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Messages - Tor Bejnar

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1
my take is that it then took three years for sufficient seawater ingress to float the basal ice in the first trough and have that break through the overburden of glacial discharge.
The glacier is too thick to float and both GPR & seismic indicate it's solid ice until water-permeated glacial till at the bottom. The meltwater is fresh and it's being dumped into the fjord continuously. Can you find a scientific publication where the authors argue that the saltwater gets to penetrate upstream?

2
Policy and solutions / Re: Extinction Rebellion
« on: April 19, 2019, 05:05:35 AM »
Yours truely demanding the Nelson Council in New Zealand declare a climate emergency. See short video at link below.

https://www.facebook.com/josegcano.111/videos/271302860415158/




If not now, when?
If not me, who?

3
Arctic sea ice / Re: The 2019 melting season
« on: April 17, 2019, 05:59:39 PM »
There has been a major shift in the atmospheric circulation pattern around the Arctic. The ridging which persisted over Alaska in February and March has ended while a strong ridge has set up over Scandinavia. This has allowed for an apparent recovery on the Alaskan side of the Arctic, although the reformed ice is very thin and won't last long. The heat on the Atlantic side won't show large effects on metrics because it is going over thick ice that was piled up at the exit to the Fram strait.

One not so good thing for sea ice about this atmospheric circulation pattern is that the coldest anomaly is focused on Baffin bay with strong north winds down the bay. This will enhance the circulation of warm salty water into the bay along the coast of Greenland and the flow of icy fresh water out of the bay into the Labrador sea. This will favor continued overturning in the Labrador sea and the release of oceanic heat to atmosphere over the far north Atlantic and subpolar seas.

4
Antarctica / Re: PIG has calved
« on: April 17, 2019, 11:47:44 AM »

In my opinion the SW crack (the low left one in Sentinel, the right one in Wipneus' post) has grown, widened and lengthened since then.

PS. these Sentinel Images are from identical orbital positions.


Mostly yes. Here is an animation of a month of Sentinel 1 A/B images showing changes in the other crack as well, less pronounced perhaps.

As a result from the 10m/pix resolution, you must click the image for the better view.

5
No there are not. It's simplistic to suggest it is. To do so dumbs down the "debate/discussions/arguments/alternatives" into a false non-existent dichotomy.

Really? Well when Obama's speech writers ripped 3 paragraphs of my words from Climate Progress (the old site) and presented it in a slightly different way, then was given as a speech by Obama, I beg to differ.  It was exactly in this vein.

Granted I was defending Obama; which is a pretty big thing because I really don't like his politics.  So it is no surprise that it was picked up.

I've been reading, discussing and contributing on climate change for nearly 2.5 decades now.  Sadly I'm just a slow learner...

So please excuse me for ignoring all the rest of what you say based on the premise above.

6
Arctic sea ice / Re: The 2019 melting season
« on: April 09, 2019, 01:42:52 PM »
This looks very broken up, more than usual?
The north greenland fractures are similar to previous years but the lincoln sea makes it look worse this year. Thick ice build up on the north coast happened in 2016 but I think that was helped by more MYI from CAA. This year not so much MYI and more compaction from northern drift perhaps.
I only went back 2010-2019, worldview terra modis, north greenland, apr8 or nearest clear day.
https://go.nasa.gov/2UNrux8

7
Arctic sea ice / Re: 2019 sea ice area and extent data
« on: April 09, 2019, 07:41:13 AM »

It looks as if the line will continue downward in at least as steep an incline as the rest of the years which will make 2019 the record lowest extent!
...
I'm starting to take near term human extinction forecasts more seriously!

You'll come to see that the Arctic is out there to fool you. Noone in my experience can forecast, not even a single year but the next month either.

As for extinction, I don't believe in that. Humanity is quite versatile.

Generally true, but as a permaculture practitioner, and generally my entire life, I've a good sense of patterns. While the scientists still minimize or claim no relation between ENSO and ASI, I believe there is fairly significant one. Ergo, I was able to predict new lows, near new lows in ASI in the 2016-18 time frame due to the EN beginning in 2015.

Since then, I have seen some research showing warm air and moisture from the Pacific affects the ASI - which is exactly what my hypothesis was: EN's lead to a loading of heat into the Arctic, and it can take time, so within two years of an EN (no correlation with LN), there are typically new lows or near new lows.

We all know there were tons of daily (monthy?) records for extent, area over the last couple of years, particularly in the non-peak months, which I think we all assume has some effect on what I refer to as pre-conditioning.

From RealClimate, Aug, 2015:

Quote
Here is what I found going all the way back to the beginning of ASIE decline @ 1953-ish.

EN ’51 – ’54 = inception of ASI Extent decline.
EN ’57 – ’59 = Near New Low/New Low
EN ’65 – ’66 = Near New Low/New Low
EN ’68 – ’70 = New Low
EN ’72 – ’73 = possible correlation, some delay
EN ’76 – ’78 = New Low
EN ’79 – ’80 = New Low
EN ’82 – ’83 = New Low
EN ’86 – ’88 = New Low (’89,’90)
EN ’94 – ’95 = New Low
EN ’97 – ’98 = Drop from Previous (?)
EN ’04 – ’05 = Near New Low/New Low
EN ’04 – ’05/’06 – ’07 = New Low
EN ’09 – ’10 = New Low (’10, ’12)
EN ’15 – ’16 = New Low ’16,’17?...

...the hypothesis is more a 1 to 2 year lag, not only one. Looking at only one year wouldn’t find it...

Quote
Hopefully someone [a scientist] will look at it on the longer 2 year time frame added to the 1 year stuff already done, and update it.

I sent this stuff to Mark Serreze and he found it interesting, but said it wasn't his thing. Then this from last year:

Quote
...found that the strong global and Arctic changes depended on the magnitude of water vapor transfer from the mid-latitude oceans to the Arctic. When warm moist air is carried poleward towards the Arctic, it can lead to more low-lying clouds that act like a blanket, trapping warmth near the surface. The poleward movement of heat and moisture drive the Arctic's sea-ice retreat and low-cloud formation, amplifying Arctic warming.

The so-called ice-albedo feedback causes retreating ice and snow to lead to ever greater warming through increasing absorption of solar energy on darker surfaces.

If true for air and moisture, why not water flows, and over longer time periods, of course, and would EN's not enhance this effect?

Not the first time I've been ahead of the curve. I know eff all about the maths and the innards of the models and theories and details of what does what, which many of you do quite well, but I know patterns.

For your consideration.

Cheers

8
Arctic sea ice / Re: Ice edge at minimum poll
« on: April 08, 2019, 11:32:16 PM »
amsr2-uhh jaxa minimum dates, 2012-2018 for comparison.
thanks Oren

9
While AbruptSLR is doing a great job in highlighting potential dangers of climate change, he is focusing on the very low-probability extreme climate change scenarios. If you read the articles he links to, they often focus on hypothetical extreme model runs to show what could happen in the case of runaway carbon emissions. He has recently posted papers with 4 times increases in CO2 concentrations and 5 or 11 times increases in methane concentrations. Those are scenarios well beyond even the extremes of RCP 8.5.
[...]
Also, renewable energy is now cheaper than coal and is quickly becoming cheaper than natural gas and EVs are poised to outsell ICEs in the coming decade. As a result, we're probably going to end up on an emissions path between RCP 2.6 and 4.5.
So there are many reasons to hope. I agree with AbruptSLR and many posters on this site that we need to get off of fossil fuels as quickly as possible and I also agree with the consensus climate scientists that it's not too late. Don't give up hope.

I never read ASLR's posts as a reason for despair. On the contrary: he shows the urgency of taking the collective action that can at this point hopefully still prevent the worst-case risks from materializing. Many mainstream communications focus on current best-estimates, without being or making people aware of the severe fat tail risks. Sutton 2018 proposes to improve on this lack of clear risk communication by using this simple figure below that shows the probability of very high climate sensitivity and its likely impacts, concluding that the highest risk is in the small, but significant chance of very high climate sensitivity and related impacts:
https://www.earth-syst-dynam.net/9/1155/2018/

Not being aware of this risk increases the chance of insufficient collective climate action (mitigation and adaptation), and would therefore increase the chance of eventual depair, in case worst-case scenario's would turn into reality. Since we don't know the real probability distribution for sure, we're in a situation of deep uncertainty, which makes strong climate action all the more urgent as a precaution against finding out that a high climate sensitivity appears to be more likely than mainstream science thought so far.

10
Arctic sea ice / Re: Albedo-Warming Potential
« on: April 03, 2019, 01:19:03 AM »
BAM! Two years have gone by without an update.

I finally have the processsing power and coding skills to take the AWP model to where I intended it to be. Instead of only calculating the anomaly of potentially absorbed solar radiation. I now calculate the raw accumulated values, the anomaly and a percentage of the current year to the maximum possible (complete Ice-free conditions). From the 1980s to 2010s this percentage has gone up from roughly 52% to 62%. Generally from August onwards the Arctic is 75% icefree and from September onwards the Arctic is 90% icefree.

Everything is now much better presented with interactive graphs and sliders to compare individual years. The regional data is already calculated, but needs even more work for proper presentation. Near-real time data for 2019 is in the works too.

Fancy new webpage:
https://cryospherecomputing.tk/awp

Still too short documentation of AWP model:
https://cryospherecomputing.tk/doc.


11
Policy and solutions / Re: Direct Air Capture (of Carbon Dioxide)
« on: March 30, 2019, 03:59:46 AM »
It worries me that we will end up with a Climate Industrial Complex brought to us by the very industries that created the problems:

- Big Oil and Gas: The expertise to build the pipeline infrastructure needed to transport captured CO2, and the drilling expertise to bury it.

- Big Ag: The planting of "CO2 plantations" of switch grass etc. to capture CO2, then burn for energy, then capture the exhaust CO2 and we are back to Big Oil.

- Big Mining: Massive excavations and crushing of the right types of rocks (the best ones in Brazil and India) to be spread across wet ecosystems to be "weathered", capturing CO2 and transferring alkaline to the oceans.

- Big Military: To protect the above installations

All made at a great profit and counted as additions to GDP. Probably wont save civilization but it will surely be profitable trying.

12
Policy and solutions / Re: Tesla glory/failure
« on: March 25, 2019, 09:49:20 AM »
Quote
Note the report stops at Feb 2019, the exact point before Model 3 started bulk deliveries to European customers.

So what? It's an intentional conspiracy is it? Is this what you're claiming - the whole report is "biased" and/or "inaccurate" and/or "flawed data" ... planned to coincide with the long indicated tesla deliveries to Europe?

oren is right, Lurk.
Here is a report from February :

Tesla Model 3 Easily Outsold All Other EVs In Europe In February 2019

Tesla is already the top-selling BEV brand in Western Europe (see report for February) and the latest data provided by industry analyst Matthias Schmidt (schmidtmatthias.de) suggest that the Tesla Model 3 is the top-selling model.

In the last month, about 3,724 registrations of the Model 3 were counted, which is several hundred more than in the case of the second top car, the Renault ZOE. Biggest markets for Model 3 were Germany (959) and Norway (791).

https://insideevs.com/tesla-model-3-outsells-evs-europe/


13
Policy and solutions / Re: Tesla glory/failure
« on: March 25, 2019, 08:00:48 AM »
Sorry to disappoint the Tesla bears here on this forum.

Tomorrow, as I take ownership of a brand new Tesla Model S, Tesla will increase their glory with one more 2019 Q1 sale and delivery, and they will increase their cash flow also.

And I'm really looking forward to never have to pump fossil fuel again !

14
Arctic sea ice / Re: 2019 sea ice area and extent data
« on: March 24, 2019, 10:49:00 PM »
(posting a bit sheepishly as I've not commented yet this year  ::))

Here's my customary max season chart showing this year's path relative to the maximum position of previous years.

15
Greenland and Arctic Circle / Re: The Nares Strait thread
« on: March 24, 2019, 04:03:59 PM »
So, let's break down the variables available: <snippage>
you could add water temperature and salinity
upwelling (probably need FOoW for that) covered by 2 and 3?
air temps have been consistently low but will play a larger part soon, as will solar.

edit: maybe something to be gained from ascat, jan1-mar23 enlarged and enhanced.
It looks like the arch may have been under considerable pressure from the speed of collapse.
(or the ice around it was very weak)

16
Arctic sea ice / Re: Arctic Image of the Day
« on: March 23, 2019, 09:42:14 AM »
A pod of narwhal in the Arctic

17
Policy and solutions / Re: Tesla glory/failure
« on: March 21, 2019, 10:03:57 AM »
Musk: fiercely competitive, personal vanity, childish, erratic, hard to admit personal mistakes, will lie when finds it "necessary". Bad public speaker.
OTOH, genius at thinking out of the box and "design by first principles". Knows his business and his physics. Does not give up when faced with impossible odds. A geek to be proud of. And my wife would add: the only one who is actually trying to do something, and who gives hope (for which he is hated both by those that wait for a revolution and by those who want no change at all).

18
Consequences / Re: Places becoming less livable
« on: March 19, 2019, 02:04:56 AM »
bbr2314, attempting to shut someone down with a highly emotive image is not what I expect in this forum. There is a place for discussion, I myself definitely question the efficacy of some vaccines (e.g. the flu vaccine) while most definitely accepting the efficacy of others (e.g..smallpox, whooping cough, polio etc.). This is not a forum about vaccines, but climate change, so having noted my distaste I will not post on this subject again.

19
Whats the consensus? Is a high snow mass overlaying sea ice a good or a bad thing?

I know that melt-ponding that in turn was partially responsible for the June cliff of 2012, but then again there's an inference for increased protection from top-melt?

I think it depends. If the heavy snow falls early in the freeze season, it will insulate the ice from the cold, preventing it from thickening. If it falls just before the melt season, it may serve to delay the onset of melt.

20
Arctic sea ice / Re: When will the Arctic Go Ice Free?
« on: March 13, 2019, 09:34:45 AM »
I think using generalized volume is a simplification because the periphery and the central arctic behaves quite differently (probably due to bathymetry). Attached is the volume for the CAB only.

It seems to me that we currently have a new "balance" in the CAB (circled) which will probably last until Atlantic warm water intrudes and finally mixes well and then the CAB will be gone. I think it is impossible to know when this will happen  and linear/polynomial, etc. projections are not useful

21
Arctic sea ice / Re: When will the Arctic Go Ice Free?
« on: March 07, 2019, 06:10:43 AM »
JCG's numbers were for June, so you'd get for zero in Sept much earlier than 2068. With these assumptions it should be somewhere around 2048. But an average thickness cannot capture all the required information even for a very basic extrapolation. For that you would need the distribution of thicknesses, compared to the typical melt over the season. If 90% of the April or May ice is less thick than a season's worth of top+bottom melting, you would get a BOE as traditionally defined.

Note this is regardless of trends in extent or area, which could severely lag the drops in volume until the BOE arrives by surprise. This is because winter extent is limited by the geography of the Arctic ocean, surrounded by land on most sides, while winter thickness is dictated by freezing season temperatures. So volume is much more variable (and vulnerable) than extent/area.
High/low max extent is dictated by Okhotsk, Bering, Baffin and Barents - all are external to the Arctic Ocean and completely melt every summer. High/low max volume is sensitive to thickness in the Arctic Ocean itself. So ignoring volume is very risky.

22
Permafrost / Re: Northern Hemisphere Winter 2018-2019 Snowcover / Misc Obs
« on: February 26, 2019, 08:24:20 AM »
Give credit where credit is due.

bbr is right about at least one thing: there was a tremendous amount of snow this year in North America, and SWE is above average in Eurasia too. Of course, as the Arctic is becoming more open it is getting wetter as well so this should not come as a surprise. More open Arctic = more rain coming out of the Arctic and hitting sorrounding areas, mainly Siberia and Canada.

However, for bbr's pet theory to work, this snow should survive the summer which seems very very unlikely to me

23
Arctic background / Re: Antarctic Expeditions
« on: February 26, 2019, 02:06:17 AM »
The N B Palmer is back off Pine island Glacier according to sailwx.
a post from the 24th is probably about activities before the detour to Rothera.
https://thwaitesglacieroffshoreresearch.org/news/2019/2/24/island-days-part-ii-tarsan-partners-with-the-natives-seals

but contains a lot of interesting information about the research.

24
Policy and solutions / Re: Renewable Energy
« on: February 24, 2019, 04:48:45 AM »


Now I wonder why so often the ox is preferred over the horse. What I found on the internets is a bit contradictory. The horse can exert more power in short time (in fact you can work them to death quickly - I've once seen one sweating like hell and almost collapsing after half an hour of timber pulling.). The ox is slower and can work longer (contradicted by https://en.wikipedia.org/wiki/Horse_collar ). I guess the major point today is the price. A horse collar nowadays is way more expensive than the simple ox yoke.


Back in the 1980s I found myself unemployed and at a loose end in the Yukon one fall. So I went to Edmonton where I heard there was plenty of work. I wound up getting an interview at a show jumping and dressage stable because I had a fair bit of experience working with horses (and dogs). The interview however took place in a dark stall where I was informed I had to be acceptable to the biggest animal I've ever seen that was not an elephant.
"Mosquito" was a Holstein ox that was taller than my 6 feet at the withers, and beef to the knees as they say and must have topped a ton easy.
In the dark, Mosquito rose and rose and rose to his feet in the way that anyone who has watched a cow stand up will recognize.
He snuffled me with his wet nose and I scratched him in the 18 inches of space between his eyes and thereby got the job.
I worked with him for six months, mostly mucking out horse stalls.
The advantages of an ox over a horse (which is really the point of this post) are that they have a really low gear- so they can shift a stupendous load at a really slow speed, and their patience- they are really happy to stand and chew the cud for ten or fifteen minutes while one shovels shit into the pick-up sized sledge he pulled.
The main reason Mosquito had a job was his emissions were non-toxic to the very expensive horseflesh whose shit we were hauling.
One day we got to haul a Mac truck out of the ditch in our lane way- very satisfying!

25
Arctic sea ice / Re: What's new in the Arctic ?
« on: February 20, 2019, 06:57:56 AM »
Speaking of hotspots (and forgive me if I missed it elsewhere - I'm brand new here):

Yeah, I've seen that too but I have a different theory then other presented. Check out the continental shelf in relation to this 'thermal' exchange. Also, notice that there is a current of hot water running north along the european coastline for some time even when we get that cool area south of Greenland. Heat is still making its way north and I think that it HAS heated the methane clathrates in the continental shelf area. If you go over to NOAA MetOp-1 and look near the surface (around 930mb) you will see the methane signature.
Methane hydrates are a temp/pressure. When you have heavy release you will change the density of the water above you (i.e. pressure).

26
Policy and solutions / Re: BAU until they peel my cold dead hands from it
« on: February 18, 2019, 03:51:00 AM »
Archimid, Maybe your response is the very definition of BAU until they take my cold dead hands off it.
No people and the rest of living creatures on the planet can't wait for technology to deliver rich people's  large  single driver transportation preferences before they begrudgingly change their lifestyles.
No people can't put off food preference changes, their 6,000 sq.ft. housing preferences heated by fossil fuels, their plane flying habits, their annual vacations to exotic locales, the electric demands of their comunication addictions. BAU by definition.
 If you don't believe we could currently feed everyone on the planet with beans, grains, pulses, rice and vegetables and some fish , chickens and small amounts of pork while at the same time vastly reducing our carbon footprint you'd be wrong.
 If you don't think we could transition to buses for transport within ten years you'd be wrong. If we just banned air transport of food and all but emergency transport of people the planet and society would still get through. If people just changed their housing expectations or shut off all but 600 sq. ft. to heating or air conditioning most people would still survive.
 Problem is people aren't willing to do what is necessary to save this planet. There are billions of people however that already live lives very similar to the restraints I have grossly outlined above. I am quite certain however you aren't one of them. It is your expectations and mine that will cost those other humans untold pain and hunger as climate change proceeds apace and you want to complain about the inevitable war or deprivations instant change would precipitate?  I am sure those other humans would have choice words for you and me but they simply don't have a voice.
 I would take the leap tomorrow , I would take the chance we could muddle through . I'd do it for the other living things on the planet, I'd do it for the suffering we are willing to inflict on others, I'd do it for the future generations we are throwing under the bus. If it meant a couple million rich fucks passed away uncomfortable I'd be fine with that too. Now I probably have the NSA on my ass , thanks !





27
Permafrost / Re: Arctic Methane Release
« on: February 08, 2019, 10:16:04 PM »
"Given the contentiousness of this topic in the scientific community, it may
even be contentious for me to say that there is no scientific consensus on
the sources of current methane emissions or the potential risk and timing of
significant methane releases from either surface and subsea permafrost. A
recent attempt at consensus on methane risk from melting surface
permafrost concluded methane release would happen over centuries or
millennia, not this decade (Schuur et al. 2015). Yet within three years that
consensus was broken by one of the most detailed experiments which
found that if the melting permafrost remains waterlogged, which is likely,
then it produces significant amounts of methane within just a few years
(Knoblauch et al, 2018). The debate is now likely to be about whether other
microorganisms might thrive in that environment to eat up the methane –
and whether or not in time to reduce the climate impact.

The debate about methane release from clathrate forms, or frozen methane
hydrates, on the Arctic sea floor is even more contentious. In 2010 a group
of scientists published a study that warned how the warming of the Arctic
could lead to a speed and scale of methane release that would be
catastrophic to life on earth through atmospheric heating of over 5 degrees
within just a few years of such a release (Shakhova et al, 2010). The study
triggered a fierce debate, much of which was ill considered, perhaps
understandable given the shocking implications of this information (Ahmed,
2013). Since then, key questions at the heart of this scientific debate (about
what would amount to the probable extinction of the human race) include
the amount of time it will take for ocean warming to destabilise hydrates on
the sea floor, and how much methane will be consumed by aerobic and
anaerobic microbes before it reaches the surface and escapes to the
atmosphere. In a global review of this contentious topic, scientists
concluded that there is not the evidence to predict a sudden release of
catastrophic levels of methane in the near-term (Ruppel and Kessler, 2017).
However, a key reason for their conclusion was the lack of data showing
actual increases in atmospheric methane at the surface of the Arctic, which
is partly the result of a lack of sensors collecting such information. Most
ground-level methane measuring systems are on land. Could that be why
the unusual increases in atmospheric methane concentrations cannot be
fully explained by existing data sets from around the world (Saunois et al,
2016)? One way of calculating how much methane is probably coming from
our oceans is to compare data from ground-level measurements, which are
mostly but not entirely on land, with upper atmosphere measurements,
which indicate an averaging out of total sources. Data published by
scientists from the Arctic News (2018) website indicates that in March 2018
at mid altitudes, methane was around 1865 parts per billion (ppb), which
represents a 1.8 percent increase of 35 ppb from the same time in 2017,
while surface measurements of methane increased by about 15 ppb in that
time. Both figures are consistent with a non-linear increase - potentially
exponential - in atmospheric levels since 2007. That is worrying data in
itself, but the more significant matter is the difference between the increase
measured at ground and mid altitudes. That is consistent with this added
methane coming from our oceans, which could in turn be from methane
hydrates.

This closer look at the latest data on methane is worthwhile given the
critical risks to which it relates. It suggests that the recent attempt at a
consensus that it is highly unlikely we will see near-term massive release of
methane from the Arctic Ocean is sadly inconclusive. In 2017 scientists
working on the Eastern Siberian sea shelf, reported that the permafrost
layer has thinned enough to risk destabilising hydrates (The Arctic, 2017).
That report of subsea permafrost destabilisation in the East Siberian Arctic
sea shelf, the latest unprecedented temperatures in the Arctic, and the data
in non-linear rises in high-atmosphere methane levels, combine to make it
feel like we are about to play Russian Roulette with the entire human race,
with already two bullets loaded. Nothing is certain. But it is sobering that
humanity has arrived at a situation of our own making where we now
debate the strength of analyses of our near-term extinction."

https://www.lifeworth.com/deepadaptation.pdf

https://www.nature.com/articles/s41558-018-0095-z

https://arctic.ru/climate/20170809/655109.html

28
Arctic sea ice / Re: 2018 sea ice area and extent data
« on: January 03, 2019, 12:22:24 PM »
To conclude I'd like to take a look at the 365-day trailing average of Arctic sea ice extent.

The average extent of 2018 was 9'919'855 km2, this is:
- 2nd lowest on record
- 203'876 km2 higher than the record year 2016
- 35'785 km2 lower than the 3rd-placed-year 2017
*- All years except 2012/2016/2017/2018 stand above 10'000'000 km2.


The first graph shows the 365-day trailing average in the last 5 years. While there is some fluctuation in the past 2-3 years, the linear trend shows a clear decline. The lowest 365-day-average of Arctic sea ice extent was 30th March 2017 with 9'683'735 km2.

The second graph shows the development of the 365-day-average in 2018. I think the timeframe is too small for it to have any significance, but the trend slightly downward as well.

29
Arctic sea ice / Re: AMSR2 Sea Ice Volume/Thickness
« on: December 09, 2018, 01:56:15 AM »
I've been brooding over PIOMAS volume data the last 3 days, following some discussion elsewhere about trends vs "weather" and the kind.

I'm staring here as I write at 4 graphs I derived from the PIOMAS data downloaded from the U.of Washington Polar Science center.  I'm pondering what it implies about past changes in the Arctic and what import it has for the future.

Let me back up for a moment and describe what I've done first, and why.

There's been a lot of discussion on the Arctic forums recently around three dimensions we use to evaluate Arctic system health.

In our discussions and arguments we've wrestled with the reality that two of those measures - extent and area, particularly as they appear at the end of melt season - have become increasingly difficult to evaluate to make a skillful determination of how the Arctic will look in a few years. Our discussion has shifted and expanded now to where over the last two years there has been much more tracking and examination of the annual refreeze.  This has given us some hints and generated quite a few more questions.

Roll back to what I'm doing now.  I'm using PIOMAS daily volume data going back to 1979 (http://psc.apl.uw.edu/data/)

My analysis is more empirical than theoretical.  At this moment I'm less interested in prediction than I am the data set.  I have a particular interest in volume as well. Unlike extent and area, it represents a far better proxy for key forces at work in the Arctic - heat exchange and total system enthalpy.

My second purpose is contrast volume changes with changes that have taken place during the time period in question and see if a pattern appears which follows or is affected by them.

Methods:

Simply digesting a raw and fairly substantial pile of data is unlikely to produce anything useful.  However, I don't want to fall into the trap of over-analyzing the information - while it is good to reduce "noise", over-processing values can remove meaningful signals it contains.  My approach to this is three fold.

1) Create a sample average from a meaningful but more controllable time frame.

Most analysis of this data has been around extreme endpoints in annual variation - the annual maximum extent/area/volume and corresponding minimum - which land on arbitrary dates and are very narrow samples.  For my work here, I've picked to arbitrary but significant dates March 21 (Day 80/81 of each year) and September 21 (Day 260/262).  I then averaged the daily volume for a time frame window which extends from two weeks before until two weeks after those dates to get what I call "Vernal" and "Autumnal" volume numbers for those dates.

My logic in doing this is this: Rather than use a metric which is volatile and fundamentally disconnected from other forces in play at the time they take place (annual minimum/maximum), I wanted to anchor the analysis to two specific points in them where we know predictable and measurable changes are taking place (the Spring and Fall equinoxes).  Further, to make the new metric sensitive to conditions during the specific year and season, rather than simply pluck out one number, an average over a near-term time frame would better incorporate and smooth other signals from forces in play at the time.

In addition to these two numbers, I also created a baseline value for tracking behavior on a broader time scale.  In this case, I created an annual average for each year, summarizing all volume measurements from January 1 to December 31 for each year in question.

2) Create a derivative average which further smooths the Vernal and Autumnal numbers over a wider time frame. 

In this case, I created a second data set from my spring and fall averages, starting with 1983, which is a simple 5 year running average of those numbers.  The goal here is to round off peaks and valleys without losing all of the signal they contain, and hopefully permit underlying trends to be more visible, and more importantly, better identify transitions in system behavior.

3) Create a third derivative/index to show system volatility.

At the start, these were actually the numbers I was most interested in. We've discussed this some on the forums, but the summary of my thought here is, this, and also may qualify as a hypothesis:  As the Arctic as a system approaches behavioral limits, the volatility of the system - the relative change against base values - will increase.

Again keeping it simple, I created three values for each year in question.  These were (a) The absolute difference between Vernal and Autumnal values (b) the Percent that value represented of the Vernal volume and (c) the Percent that value represented of the Annual volume as derived in (1) above.  I did this for both the raw and 5 year running averages of Vernal, Autumnal and Annual values.

Note: all values I used were rounded up to three decimals. I figured the significance of fractional cubic KM of ice were meaningless based on the confidence of the measurements.

Findings:

From raw data and graphic analysis by Jim Pettit, Zach Labe and many others it's already clear that sea ice volume has been declining steadily over the time period in question.  What isn't necessarily clear is the nuances of how those changes have taken place.

Both the smooth and averaged data clearly shows this trend. No surprises (nor were any expected).

However, annual seasonal loss has shown only a very modest increase - less than 10% over all - with an average of 14.242K KM3, median of 14.034K KM3 and deviation of 1.164K KM3.  Breaking the loss dataset in half shows the 2nd half loss rate only increasing by about 1000KM3, and 2nd half loss volatility actually declined slightly. The 5 year running averages are correspondingly closer.  This suggests strongly that large year to year variations in melt are not significant contributors to the reduction in volume over the period measured.

The first think that jumped out at me in particular in the averaged data, is I think I'm seeing two historical locations where I think there's a signal identifying a fundamental change in how the system behaves.  The first is in the 1990-1994 time frame. There I think spring, fall and yearly average graphs start a break in slope, falling into the glide path that takes us down hill to where we are now.  I'm not sure what the specific conditions were at the time, or, considering hysteresis, how far back we need to look for the trigger, but it strikes me that is a specific place in time and space we can point at where the system signals a change has taken place.

The second was the 2010-2013 time frame.  in that range all three measures - Annual average, spring and fall - flatten out.  As another interesting and possibly key item, annual loss intersects and then starts to follow the annual average curve.  I'm not sure what this means yet, but it sure looks like a strong signal.  Also, while the three major curves flatten, the *vernal* curve is still trending down.  I think the running 5 year equinox graph shows this the best.

My general take away - I think the graphs support another of my thoughts - that as the total energy available to the system increases (reduced ice), the overall volatility of its metrics will increase - especially area and extent - which actually are more derivative of this than volume.

I'll be interested to hear what other folks think.  If someone can point me in the right direction, I'll post the spreadsheet with my raw numbers someplace for people to tear apart.

 (P.S. - the average volume will be off a bit for 2018 as we haven't finished the year.  That said, we are far enough along it that the relative change is small enough to be negligible to my analysis.)

30
Arctic sea ice / Re: Arctic Image of the Day
« on: December 05, 2018, 04:19:37 PM »
Am I the only one that checks in with the webcam in Utqiagvik to see if the house on the left hand side of the image has its door wide open again?  It's cold up there.  Why is the damn door open so often?  Maybe we should call them to let them know?


31
Policy and solutions / Re: Tesla glory/failure
« on: November 29, 2018, 06:34:52 PM »
More Tesla jokes.....
Meanwhile, the Tesla 3 is NOT a joke & is better looking than all previous Teslas..... plus all other viable EVs of ANY brand, which is a delight to potential buyers who put $1000 on the line, two years previously. Tesla 3 is very efficient (tho I may hold out for a 64kWhr Ioniq). Tesla 3 has innovations other brands don't have, all backed up by in-house battery & solar cell energy productions. Those complaining about Tesla have to be short sellers.
Tesla colors have to get strong 3-D metal flake paints, like so many other brands also need.

32
Arctic sea ice / Re: The 2018/2019 freezing season
« on: November 25, 2018, 03:52:21 PM »
A comparison of Chukchi ice extent from 2015-2018, nov1-24 using amsr2-uhh.
The main ice edge for each year from 2015-2017 has been extracted using edge detect in imagej, then splitting the colour channels to remove some of the concentration data, so it should be seen only as a rough comparison.

33
Arctic sea ice / Re: 2018 sea ice area and extent data
« on: November 21, 2018, 04:04:44 PM »
Another interesting statistic to show the uniqueness of the current refreeze. The table shows the extent changes (JAXA) in the last 30 days (Oct 21 - Nov 20). 2018 is leading with a margin of over 400'000 km2 and the extent gain was over 1'000'000km2 higher than the 2010's average!

Another note I'd like to make is that the table considers all years from 1979-2018. Out of the years in the top 10, there are 4 from the 2010's, 4 from the 2000's and only 2 from before 2000. This shows that there are times of the year where the refreeze is actually going up, rather than down like the overall extent trend.

My theory, and please correct me if I'm wrong, is that this is the effect of the increased summer melt in the central seas. Especially the CAB, Laptev and Kara lose way more ice in summer than they did 20 years ago. But because of their northern and central location, they still refreeze 100% in winter anyway. But this (usually quite fast) freeze of those seas was around early October 20 years ago, it's now happening in late October and November. Therefore the upwards trend in October - November sea ice gain.

34
Policy and solutions / Re: Extinction Rebellion
« on: November 02, 2018, 12:48:07 PM »
Hi I am a longtime lurker. Inspired by a post on Jason Box's Twitter feed I was one of the 1000 people at the Declaration of Rebellion for Extinction Rebellion on Wednesday. It was a glorious autumn day and I felt privileged to be at the start of something so significant. https://mobile.twitter.com/extinctionr

35
Policy and solutions / Re: Tesla glory/failure
« on: October 29, 2018, 02:43:40 PM »
An interesting and well-written article by Paulo Santos, both short-side and not short-side.

And if you read the article carefully, you realise the gap between Tesla shorts and Tesla optimists.

Tesla shorts believe that Tesla is overvalued as a “car manufacturer”.  Yep I’d say that this is quite correct.  But, you see, Tesla is not “just” a car manufacturer.  Tesla manufactures the batteries for their vehicles but also for other energy sequestration projects including the smart home.  Tesla is in the process of manufacturing Semi’s which will become the leading EV  heavy vehicle in the world.  Tesla are also a vehicle software and processor manufacturer.

Over and above that they also have a charging station network.  If you think about it Tesla produces the cars and provides “gas” stations for the cars too.  They will do the same for Trucks.

Then if you factor Solar City into the mix, Tesla will provide the products to generate the “fuel” for the vehicles and provide home fuelling stations, on street fuelling station for the vehicles they produce.

Then the shorts value them as a “car manufacturer”.

Is it any wonder the markets are split right down the middle. Those who are investing for the future shape of Tesla are pricing it high.  Those who just want to make a quick buck and get out, potentially taking Tesla down with them, only value Tesla for what it cannot make a profit on today.

Solar City will, eventually, become a key critical pillar in the Tesla low emissions landscape.  Unless the shorts kill the company before they get there.

This is the core/crux of the problem between the shorts and the bulls on Tesla.  The bulls know what it is.  The shorts don’t care what it is, they just want to sell it as another failing car manufacturer and make a fast few billion on it.

36
Consequences / Re: Global Surface Air Temperatures
« on: October 23, 2018, 06:37:31 PM »
I must say, I dont understand the reasoning behind Hansen's graph. The minimums are compared with the latest reading, which is closer to the linear trend than then minimums (or course - since the minimums are below the trend and max are above... And we are currently in between). So drawing lines from the minimums to that end point will show steepening lines even if the minimums stay the same distance between the linear trend line.

Its geometry, or even mechanics. You have a line that runs underneath a pivot point, connect a sliding rod through a point attached to that lower line with the other end attached to that higher pivot point. Now slide the bottom point along the lower line and reproduce this exact graph.

I dont get it - but as a not particularly knowledgeable random person on the internet I'm happy to be proven wrong!

Edit: If the latest data point IS a minimum, and therefore a minimum higher than the others, that's surely just one point and not particularly evidence of a trend surely. Connecting those other points to this one still doesnt look valid scientifically.

37
Arctic background / Re: Arctic Maps
« on: October 06, 2018, 12:25:00 AM »
Reposted from Artic Cafe thread

Test your knowledge of the Arctic seas, basins and shelfs in this 100 piece puzzle i made of a map Uniquorn posted.

https://www.jigsawplanet.com/?rc=play&pid=0a4eb46199b7

38
The rest / Re: The Trump Presidency (was "Presidential Poll")
« on: September 27, 2018, 04:48:15 PM »


Some girls didn't need to be drugged to get into it. Ever been to Spring break in Florida folks?


The problem with Kavanaugh isn't that he drank and had sex in high school.  The problem is that he's shown himself to be the unrepentant product of rich white male entitled chauvinistic jock frat prep-school bro culture.

My educational trajectory put me into regular contact with this culture and its denizens for 10 - 15 years.  Sounds like a prison sentence.  I was more drawn to the anti-war hippie counter-culture types.  By the time I got to college, this youth culture was rapidly evaporating.  Pity.

The parties we've been reading about, the ones of Kavanaugh's youth, weren't notable for the alcohol and sex, they were notable for targeting women to intoxicate and, since they were then unable to give consent, gang-rape. 

He grew into respectability, but there's no sign he ever had any epiphany about the culture he came from.   We can see this in his paternalistic yet vigorous refusal to let a 17 year-old immigrant obtain medical care and abortion:

Brett Kavanaugh's One Abortion Case
https://www.aclu.org/blog/reproductive-freedom/abortion/brett-kavanaughs-one-abortion-case

This rich white entitled male bro culture is part of why so many Americans (and others around the world) suffer.  The stories that are now dogging Kavanaugh are broadly consistent with each other and with the toxic culture I observed during my educational years.  This is a segment of the entitled culture that refuses to take personal responsibility for our shared global environment.  As it ties in with sexuality and gender relations, we can see it in stories from the new movement unfolding now:

I couldn’t stop reading #WhyIDidntReportIt stories. Then I realized why.
https://www.washingtonpost.com/local/i-couldnt-stop-reading-whyididntreportit-stories-then-i-realized-why/2018/09/26/6dff450c-c109-11e8-90c9-23f963eea204_story.html?utm_term=.5fc2bd38a1e0

"In the last week, women and men who have experienced sexual abuse at the hands of others have started doing what they haven’t been able to for years and decades: admit something unfair and awful and damaging happened to them.

Just search for #WhyIDidntReportIt, or variations of that hashtag, and their stories will come barreling at you as confessionals, some containing only bits of details and others spilling out in their complete and painful-to-read messiness."

This chauvinistic, ultimately abusive culture is part of the problem.  Kavanaugh is an unrepentant product of it.

39
Arctic sea ice / Re: When will the Arctic Go Ice Free?
« on: July 30, 2018, 05:23:40 PM »
Btw-

The point here is that messing with high CO2 and CH4 levels is extremely dangerous. In gaming terms (and no thus isn't a game, that is the name used from studies that were developed during the Cold War), this is a "non zero sum game". And isn't the nice version where most or everyone wins. It is the nastiest version where nearly everyone loses.

Should we be so foolish as to push the Earth hard enough to trigger methane and tundra releases, the "game" is over. The Earth flips in a highly non-linear response to a wholly different environmental state - the hot Earth state. And in the long history of life on Earth, the greatest amount of time has been in either the hot Earth or cold Earth states. It has been relatively rare for the Earth to sit in a quasi stable condition between those two extremes.

The shift from one state to the another seems to always be catastrophic for life as it exists, but ultimately beneficial for life and evolution. Our existence as complex intelligent life may well be the direct result of these episodic catastrophes.

But that doesn't mean either that mankind will or would survive such a transition. Ignoring those risks and pumping immense stores of carbon into the atmosphere seems to be the major cause for transition to the hot Earth state, whether by asteroid impact, or supervolcanic flood basalt eruptions. 

40
Arctic sea ice / Re: When will the Arctic Go Ice Free?
« on: July 30, 2018, 04:56:39 PM »
Gerontocrat -

If we trigger the release of the ~1,600 gigatons of carbon in the methane and carbon stores of the Arctic planes and the tundra, it is game over. The earth will go to the hot earth stable state. The Arctic will melt rapidly. The Antarctic will take substantially longer, but will also completely melt before CO2 levels can reduce.

Once that happens, the Earth reenters a climate state that we do not understand how to model - the equable climate. That isn't a bad place once we get there. The pressure is higher along with O2 percentage (30%) and temperature. Wet forests burn in the rain. Giant insects become common as O2 transport becomes easy.

The problem is in getting there. In the interim, the oceans go anoxic. O2 levels plummet to 14%. Large animals die from insufficient O2 unless they have extreme high altitude adaptations. Iron falls out of the oceans. Shelled creatures all but vanish as the oceanic pH falls. All of the biomes are disrupted and most species die off leading to an evolutionary explosion as the survivors move to fill all of the vacant evolutionary niches.

In the end it becomes a massively good thing as new life flourishes on the graves of the last failed attempt. New adaptations take over and dominate.

The problem there is that we only have about 500 million years left to leave the Earth before we begin the terminal slide to a lifeless Earth as the goldilocjs zone moves outward with an ever hotter aging sun. By 750 million years, large life cannot exist. By a billion, life is done as the thermal runaway begins.

41
Arctic sea ice / Re: The 2018 melting season
« on: July 19, 2018, 09:39:52 PM »
For 2018 the thing that REALLY surprises me is the Bering sea.  The straight never fully froze over, and was open in February. The ice edge was so far back from what it normally is.  Many articles were written even outside of sea ice geek circles about how unusual it was.

But the ice edge has moved back so incredibly slowly in the melting season it's getting close to normal there. What the heck happened?  Where did all that extra insolation go?  Was that heat shuffled off somewhere else (like out?)  I was almost sure all those warm bering sea waters would cause all kinds of melt and it absolutely didn't materialize.

42
Arctic sea ice / Re: Latest PIOMAS update (July mid-monthly update)
« on: July 19, 2018, 11:47:05 AM »
Here are several regional charts based on the data from Wipneus. This time I am focusing on this year's laggards - Kara, Beaufort and the ESS, in addition to my usual chart summing up all the regions typically participating in the September volume minimum.
As can be seen, Kara has done some catching up, Beaufort and ESS are still lagging, and the "Inner+" is still keeping up with the leaders.

43
Arctic sea ice / Re: Latest PIOMAS update (July mid-monthly update)
« on: July 19, 2018, 10:42:54 AM »
The volume and volume-anomaly graphs show the melt in July is higher than most until now.

44
Arctic sea ice / Re: The 2018 melting season
« on: July 18, 2018, 04:58:28 PM »
Can anyone explain me how it is possibble that the past 3 winters were the warmest "ever" in the Arctic and yet summers are not much to talk about. Where does the extra heat from winter go? Why does it not show up in big extent losses later on?
Where the extra heat in winter goes is out of the atmosphere, replacing heat that would have come out of the Arctic Ocean.

The result is, less ice being formed.

Less ice forms in peripheral seas that normally contribute to early extent loss.  Ice doesn't thicken as much in central regions.

QED, the heat isn't melting more ice.  That energy budget annually is actually pretty much fixed by insolation.  It's gone up slightly, but that has more to do with increases in heat imported via currents, which doesn't vary as dramatically over the year as does insolation and weather.  However, you can see looking at Jim Pettit's excellent graph that average annual ice loss has only increased by about 15% or so, and any given year can vary as much as 10-15% above or below that average.

The annual maximum is where the story really rests - that's decreased by around 40%...

http://iwantsomeproof.com/extimg/siv_annual_max_loss_and_ice_remaining.png

So in that context, even with our recent very warm winters, what's happening this melt season with an apparently "anemic" melt is entirely within the kind of deviation range I'd expect.

45
Arctic sea ice / Re: The 2018 melting season
« on: June 29, 2018, 10:51:40 PM »
Here's how the CMOS microwave maps look for the past 40 days.

Downloaded from: https://seaice.uni-bremen.de/data/smos/png/
...
There is a definite trend from beige to other colours: dry -> wet

I played around a bit with those SMOS images.  I wrote a script to download the daily SMOS images for June 2010-2018 and to count the number of beige pixels in each image:




Average for the first 28 days of June:

(For what it's worth...)

46
Why bother discussing the merits of incrementalism when it has already failed?

How long ago has it been since climate change has been understood? And in the mainstream discourse? The 80s, 90s? How far has incrementalism gotten us in the last three decades? We’ve almost doubled the amount of emissions in the atmosphere. Littered our oceans. And destroyed much of our soil.

It’s simply too late for incrementalism. Because a significant part of the world will feel the devastation of climate change. Incrementalism is only a concept that serves wealthy nations.  An idea that justifies the costly lifestyle of westerners, while simultaneously ignoring the grim reality for the rest of the world.

Try doing this.

Go to Bangladesh and talk to the people that are about to get their communities swallowed by the sea and tell them this:
“Hey, sorry that your entire life is about to be washed away. Don’t worry, once Elon builds me an electric car everything will be fine.  Thanks for the shirt by-the-way, it fits perfect. Barely cost me anything”

Or go talk to an inuit person whose community is sinking into the permafrost:
“hey, sorry your way of life is being evaporated into the atmosphere. Don’t worry though, natural gas plants are replacing coal plants. Thanks for all the land by-the-way. Didn’t cost us anything”

This is incrementalism: I will not make any substantial sacrifices to combat climate change. The economic system that supports my lifestyle is sacred and must not be changed.  And the suffering of exploited persons is an acceptable sacrifice to the problem.

----------------

Incrementalism has more challenges than just technological fixes. It is the political and social implications of maintaining the status quo.

Incrementalism is liberalism. The idea that our society can make progressive change while maintaining existing class structure. Liberalism worked great in the post-war era when we had essentially unlimited resources and labour to exploit. Liberalism requires stability. Something that is no longer being afforded to us. Our economy and environment are quickly deteriorating. And liberalism does not have the proper tools to deal with our current challenges.

Do you think that the rise of right wing extremism is simply a passing phase? Do you believe trump became president by accident?

Will the climate change induced refugees make the world a better or worse place? Do you think the nationalist will have a change of heart when they have millions of coloured people knocking on their door?

Dealing with millions of refugees is not something that is done ‘incrementally’. You either open your arms or you don’t.

The world is convulsing. And liberalism and ‘incrementalism’ is not equipped to handle this type of crisis.  It is the extremes that will prevail. Reactionary vs. equality. Fascism vs. Socialism.   It is the arrogance of western exceptionalism that our societies are impervious to hate. The faster you realize that the redistribution of wealth is the only option solving the crisis, the less likely we are to degenerate into fascism.  And I can give you countless examples in history where the ‘incrementalists’ (Liberals) either cowardly kept their mouths shut or joined the fascists.


Today is the day you decide to be on the right side of history. Hindsight will buy you nothing.

47
Arctic sea ice / Re: The 2018 melting season
« on: June 21, 2018, 08:35:17 PM »
So I've been thinking about the apparent "slowness" of this year's extent behavior, and have come to the conclusion that a lot of it has to do with the Kara Sea. This is something that has been predicted in advance - a high volume calculated by PIOMAS during the max volume season made the ice less susceptible to early melting.
I've compiled a few charts to help drive that point home. Almost regardless of the current conditions, Kara volume and extent are expected to mostly disappear by September, potentially putting 2018 back in the race among the low extent years.
The first chart shows how 2018 maxed out very high on volume. But June started with impressive melting, and I expect this year to join all other recent years at the bottom later in the summer. Data courtesy of Wipneus.
The second chart shows how on day 135 (mid-May) 2018 had the highest Kara volume since 2005, even though on day 45 it was among the 5 lowest years. But on day 166 (mid-June) it's already correcting, though still very far from the leaders such as 2012 and 2016. And on day 260  (~minimum), all years since 2004 had virtually zero volume.
The third chart shows how extent in June has started to be highly variable in the Kara since 2010, but regardless of this variability has been highly consistent and very low at minimum.
Bottom line - 2018 has a "bank" of 300-400k km2 of extent that it could use to get back in the leading pack.

48
Arctic sea ice / Re: How soon could we go ice free?
« on: June 16, 2018, 06:07:27 AM »
How soon could we...? Within a week or so, if we really wanted to.

49
Arctic sea ice / Re: The 2018 melting season
« on: June 16, 2018, 12:17:10 AM »
Quote
What  a "blue-ocean" event would look like?  some possibility this 2018 melting season. Does it look like  any of these?
No. The key items to consider are the 2007 and 2012 ice age youtubes. They have been posted here dozens of times. Many people here are overly focused strictly on thermodynamics and single-point summaries of the entire Arctic Ocean, such as a number for area without regards to how that area is distributed. However that distribution is critical to end-of-season.

In those record years (and most others), while thermodynamics plays a decisive role in setting the stage, when extent gets low, winds become the decisive agent via both dispersion of ice to scattered more vulnerable floes, rapid advection to places where the ocean surface water is too warm, and out-of-basin export.

This results in a September picture resembling a comma ","rotated 180º CWwith its tail in the Chukchi and ESS. As with 2018, the lower CAA is the source of this residual ice which was initially about the oldest and thickest left.

Given enough weeks of a quasi-stationary high centered off the Beaufort with an associated westward wind along the Alaskan coast but not a return gyre (a frequent pattern this spring), another 2007 will develop, in conjunction with strong FJL-SV and Fram export.

However pack strength and ice thickness are drastically reduced today relative to 2007 whereas surface water is warmer and freeze-up much later. There's no requirement for another GAC black gray swan event though one would certainly contribute.

/*/*/*/*

The whole question of 'first blue ocean' is ill-posed to begin with. It just kicks the climate change can  down the road. We should be talking about the knock-on effects of the partially blue ocean  already the current reality. No significant effects at 25% ... 50% ... 75% blue ocean?

For example, the Chukchi Sea has open water 11.5 months of the year now. Surely that is way past 'seasonally ice-free'. Who here can remember a meaningful winter ice cover of the Barents Sea? It is actually part of the officially defined Arctic Ocean but now gets thrown in with the Greenland Sea or even North Atlantic. 

The discussion on some forums reminds me of one soccer team moving their goal post into the grandstands and even out to the street but the other team somehow not noticing and still playing up to the newly contrived set-up. They'll never score a blue ocean goal because the goal post will then be moved to "twelve months for five consecutive years". After that, thirty years of stats needed to rule out "natural variation". Then more decades to rule out cycles.

Meanwhile we're already in big trouble now from Arctic amplification, with more of it baked in. Whatever the full effects of an altogether missing 'planetary refrigerator' might be, the partial effects of a diminished planetary refrigerator are already upon us. And that's just the albedo part ... there are many other adverse considerations in the literature.

50
Arctic background / Re: Arctic Maps
« on: May 14, 2018, 07:40:23 PM »
Slightly OT but interesting:
Greenland’s Hand-Sized Wooden Maps Were Used for Storytelling, Not Navigation
<snip>
Quote
On February 8, 1885, a hunter named Kunit approached Holm (Danish explorer) with a driftwood carving he had made—a representation of unbroken coastline that could be flipped around as one followed the contours of the coast. “[Kunit] had carved the chart himself and declared that it was not unusual to make such charts when one wanted to tell others about regions they did not know,” Holm wrote. The hunter produced three maps in total, now collectively referred to as the “Ammassalik maps.”

One carving, 5.5 inches in length, is highly detailed, embedded with all sorts of information and place names for the fjords above and beyond the 65th parallel. It even indicates locations where a traveler would need to carry his kayak overland to get to the next fjord. Another carving measures a little over 8.5 inches long and depicts a specific chain of islands along the coast, connected by narrow stems. These two maps could be placed next to one another to demonstrate the relative positions of the islands along the coast. A third, smaller map was also commissioned by Holm and shows the fjords stretching from Sermiligaaq to Kangerlussuatsiaq and includes valleys, shores, and inlets farther inland. Holm never actually traveled through the regions represented by the maps, but they helped him get a larger understanding of the local geography.

Much more, including pictures and video, at the link.
Atlas Obscura

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