinda Lopez, a graduate student in Martinez's lab. "This means that we are able to expand our analysis to almost two decades to observe the variability of sea ice as dramatic changes transform the region."

R.Lopez-Acosta, Ice Floe Tracker: An algorithm to automatically retrieve Lagrangian trajectories via feature matching from moderate-resolution visual imagery, Remote Sensing of Environment (2019)


Satellite observations of sea ice along marginal ice zones suggest a strong coupling between sea ice transport and the underlying ocean turbulent eddy field. Moderate Resolution Imaging Spectroradiometer (MODIS) satellite imagery spanning over almost two decades of daily observations at a resolution of up to 250  m provides a good resource for deriving long-term ocean kinematics from sea ice dynamics.

In this paper, we present a newly developed automatic algorithm to retrieve dynamic measurements of sea ice from these images. We describe the methodology by presenting results acquired along the East Greenland Current (ECG) for 6.5  weeks in the spring of 2017. During this period, our ice floe tracker was used to identify and track ice floes with length scales ranging from 8 to 65  km. By effectively filtering atmospheric conditions from MODIS images, ice floes were tracked for up to ten consecutive days, and a total of 1061 trajectories were retrieved.

 A southward mean sea ice flow associated with the ECG was observed along with deviations in both direction and magnitude, suggesting the effect of an underlying turbulent eddy field. The absolute position and tracking errors associated with our method are 255  m and 0.65  cm/s, respectively, each derived from a comparison between manually and automatically identified ice floes. Going forward, our methodology will be employed to process longer time sequences to analyze nonlinear interactions between drifting ice floes and the upper ocean turbulent eddy field in the ECG as well as to investigate other prominent regions of the Arctic Ocean.

Arctic sea ice / Re: The 2019/2020 freezing season
« on: November 12, 2019, 10:48:00 PM »
The Chuckchi sea (and the Bering) can really start the next melt season with the record low volume (again). But it won't be a catastrophe because the CAB still have the pretty thick ice that will mostly survive the melt season.
This is wrong. The Chukchi and Bering are, IMO, directly tied to the freezing season in North America and its duration. If the Chukchi and Bering's volume remains at record lows through the freezing season and into the spring, there is a very good chance winter will not abate until May, or even June, across the most productive food-growing regions on the planet.

We already have a catastrophe unfolding after this year's late start and early finish. If 2020 repeats the same pattern (or worse) there will be major shocks to food prices beyond what is already likely in the pipeline due to this year's harvest.

If the CAB has ice when people start to starve, BOE will be trivial at that point. The impacts are already well underway due to certain regions becoming increasingly ice-free, and we may not even need an ice-free CAB to see catastrophe unfold in the form of spiraling food prices.

Permafrost / Re: Northern Hemisphere Winter 2019-2020 Snowcover / Misc Obs
« on: November 12, 2019, 10:37:35 AM »
  an early freeze would reduce snowfall in the vicinity by killing lake effect snow .. b.c.
It doesn't eliminate LES, strong winds move ice around and re-open the Lakes until at least Feb / Mar, and even with full 100% coverage this will still happen. It does cut down on LES.

But with the Chukchi now open in all of November and Bering the same for DJF, there is probably enough offset from up north for the difference to be less relevant than it would be otherwise (and this is the primary reason for the supremely FRIGID temps of late, as the +precip / +snowfall in areas that are close to desert is enough to drop their temps dramatically, which translates downwind). This is specifically in reference to the elevated "Triangle of Coldness" between the Northern Rockies, Hudson Bay, and the GL.

By springtime, as the ice begins to melt, I think the flux and extant ice are very much supportive of much more snowfall as a percent of overall precip when the lakes are covered (at least in their vicinity +/- a few hundred miles).

Arctic sea ice / Re: Arctic Ocean salinity, temperature and waves
« on: September 22, 2019, 11:53:23 PM »
if anyone has suggestions for a better calculated value to display, let me know please.
Very nice. As the data is quite old it may be more interesting to animate depthwise, rather than date. Perhaps a 10m average down to, say, 350m? If you are prepared to share code it would be most welcome on a dev thread.
This approach may also work well with the mosaic buoys.
L3 data time series would be handy for comparison with more recent data in similar locations though. Can you provide a link pls?
edit: I read the small print and see data goes up to 2019

Thanks, your suggestion turned out nice and I want to go deeper but ran out of time, so 0-350m it is for now. I'll post the R code over at the dev thread with some warning of amateur practices. Only for the data again, the others have different structures but next on the list.

Arctic sea ice / Re: Arctic Ocean salinity, temperature and waves
« on: September 20, 2019, 11:55:48 PM »
Great news :)
Reposting  whoi itp110 7m-50m from 2018, day264 to 2019, day120 (at location -134.8350  73.6623N) with location insert.

edit: corrected label and added part2
whoi itp110 7m-80m from 2019, day123-218
density green, temperature purple, salinity red
temp    -1.8 to 0.6C
salinity  27.5 to 31.2
density 1021.5 to 1025kg/m^3

The forum / Re: GIF size, your Internet, and what is usable?
« on: September 09, 2019, 11:19:44 AM »
Please, everyone doing GIFs:

In general, produce GIFs. They would work on any platform. If it's a big file (>2.5mb), canvas size should be >700 pixels so that it doesn't autoplay.

If there is no way around mp4 for you, consider uploading to Youtube and link it.

If you don't like Youtube for some reason, at least make it >700px big so they wouldn't autoplay and eat up data budget for users.

Thank you. :)

Pro-tip concerning screenshots. Even screenshots can be very big in file size. Upload them to EZgif, adjust canvas size to 700px, optimize it at 35 and then download as a GIF. You can easily make a 2.5mb file to be 150kb. Better for the forum server, the users and the CO2 consumption. Everyone is happy.  ;D

Arctic sea ice / Re: The 2019 melting season
« on: September 01, 2019, 08:23:54 AM »
August 27-31.


Additionally: August 1-31 (fast).

Arctic sea ice / Re: The 2019 melting season
« on: August 30, 2019, 10:47:39 PM »
The latest five day forecast looks like a disaster for the ice if we were still in the melting season... But this is my first crossover into the freezing season, so I have no idea what this mess will do to the ice. It sure looks bad!

I hope you Like it! It's Free! ;)

Arctic sea ice / Re: The 2019 melting season
« on: August 30, 2019, 12:29:27 AM »
Mercator 0m sea temperature with unihamburg amsr2-uhh overlay at 60% transparency. amsr2 0% concentration (open water, normally dark blue) has been set to fully transparent to show sst, mar21-aug28. (best viewed full screen, double click or right click) Note the amsr2 concentration wil be affected by the overlay and should only be seen as a guide.
Processed satellite data overlaid onto model data is somewhat questionable but the images dovetail pretty well at the ice edge. (model details here
I don't know if the jet from the Ob river to the LaptevCAB exists but it aligns with the bathymetry and the surface ice drift.
The west spitzbergen current has struggled more this year against fram export.
CAA/CAB crack will probably continue to be low concentration ice for a while even if the winds turn northerly.
Southern end of the Beaufort arm is likely to succumb to the warmer waters of the Amundsen Gulf.
Low concentration CAB areas - Who knows? Sterks mentioned something about particle size and fluids before leaving. 'It's sea ice Jim, but not as we know it' ;)

The forum / Re: Forum Decorum
« on: August 13, 2019, 11:03:06 AM »
My interpretation:
Sterks shouldn't have posted his personal fight with Neven here for all to see. I think that's disrespectful and unconsidering (We know Neven is in a difficult and stressful period because of family reasons).
Yes, Sterks had good contributions so that's too bad.
Warning: stay away from political discussions!  ;D ::)

I agree.

I don't touch any threads outside this one, the forum humour thread, and the Cryosphere sub-forum. From what I've seen of sterks & teapotty is their off-colour crud is quite similar. You know what? You shouldn't engage in such childish crap. Don't acknowledge it at all; simply report it & move along. They will be the one getting the boot, in time. That's the smart & more civil way to handle it. Don't let them drag you down to their level. Seems that's what happened here.

Personally, I post like my mom might be reading. Not like how I drive.  8)

The forum / Re: Forum Decorum
« on: August 12, 2019, 01:18:09 AM »
pot · kettle · black

I'd ban all kitchenware from the Cryosphere sub-forum, at this point. Or just scrap the forum entirely & stick to the blog only. Seems our primal instinct of throwing feces at each other from our respective branches is far from behind us yet. All we've done is name the behaviour [ego] & make excuses for it. So sad to see it propagating on such an objective/science-oriented board such as this.


Arctic sea ice / Re: The 2019 melting season
« on: August 10, 2019, 04:12:56 PM »
July 13 - Aug 9 (4 weeks)

This animation is a 5-day minimum, not median.

Using the minimum introduces some artifacts. Areas of low concentration ice that are moving will leave a 5-day memory on every pixel they cross; for example, areas of part water and part moving ice, such as the Beaufort edges or ESS, will look like they have more open water than they really do. Similarly, if there are low concentration cloud artifacts, they will also be preserved for 5 days. Also, if new ice were forming, it would likewise not show up for 5 days; but no new ice is forming yet.

However, in my experience, the vast majority of artifacts in these maps are high concentration cloud artifacts, and using the minimum does well at removing most of those. If you follow the evolution of the ice edge this seems to do a good job and maybe hints at what might be coming, such as a continued edge retreat in the Beaufort (minus advection) and NW of the Laptev bite.

Maybe think of this map as something like a worst-case scenario. Use the originals (on the right) as a guide to aid interpretation.

Large file - click.

Arctic sea ice / Re: The 2019 melting season
« on: August 08, 2019, 10:16:22 PM »
'cold air has been flowing persistently to northern Finland from the Arctic ocean'
and doing its best to take the ice with it. Not that it gets far into atlantic waters.

Today looking at mercator 0m sea temperature with unihamburg amsr2-uhh overlay at 60% transparency this time to allow some of the mercator model's higher coastal SST's beneath the ice to show through. I didn't notice that before doing this overlay. That would explain the rapid melt of ESS/Laptev fast ice. amsr2 0% concentration (open water) has been set to fully transparent, jun1-aug7.
Attention is unsurprisingly mostly on the Chukchi/Beaufort and Laptev at the moment but note also the heat building up to the east of the Fram Strait.
The CAB beginning to resemble a ripe stilton

Arctic sea ice / Re: The 2019 melting season
« on: August 07, 2019, 10:21:13 PM »
Looking at the Parry channel there would seem to be a connection between ice break up over the shallowest part, south of Resolute, and ice break up at the mouth of the Mclure Strait. That probably doesn't surprise anyone, but it also looks like, this year, there may be a connection to sudden melt over beaufort deep water west of Mclure Strait. One possible reason is that a larger volume of water has been drawn into the Mclure Strait, causing upwelling close to the shelf further west. Or it could just be coincidence.
whoi itp103 passed by the Mclure Strait recently and the microcats detected a significant temperature spike, but no increase in salinity, perhaps due to meltwater from above.
itp103 location on day560    -129.8953  76.6136, west of Mclure Strait

gmrt bathymetry with unihamburg amsr2-uhh overlay at 75% transparent. Open water, normally dark blue, set to fully transparent, parry channel area, jul1-aug6.
gmrt bathy for reference
whoi itp103 microcats, mounted at 6m and 7m depth
whoi itp103 drift track

edit: unfortunately no scale with my favourite bathymetry map but point and click depths are available at their veiwer here  blue is deep, beige/grey is shallow. Heavy contrast here to bring out the contours.

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

Arctic sea ice / Re: The 2019 melting season
« on: July 27, 2019, 03:10:39 PM »
Bearing in mind some of the comments on the ice thickness products upthread, here is ascat overlayed with unihamburg amsr2-uhh at 55% transparency. To allow the ascat features to show through, amsr2 100% concentration ice, normally white, has also been set to fully transparent.
Although weather/other interference obscure many ascat features recently, I think the animation still gives a rough guide to the position of the older and possibly still thicker/more resilient ice that remains.
ffmpeg -crf 27 switch to reduce file size. Where ascat data is missing or poor quality the nearest days have been duplicated, causing some stutter

Arctic background / Re: Arctic Maps
« on: July 22, 2019, 09:07:57 PM »
Thanks again everyone.
johnm33, I occasionally get incomplete contours, so I suppose I will try again, although if I zoom in that far it will be tricky to patch all the images together.
mitch, I've seen the letter sized map, I was hoping for something larger. Though it is pretty good when zoomed using acrobat. I'll try patching that together too.

I tried heavy contrast on the previous compilation and surprise, the contours are there. They are nearly all the same colour though. Here is the heavy contrast version, which satisfies me for now.

Arctic sea ice / Re: The 2019 melting season
« on: July 22, 2019, 01:19:53 PM »
Perhaps more of a worry is that the low concentration area is at the tip of the atlantic current, here shown using mercator salinity at 34m. Note also the lower concentration area above the current further west.
edit: forgot scale

Arctic sea ice / Re: The 2019 melting season
« on: July 20, 2019, 07:58:48 PM »
After testing yesterday here is large version of unihamburg amsr2-uhh, jun1-jul19.
mercator(model) SST inset, also jun1-jul19.
Best viewed full screen.   edit:click on the square arrows icon bottom right.thanks Niall

Arctic sea ice / Re: Arctic Ocean salinity, temperature and waves
« on: July 06, 2019, 05:42:58 PM »
mercator(model) 0m salinity with uni-hamburg amsr2-uhh overlaid at 40%. Open water(blue) set to transparent. mar21-jul4.
glitch at the end is due to 4 mercator forecast days instead of analysis, will fix that for next time

Policy and solutions / Re: Space colonization
« on: July 05, 2019, 10:28:09 PM »
After carefully studying the documentary "Earth Girls are Easy" I'ved determined that the scientific breakthrough that will most benefit mankind is the ability to shrink humans.

Once properly sized the problems of sending brave, but tiny humans to Mars colonies shrinks to a manageable size.

Envision a colony capable of housing a million souls that weighs but a few kilograms and fits easily in a size 9 shoebox!

We could start by simply cross breeding Pygmy tribes with members of the Little People of America organization - but this is too slow a process, wouldn't result in the needed size reduction and might retain undesirable traits such as the squeaky voices so prominently featured in films such as the original version of the Wizard of Oz.

CRISPER technology is where we should be looking.

Once we've reduced humans to the size of small kittens we may find that we've genetically engineered our way out of the food, water and housing crises that we're soon to face.

McMansions with 10 square feet of living space will require little heating or cooling. Electric trains and EVs will run off a few "C" cell batteries, and a thin goat could provide sustenance for hundreds.
Christ's feeding the masses a few loafs and fishes will seem wasteful.

Robots will take over all the jobs requiring strength. Our sciences will continue to develop better and smaller micro-technology and micro men. Our problems will shrink away until we will no longer dream of leaving our so recently relatively enlarged home planet.

Are we men, or are we mice. Squeak up boys.

The 2019 sea ice area and extent data thread would be a whole lot better if the meaningless chatter was here instead of there.

Arctic sea ice / Re: The 2019 melting season
« on: June 15, 2019, 12:49:33 AM »
unihamburg amsr2uhh overlaid onto ascat with 100% ice (normally white) set to transparent. The amsr2 overlay is 70% transparent to allow other features of ascat to show through, notably greenland. It also helps to make the 'weather' over open water less distracting.
Similar to last year the wash of warm weather has revealed fractures in the older ice that were not visible previously.
thanks to A-Team for helpful hints, some of which need further work,2558.msg205561.html#msg205561

Greenland and Arctic Circle / Re: The Nares Strait thread
« on: June 02, 2019, 06:42:16 PM »
This rather big floe that just entered the Nares Strait has melt ponds.

(GIF requires a click to play)

Arctic sea ice / Re: What's new in the Arctic ?
« on: May 31, 2019, 12:33:55 AM »
I made a quick and lightweight sea ice comparison page for the entire NSIDC data set. At the moment it's just for the 1st of the month, but soon I add the 15th of the month as well.

Arctic sea ice / Re: Arctic Ocean salinity, temperature and waves
« on: May 26, 2019, 12:26:28 AM »
for reference, a rough overlay of global hycom cice ice thickness (GLBb 0.08-93.0) over ascat at 42% transparency.

Greenland and Arctic Circle / Re: The 'Very Big Chunk' poll
« on: May 11, 2019, 08:00:17 PM »
This method does appear to show tidal movement.

Yupp, see GIF. Click it!
Funny how the wave coming from the south (or something) is causing gyres in the strait right now. Have never seen it that pronounced.

By the way, does this rule out 'not!' or does it have to stay put for 24hrs ?

Has to stay put for at least 24h. Otherwise, it's 1-3 Days.

Arctic sea ice / Re: The 2019 melting season
« on: April 27, 2019, 07:47:45 AM »
00z Good-for-sh*t has 576DM ridging over Beaufort @ hr 120 :o

Thanks for your updates on this Bbr. One question though. Could you provide a little more commentary in plain language, so non-meteorologist can understand you too?

Arctic sea ice / Re: The Rammb Slider Thread
« on: April 19, 2019, 10:54:58 PM »
Looking for something about Amundsen Gulf tides found this journal from 1986.

International Hydrographie  Review,  Monaco,  LXIII (2),  July  1986CANADIAN  ARCTIC  TIDE  MEASUREMENTTECHNIQUES  AND  RESULTSby  B.J.  TAIT,  S.T.  GRANT,  D.  St.-JACQUES  and  F.  STEPHENSON (*)

The  tide  in  the  southern  Beaufort  Sea  and  in  Amundsen  Gulf  propagates counterclockwise  about  an  amphidromic  point  situated near the  southwest  corner of  Banks  I.  It  propagates  quickly  along  the  coast  from  Alaska  to  a  point approximately midway along the Tuktoyaktuk Peninsula where it slows significantly,  reaching  Sachs  Harbour (site  4,  Figure  2)  on  Banks  I. about  six  hours  later.  In Amundsen  Gulf the  tide  travels  east  into  Dolphin  and  Union  Strait  and  Prince Albert  Sound  and  northwest  into  Prince  of Wales  Strait.The  tidal  propagation  patterns  in  the  waterways  between  the  eastern  end  of Amundsen Gulf and the southern end of M’Clintock Channel are complex and not yet  well  defined.  Further field  surveys  are  planned  for these  areas.

First image is fig2 from the journal.
Original rammb animation 35MB (80 frames) when cropped was 5MB and very small. Enlarged 2x took it to 18MB. Converting to mp4 gets 384kB. (click to play)
ffmpeg -i rb2.gif -pix_fmt yuv420p -vf "scale=trunc(iw/2)*2:trunc(ih/2)*2" rb2.mp4
Worldview terra modis apr18 (or nearest) 2010-2019posted on melting season (deleted here to help save the planet)

For me it's the anecdotal stories. I think I am probably one of the least ( formally )educated people on this forum but I have, like any other human, stories to tell. Watching as the ocean has changed over my lifetime as a commercial diver and fisherman gives me an opportunity to tell a unique story. I have watched as the abalone resources have , for the most part , collapsed. The starfish and the sea urchins also succumbing to disease brought on by the stress of increased ocean heat. My own guilt in knowing that the fuel I have used to pursue a fishing career has contributed to the death and mayhem now all around me.
 My transition to farming also comes with stories of decline. The 108 F heatwave that last year killed all the fledgling swallows in their nests and this years abandoned nesting  colony that had returned every one of the last twenty years till now. The disappearance of the Phoebes that also shared my farm with me for twenty years, the noticeable declines in insects. The loss of so many pines and oaks during our eight year drought. 
 The struggles against what appear to be irreversible changes. Tragic losses and what passes for my feeble attempts to forestall future horrors yet unseen. My stories, our stories , and the emotional context that might inspire others  to look a little deeper , fight a little harder,  and on occasion shed tears over our shared losses.   

The rest / Re: How Educated are we as a Forum
« on: April 04, 2019, 10:50:47 PM »
uni drop out

Arctic sea ice / Re: Are 3 dimensions better than 2?
« on: April 04, 2019, 10:06:37 PM »
Weather is unaffected by ice thickness also.  The entire evapotranspiration process is cutoff, when the water is covered by ice. 

Given the topic at hand, the differences between open water and an ice-covered surface is significantly greater than the difference in ice thickness.

GAC2012, in case one has forgotten, puts a great lie to those statements. The GAC ran onto ice, which if thick and solid would have died out quickly as the temp differential between the outer edge and core would have become the same as both would have been using the same air. What happened in 2012, the ice was thin or if thick very broken, which when the storm first hit dispersed the ice giving access to open water. End result was the temp differential remained high enough the the storm continued doing damage for a very long time. Volume and density do matter very much.
Another factor is waves. Waves hitting a wall of dense thick ice lose all their energy very fast. In 2007, scientists witnessed many times where waves were entering ice fields 100's of miles from the edge and destroying ice over 10 meters thick because the ice was really nothing more then slush. Again volume and density matter.
The last few years we have not seen a GAC nor the kind of wave action that destroys fragile ice and therefore extent has been a very important factor as  far as the shape of ice appears to be in, but if we get another storm like in 2012 or wave action like in 2007, and I feel that we would witness very large fast decline in the ice, because the volume and density of the ice that is around is very very fragile.
BTW I have not voted because it all depends on the weather. Some conditions the 2D metric is far better, but in others the 3D is far better. If we ever can get to the point of getting reliable density measurements, that would be even better.

The rest / Re: The Empire vs Venezuela - News and History
« on: April 04, 2019, 12:13:13 PM »
Lurk's post of Eva Bartlett's piece above literally says : "I don't see a 'crisis' in Caracas".

Yes, and a certain David Viner once said that kids in the UK would never see snow again. He represents all scientists, and hence AGW is a hoax.

You go dig for one quote by one person, and then you smear a whole group. You engage in the same tactics as climate risk deniers.

And even then, she says 'Caracas', which isn't all of 'Venezuela'.

Name one with more than 1 million percent inflation.
Or name one that is selling the gold from their central bank.

And name one who got there because of US foreign policy.

No two countries are the same. I can name you one with more than 1 million dead people because of US foreign policy. I can name you another one that is completely devastated because of US meddling. And I'm sure that in the past there have been other countries in the past with more than 1 million percent of inflation, selling its gold, more or less enhanced by illegal sanctions.

The point is: The media doesn't make a fuss about those other countries, except when it's about regime change that serves US corporate interests. And you only care when the media tells you to.

If he got Venezuela wrong, why is Bernie your top pick for president of the US, Neven ?
Wouldn't Tulsi Gabbard be a better choice for you ?

Bernie doesn't get Venezuela wrong (stop twisting words like a climate risk denier), he frames it the wrong way, playing into the hands of those who are trying to establish a narrative that manufactures consent, so they can go make money off of other people's misery. Bernie needs to frame it in a different way, by emphasizing that Trump/Pompeo/Bolton/Abrams/Rob Dekker need to stop meddling, that the illegal US sanctions need to be lifted asap, and that only then is there a need for open and fair elections (they aren't fair because of the sanctions) and a way forward where the US and Venezuela work together to decrease Venezuela's dependency on AGW-inducing oil.

What happened to 'resist Trump at every turn'? First you help him with Russiagate, now you help him with his corporate warmongering, so the neoliberal stooges can pump oil more efficiently and put the profits in their own pockets (hence no better than the corrupt system now in place). You're no better than a Putin puppet, Rob.

No, actually, you are better.

Arctic sea ice / Re: The 2019 melting season
« on: April 01, 2019, 11:42:17 AM »
The Atlantification/Pacification of the basin is a growing thing not a seasonal intrusion. Once the Halocline is either flooded over or mixed out it'll take a nice age to rebuild the depth we had as recently as the noughties?

The loss of that layer allows a very different ocean , and processes ,to evolve in line with all the other Oceans of the World.

My concern is , like so much else in nature, it is not a straight line graph of change but one with very rapid periods of alteration?

Consequences / Re: The Holocene Extinction
« on: December 21, 2018, 07:54:08 PM »
SH, I find different agricultural emissions numbers ranging from 9% to 17% for the US. I think we are energy hogs with agriculture contributing less here than other parts of the world only because we fly, and drive and live in big houses with big appliances .
 From the EPA ,agriculture contributes 9% with cattle contributing one third of the total . Even if total agriculture is more like 20% I would think the one third from cattle is probably a fair assessment . I keep saying I agree that reducing meat consumption is a good idea but it is far from enough.
 I have sincere doubts about livestock utilizing 93% of arable land however. Maybe part of the discrepancy of emission figures has to do with assigning an emissions number for the farming emissions from livestock feed production.
 My biggest disagreement is with your premise that meat is low hanging fruit.  No hamburgers, no milkshakes, and abject poverty for vast swaths of middle America.  I think food prices would be a potential disincentive that far exceeds volunteerism . Subsidies cause distortions in food choices and they are intended to do so. Keeping the public fat and happy may be a contributing factor. Again I am proposing a radical shift and telling farmers they need to forego 20 billion in subsidies is radical. Keeping those middle American republican votes requires the subsidies to be maintained and Trump threw an additional 5 billion to farmers yesterday to compensate for his trade war damage. At the same time he is shutting down the government to get a similar 5 billion dollar wall number. So democrats are willing to cooperate on ag subsidies ,not on a wall.
 None of this addresses the damage that subsidized commodity dumping has on artisanal farmers in the third world . Like I said earlier it sucks for vegetable operators also.
Dump the fuel and energy subsidies
Dump the agriculture subsidies
Wait for the chaos that follows to crash the GDP and resulting in meaningful reductions in emissions.

Yes I realize the fact that I can feed myself probably affects my suggestions but more people need to take up the challenge of feeding themselves. That to me is the real low hanging fruit but it is probably necessary to load the scales in people's decision matrix. Pain and hunger are big motivators..

The rest / Re: The Media: Examples of Good AND Bad Journalism
« on: December 15, 2018, 03:18:09 AM »
The Psychology of Gaslighting

Ask me to explain the details in the molecular physics and mathematics behind the actions of GHGs and I will be at a loss. On the other hand I think I was blessed to have some good teachers about human behavior and psychology. With many opportunities to practice and observe some of the things I was shown at work and in social settings among groups of all kinds of different people. I have also seen those very same things I had learned being played out in the media and especially politics where life can become very stressful indeed.

When people feel under pressure, are being criticized or are stressed there are 4 default communication modes that are typically adopted unconsciously. The most common one is to become a Placater, to be submissive. We all learn this mode from the moment we are born from our parents, our families and in kindergarten especially. The template is laid down in our neural pathways.

The next most common response mode is to become a Blamer back. This has been called by some the Blamer Blamer mode. The best form of defense is to attack. Behind school yard bullying and peer-pressure is this Blamer communication mode. Why? It tends to work a treat. Especially if one can do it successfully without any guilt and with self-righteous indignation. It too becomes a template laid down in an individuals neural pathways when a child or a teen.

Understanding how this can operate on a personal level helps by also understanding that typically when someone is pointing the finger against another for some poor behaviour or harm that has been (perceived) to be done, then 3 others fingers are pointing back upon themselves. Try it - point to the wall and see what your three little fingers are doing. It's a physical representation of a psychological truism. This is what the DNC and the Hillary Clinton Campaign have essentially been doing since 2016.

Part of my observations have involved seeing how individual people function within Institutional settings eg when in schools, colleges, Government departments, businesses, corporations, political movements, bikie groups, religions and churches. While they can adjust the personal behaviours to fit the framework in which they are operating once there is excessive stress involved they all tend to default back to their individual modes of communication.

An Institution that is being criticized, outed or is under attack therefore mimics as a whole entity similarly to what the people inside are feeling like and how they are reacting when stressed.

The analogy is to imagine an unfaithful husband. The wife gets a 6th sense something is not quite right. She tries to ignore the changes she has noticed but eventually, upset, stressed, she confronts her husband with her unproven evidence free suspicions. Knowing she is right and therefore immediately triggered by the stress of being found out the husband switches immediately to Blamer Blamer mode - "How dare you accuse ME of such a thing!" - "I have had all this extra work to do, I am doing my best, but it's YOU who hasn't been paying me enough attention or supporting me through it." And they're off.

People can only defend themselves based on what they already know. They cannot be instinctively creative when under stress. Unfaithful husbands know what they have been doing and how they have tried to avoid being exposed. Knowing that, they will automatically begin to recall examples in their wife's own behaviour that 'mimics', looks very similar to, the things he has done himself.

In blamer blamer mode the husband can turn the tables and lay out all these examples of how 'suspicious' some of the wife's own 'changes' and odd behaviour have been lately. She knows she has not been unfaithful, and so what she is presented with is a very powerful case of Plausible Deniability on the part of the husband. Gosh, maybe she was just being paranoid and reading too much into it, she thinks.

The key point here to remember is that the guilty party knows exactly how things work when one is covering up secrets, nefarious, underhanded or unethical behavior.  Even more than this, this is precisely how they generally think. It's their basic Psychology iow.

However usually, the wife will immediately switch to the Placater mode because she feels guilty - she can see well yes, what he says could be true too. Maybe 5 years later she finally come across the hard evidence she was right all along.

All Institutions are made up of people. As such whole Institutions operate in a very similar way. They too point fingers. But all of them find 'placating' an impossibility. Their default position when under stress is always to defend, to attack, to blame the accusers as much as possible. You've seen this happening all your life - from both sides of the fence. Maybe you never thought about it at a human personal level before or ever imagined some core default human communication mode being in play by an Institution.

How do you think the Catholic Church and the thousands of other Institutions who have avoided their complicity and cover-ups of child abuse for so long?  Every Institution operates in the same ways. It's in their 'nature' do be like that. Because they have all been 'created' by human beings to a particular standard design for centuries.

So knowing all this and being able to see it play out in the real world up close and at distance one can get a really good hint about what may be going behind the scenes even with a total lack of hard evidence. But when people are unable to even become suspicious about anothers behaviour they have little to no chance of ever thinking about what kind of evidence might even exist or where to go find it.

Placaters simply accept what someone tells them at face value. They do not wish to be seen as accusatory or radical or argumentative. Silence works to decrease one's stress levels and help them turn away from things they do not wish to even contemplate could be true.

So if you really want to gain some insights into the possibility of the guilt or innocence of the DNC and the Clinton Campaign then I suggest the following. To understand what they know, and to understand how they think about things in general, and what their ethical standards may be, go read their Court submission for their Lawsuit against Wikileaks and the Trump campaign. It's an 'open book'.

You see, I posit that it's more likely than not that the DNC et al know exactly what it is like to be thinking about and doing those things they are blaming the others for. They also know how to go about it in practice. They are speaking about things they already intimately know about from their direct first hand experience.   :o

It has been said 'the eyes are a window into the soul.' I say people's words (and the words of Institutions) are a window into their mind and how it thinks.

Arctic sea ice / Re: The 2018/2019 freezing season
« on: October 25, 2018, 08:22:18 PM »
It looks like, on the surface, there is a strong freshwater flow from the kara sea (from the River Ob?) that flows into the Laptev, probably causingenabling the arc of flash freezing.
The mercator model is starting to look quite accurate (despite the scales)

Arctic sea ice / Re: The 2018 melting season
« on: August 24, 2018, 11:55:33 AM »
The forecast is for higher waves next week.

Looking for reasons for the Lincoln Sea melt, here is mercator 34m salinity, jun2017-aug2018, every 8th day and a bathymetry map

Arctic sea ice / Re: The 2018 melting season
« on: July 31, 2018, 05:56:39 AM »
Adding today's false colour ice concentration map from U. Bremen, now 7 consecutive daily maps spanning 6 days and ending at 2018-07-30.

Click to animate...

Arctic sea ice / Re: The 2018 melting season
« on: July 27, 2018, 06:07:34 PM »
I am as surprised as everyone else by the quick deterioration of the ice. ...
We've had hints.  Thinking back to the refreeze, the regions now disintegrating were late to freeze, and suffered heavily from persistent imports of heat through the Bering.  This was reflected in some of the thickness maps, but others consistently reported that the ice was probably a meter or more thicker than it actually was.

Roll forward to today.  Speaking in approximations, in recent years (2015 to present) volume at peak is running around 21,000 KM3 at max.  If you take the most recent maximum extent - about 14,000,000 KM2, we end up with an average ice thickness of about 1.5 meters.

Looking earlier - here I'm thinking of the old regime - 1980-89, the extent isn't particularly greater - only about 16,000,000 KM2, but typical average volume is much higher - on the order of 31,000 KM3, which gives us at that time a typical average thickness of around 1.93 - call it almost 2 meters.

The difference between the two - 50 centimeters - is very key, because the drop in thickness and volume means that we've passed a key threshold:  the typical energy taken up during the melt season in the Arctic is almost enough to melt out all volume.  The number here, approximating from Jim Pettit's graphs examining typical volume lost during the melt season, divided by max area works out to be about 1.3 meters of melt.

Obviously that melt isn't distributed evenly, nor is ice thickness.  However, it does mean that regions which do not pass that 1.3 meter thickness during the refreeze are now at serious risk.  It will take extraordinarily favorable conditions for ice retention to prevent an *average* melt from melting out the areas where this is true.

I think that's what we are seeing here, and elsewhere, such as the interior of the CAB where we've been having surprising losses in area.  Interstitial ice formed in leads during the season which did not have time to thicken sufficiently past that 1.3 meter threshold is disappearing.

We are definitely in a new regime.

Arctic sea ice / Re: The 2018 melting season
« on: June 26, 2018, 07:50:36 PM »
In the melt season, yes it's useless for measuring thickness.

What it is sensitive to then is "wetness of the surface and occurence of melt ponds":

I stand corrected. I figured it was useless because the changes are all over the place when I look at animations. But maybe there's a way to compare to previous years, after all.

My very amateur weather eye sees that the weather forecasting models look quite consistent for the next week, with high pressure currently over the Laptev sea weakening but ridging toward a building high on the Beaufort/CAA side, which stays stationary at about 1025mb into the weekend. Meanwhile low pressure spins near Franz Josef Land, although the models differ a little on how deep the low gets, ECMWF a bit weaker and GFS a bit stronger. Seems like good melting weather for parts of the ice that haven't seen much direct sun yet, continued strong sun in along the eastern Siberian side, and also consistent winds blowing ice toward the Atlantic.

Excellent summary. I'm curious to see how extent and area will respond, given the recent spectacular stall. If it takes too long, I agree with Friv that this melting season won't be making top 5.

I think there is far too .much obsession going on with meltponds and surface wetness. For various reasons there is big increase in salinity from the surface to the bottom of the ice now. Try floating some ice on some salt water and melting the top with a hair dryer. It will quickly refreeze on the surface. BECAUSE of the energy absorbed by the bottom melting. The Arctic is bottom melting faster than ever before. And wave action, porosity, small fragment size, no deep keeled ice to maintain a freshwater lid are all contributions.

Consequences / Re: Decline in insect populations
« on: June 18, 2018, 10:06:03 PM »
As a farmer, when I first read the article on insect decline last fall, it rocked me to the core. Scared me even more than the scariest climate change scenarios. It also rang true. We work to attract beneficial insects and it seems to get harder each year even as we have more host plants. We are, like most organic farms, surrounded by conventional farms. We farm apples and the standard budget for apple orchards, prepared by the very good ag program at the university nearby, calls for 14 rounds of spray each year. 10 of those are insecticide or fungicide. We're organic but even we have to deal with the coddling moths, which lay eggs that hatch into worms in apples. We use a virus that only kills the coddling moth but even that I ask myself - how am I contributing to this terrible problem? Achieving a balance where birds and predatory insects eat enough of the moths to have the worms stay at an acceptable level is kind of a fantasy. In our world there is no acceptable level of worms in apples. We sell mostly direct so there is a little forgiveness but if we were bigger and shipped apple there would be none.

We're a big berry growing area and those ship internationally. A certain fruit fly has become a problem here and there is zero tolerance for them. What does this mean? Blueberries, especially late season ones, are often insecticide sprayed every three days. I know conventional growers that won't eat their own berries because of the level of poisons on them.

I've no doubt that agriculture is largely responsible for insect decline. That said, consumers play a significant role here too. If you expect perfect produce know that the environmental cost of that is huge. I've had people tell me they won't buy organic produce because only chemically treated produce can leave them assured they won't encounter a bug. I doubt that much of the public would say they prefer chemicals to insects if you asked them. That said, almost all of them will chose the most perfect apple in the bin.

The rest / Re: 'Deep State' Fact or Fiction
« on: May 26, 2018, 11:02:59 PM »

Nice topic

From my experience of having spent a career deep in the bowls of the military/intelligence machine I would state with total conviction that a 'Deep State' does exist.

But not as some imagine it.  For instance this from your first post..

"In the United States the term "deep state" is used within political science to describe influential decision-making bodies believed to be within government who are relatively permanent and whose policies and long-term plans are unaffected by changing administrations.

..absolutely does NOT exist.  This is conspiracy crazy stuff from spy books and movies.

But if you take this quote.

The term "deep state" was defined in 2014 by Mike Lofgren, a former Republican U.S. congressional aide, as "a hybrid association of elements of government and parts of top-level finance and industry that is effectively able to govern the United States without reference to the consent of the governed as expressed through the formal political process."

I would say that pretty much hits the nail on the head.  With the addition of those of very substantial old money wealth also having significant influence.  But this term far predates Lofgren and 2014 as I used to use it and hear it in conversations at work back in the 1980's. It has been rattling around for ever.

The Deep State is not an secret organization sending little missives down to the President and Congress telling them what to do.  It does not work that way.  What it does is basically provide the strategy and direction of the country.  It works to maintain the Empire and grow it when possible, it sets the ideological parameters which govern the political parties, it chose the neo-liberal economic structure which the D's and R's adhere too, it chose globalization at the expense of the workers, and so on ad infinitum.

You can see the workings of the Deep State in its reaction to the reforms and govt structure put in place by FDR.  It lost control then and spent decades working its way back into full control.  Ideologies were reworked, goals towards deregulation set in place, resetting the tax structure to strongly favor the wealthy, using various forms of propaganda to steer the voters emotions towards voting against their own interests, maintaining a permanent state of war, taking over the free press so that we have corporate control over almost all media, deepening the surveillance state whenever possible, and so on.

You select your ideological precepts, find political scientists and economists to provide a paper basis for your goals, push candidates who will attempt to implement your desires via new laws or by revoking old ones, work hard to undercut the political power of your opponents, work to cripple the public school systems, create armies of lobbyists and thousands of 'think tanks' to push your agendas, stuff the courts with pliable judges (corporations are people for instance), and so on.  All stuff we have witnessed over the last 40 years. 

The US is a democratic country in name only.  Voters have virtually zero actual influence on policy, the voting of our officials, and, of course, we don't actually vote for the top 2 positions even though we pretend to.  Our directions are set by the 1%, the captains of industry, the leaders of the MIIC - the Deep State.

This is not to say that there is complete consensus among them.  There is always strife between humans and different ideas and power structures.  But there emerges, if not a full consensus, at least enough of one to enable movement in a general direction to take place.  Change comes slowly in such a system as the need for new approaches are identified and adaptations made.  Thus we have destroyed most of what enabled the working class and middle class to have decent lives over the last 40 years - and the mainstream D's and all the R's worked hard to make this happen as their masters wished them to do.

Pages: [1] 2 3