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Messages - josh-j

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Arctic sea ice / Re: Global sea ice area and extent data
« on: February 07, 2018, 10:42:16 PM »
Why is it that the lowest extent is during January and the highest during the summer months on the above graph?

That graph is for global sea ice, so includes both Arctic and Antarctic sea ice. So the low period is during the antarctic summer.  :)

Arctic sea ice / Re: The 2017/2018 freezing season
« on: January 31, 2018, 07:47:53 PM »
The sea ice models already have ice movement built into their models. 

But perhaps not the acceleration of said movement.  ;)

How did you derive that answer, Neven?

I would humbly suggest that Neven's answer is derived from the paper he linked to. :)

Arctic sea ice / Re: Stupid Questions :o
« on: January 02, 2018, 09:05:57 AM »
Hi Emil,

I can't speak for others, but it might be worth noting that PIOMAS volume was at a record low for the first half of 2017 as the graph shows. So I think it is not as simple as saying that volume is up from last year. I suppose it depends on which part of 2017 you're talking about!

Walking the walk / Re: Pat yourself on the back
« on: December 01, 2017, 07:49:18 PM »
Thanks Etienne, that is a very interesting study. I particularly like the details about older furniture design like winged or hooded chairs.

My house is very badly laid out for heat because previous owners removed dividing walls and made the whole ground floor open-plan. If I live here long enough I might reinstate the old walls so I can trap heat in the living room.

Walking the walk / Re: Pat yourself on the back
« on: November 29, 2017, 07:54:20 PM »
This could be a good idea if it can encourage others to take steps too. But I don't want to make myself feel like I'm doing enough!

Anyway, I started taking a flask and cup to work for exactly the same reason. There are drinks machines in my office disposing endless plastic cups (for free) and half of them end up in the general waste so yeah, not good.

This year I am trying to see how much gas I can save by not heating my house (as low temperature as I can manage). I live in northern England and while its no Arctic, it can get pretty chilly (currently just below freezing outside) and my house is old. So it is now 8-9c inside the house. I do not recommend people go to this extreme (especially depending on health) but it has made me think about how what we consider as essential are really luxuries if we were really to treat climate change with the urgency it deserves. I have a warm sleeping bag wrapped around me and wearing 6 layers of clothes because I'm sitting at my desk. Only my hands are cold... :) (also, I've been using this as a way to talk about the environment to my work colleagues - it is lighthearted as they think I'm mad, but it means I can talk about things like decarbonisation!)

The rest / Re: Is Degrowth necessary for Decarbonization ?
« on: October 30, 2017, 09:25:43 PM »
The above is based on internet searches and a bit of spreadsheet work - by an amateur. Is there any professional/academic work along these lines - or is this blocked by scientific reticence? I know there are degrowth conferences but these don't seem to have a high profile.

I don't know about published papers, but Kevin Anderson has been pretty clear in his many presentations on climate change over the years that climate targets built around "green growth" and so on are not compatible with scientific reality. I get the feeling that he is one of the rarer voices in the scientific community saying so, but he would probably respond saying that other scientists would agree privately but not publicly. He is, I think, blazing an important trail.

His website is here, and several of his talks are on YouTube.

Incidentally it was Anderson, among others, who really kickstarted my journey into climate awareness. He doesn't seem to pull many punches.

Arctic sea ice / Re: What the Buoys are telling
« on: October 17, 2017, 04:43:36 PM »
I'll continue to hope that all winter, but I'm feeling pessimistic. Oct. 3 is pretty early for a last picture of the season from O-Buoy 14. Last year we had some from November, though the battery situation may have been different at that time. If it wakes up again next spring I think I'm going to have to throw a party to celebrate.

The batteries are not really holding much charge now given that the buoy was turning off regularly in the dark as winter has drawn in, so I'm optimistic that the early loss of images is due to the batteries only.

The question is what happens to the rest of the hardware in the long cold I suppose! Fingers crossed.

Consequences / Re: Places becoming less livable
« on: August 04, 2017, 06:01:31 PM »
Extreme heat warnings issued in Europe as temperatures pass 40C

Eleven southern and central European countries have issued extreme heat warnings amid a brutal heatwave nicknamed Lucifer, with residents and tourists urged to take precautions and scientists warning worse could be still to come.


The highest temperature on Thursday was 42C in Cordoba, Spain, and Catania, Italy. Split in Croatia also hit 42.3C on Wednesday. The spell is forecast to peak at the weekend with temperatures of 46C or higher in Italy and parts of the Balkans.


Writing in the journal Environmental Research Letters, the scientists said if a similar “mega-heatwave” to that of 2003 were to occur at the end of the century, when average temperatures are widely expected to be noticeably higher after decades of global warming, temperatures could pass 50c.

Concerning note at the end stating there is forecasted to be a fall in agricultural production in Italy as a result of this heatwave.

Arctic sea ice / Re: Operation IceBridge - Arctic Spring 2017
« on: July 29, 2017, 12:13:12 PM »
Where global warming gets real: inside Nasa’s mission to the north pole

Thanks Andre, that was a brilliant article!

Arctic sea ice / Re: What the Buoys are telling
« on: June 17, 2017, 09:56:50 PM »
The correlation between footprints and CO2 spike... I mean could it be? That is amazing!

Arctic sea ice / Re: What the Buoys are telling
« on: June 02, 2017, 02:48:42 PM »
The odd bouncy temperatures today are mirrored by bouncing battery voltages, high battery current and power draw. Obuoy 14 is struggling to stay alive I think.

High current draw could be due to extra sensors turning on; Ozone charts started updating on June 1st with a corresponding current draw for that in the Loads section :)

I'm more attached to this persistent little buoy than I ever was to the Mars rovers!

Arctic sea ice / Re: How soon could we go ice free?
« on: May 30, 2017, 07:55:46 PM »
I'm really sorry for my posting. It's just that im terrified a  BOE could really destabilise the planet. That and climate change seems to be here already and speeding things up.

I really don't think we have a year left due to abrupt warming and some runaway effects stacking up.

I'm no expert but I don't think its inevitable that we will have a BOE this year, far from it - let alone that having one would immediately end our civilisation. Who knows, maybe there is a chance of all that happening in one year... but surely a low chance. The BOE itself could happen if we are unlucky, judging by ice volumes, but nothing is certain.

Try to change our world for the better; don't wallow in despair to the point of paralysis.

The only certainty is that if all of humanity had your level of concern, we'd already be well on our way to fixing the problem.

Policy and solutions / Re: The Cost to Mitigate Climate Change
« on: May 29, 2017, 09:40:05 PM »
Wili and Rboyd are spot on in my opinion. This graph only represents technological solutions, and I am not convinced technical measures alone are enough. In fact it seems to me that technical measures are far from enough, and what we really need is a restructure of the way the economy works so that it doesn't require constant growth.

That said this is still important and we need all the solutions we can get. It just seems as though there should be another huge bar in the graph representing efficiency not in technical products, but in how we actually buy and use things in the first place. Efficiency savings through not producing and trading millions of plastic bottles filled with water, through sitting under electric heaters in cold weather outside bars, through structuring society in a way that means people have to commute long distances in polluting vehicles to get to work, and on and on and.....

Eric's latest and probably last comment on the Stoat blog also confuses matters further, because first he dismisses Rob's critical analysis as "nonsense", but then he takes his time to repeat that "we assume, in effect, that most of the trend in Z200 is "natural variability"."

Which is exactly the assumption that many here have expressed serious doubts about.
(emphasis mine)

I think it is worth taking the bolded section above in context:

: Eric Stein
There is one aspect that might be worth discussing, which is that we assume, in effect, that most of the the trend in z200 is “natural variability”. (We don’t actually assume it — that’s a result of the analysis, but in the end it amounts to the same thing, pretty much). But this doesn’t come out of nowhere! it comes largely from our previous work published in 2014, showing that the trend in z200 is related to tropical forcing.

The 2014 paper is, I believe, the following:

Ding, Q. H. et al. Tropical forcing of the recent rapid Arctic warming in northeastern Canada and Greenland. Nature 509, 209-212 (2014).

From the abstract:
Here we show that the recent warming in this region is strongly associated with a negative trend in the North Atlantic Oscillation, which is a response to anomalous Rossby wave-train activity originating in the tropical Pacific. Atmospheric model experiments forced by prescribed tropical sea surface temperatures simulate the observed circulation changes and associated tropospheric and surface warming over northeastern Canada and Greenland. Experiments from the Coupled Model Intercomparison Project Phase 5 (ref. 16) models with prescribed anthropogenic forcing show no similar circulation changes related to the North Atlantic Oscillation or associated tropospheric warming. This suggests that a substantial portion of recent warming in the northeastern Canada and Greenland sector of the Arctic arises from unforced natural variability.

I think if we have doubts about an assumption of natural variability in Z200 (I have no idea myself), it might worth looking at this paper, not just the 2017 one. I could not find it at a glance outside of the paid Nature publication however.

If I am reading the original graph correctly, it is not indicating a slowdown at all.

This is easy to misinterpret because it shows the anomaly on a yearly basis, which is still increasing.

So, while there appears to have been a sharper year-on-year increase previously, we are still at the maximum per year change.

Even if the graph were to completely flatten out, we would still be dropping per year at the maximum observed rate of ~ 750 k km^2

If you're referring to Tamino's graph, I think it is showing the cumulative anomaly, not the rate of change. So an anomaly of -1 would mean 1 less than normal. not a rate of change of -1 per unit of time.

The forum / Re: Neven's "TIP JAR"
« on: March 08, 2017, 11:48:46 PM »
Thanks for all your hard work Neven - all the ASIs (ASIF, ASIB and ASIG) are great resources and I check this forum daily so its probably about time I paid my dues. :)

The rest / Re: 2017 open thread
« on: March 02, 2017, 02:49:04 PM »
Cid, I will choose to live my life in such a way that I can die with the satisfaction of knowing I tried all I could to prevent or limit a terrible catastrophe and with hope for the goodness of human nature.

If we fail then so be it. But to go to the grave having done sod all to attempt to limit such a disaster as we are facing is a terrible thought to my mind. Even if it were clear that this is inevitable (I do not think it is really even possible to know that at this point, even though the prospects aren't great), I would still gain far more satisfaction in my life from actually trying to do something about it anyway, and die happier knowing I represented the final burning flame of human optimism for all that we love.

I do not wish to go quietly into the night

The rest / Re: 2017 open thread
« on: March 01, 2017, 01:07:58 AM »
Nevertheless 5to10 is right; giving up on the assumption that nothing will work misses the potential we humans have to act differently.

Collective action won't come about through data alone. People need to grasp the issue emotionally and also be able to see a way forward so as to be moved to action rather than denial or despair. It's something I expect many posters here have experienced; the feeling of knowing what is coming while also continuing 'normal' life.

But if 'our' knowledge was more widely understood, this despair aspect would drop away and be replaced with hope. Even if we couldn't ultimately succeed, we would be part of a heroic effort, and I think that is a common trait that could be awoken in most people.

As to how this could be done... I wonder how constrained reporters are by their rich media-mogul bosses?

This is a great discussion - and 5to10, you certainly woke me up just now (right before bed  ;D )

Arctic sea ice / Re: Arctic temperature layers and inversions
« on: February 23, 2017, 07:11:35 PM »
I am still working toward understanding this better myself. I believe what is being said is that as the lower level heats and reverses the initial inversion, then a positive feedback is started and the heat is radiated downward after that point, instead of cooling into space.

My reading of the paper is that the inversion is a positive factor in surface warming amplification. Therefore to my mind, once the inversion is lost the amplification could reduce.

As the paper says:

"The ability of the Arctic wintertime clear-sky atmosphere to cool to space decreases with inversion strength."

Of course there are many more than this single factor in Arctic warming amplification and clearly the ongoing (?) weakening of the inversion is not saving the Arctic so far. But my non-expert reading is that at least for this one specific feedback, increased warming might actually reduce the feedback as the inversion strength weakens.

I'd be curious to know the thoughts of you intelligent people on this.  :)

Arctic sea ice / Re: Arctic temperature layers and inversions
« on: February 19, 2017, 12:26:33 AM »
Well we are already experiencing the first consequences of the ground-level warming surely. The next question is how a lack of inversion would affect atmospheric dynamics. Note one of Aslan's earlier links ( which suggests the temperature inversion had an amplifying effect on warming - could that amplification be lost?

Even if so, I suppose it is replaced by warming from the increased atmospheric moisture content. But these are just idle musings (I have no knowledge but am trying to learn).

I am particularly interested in whether the loss of inversion itself (rather than just the temperature rise) would have effects on weather patterns locally and more widely in the winter..?

Thanks for this Aslan.

Arctic sea ice / Re: Stupid Questions :o
« on: February 18, 2017, 11:10:24 PM »
Thank you very much Crandles, much obliged! And thanks to Jim also. :)

Arctic sea ice / Re: Stupid Questions :o
« on: February 18, 2017, 05:22:56 PM »
Here is my stupid question:

DMI 80n graph page says the data is derived from the ECMWF operational model. I can see in the older graph years that ERA40 was used but I don't know what the "operational model" is now.

Basically I want to get the data behind the DMI 80N graph but am struggling to find out where to look. I'm not sure if the values calculated by DMI are available somewhere but cannot see anywhere to obtain from their site?

Thanks for any help :)

Arctic sea ice / Re: 2017 sea ice area and extent data
« on: February 16, 2017, 09:04:40 PM »
When I look at the DMI 80N since the beginning of 2016 I count 9 bricks.  The bottom temp simply has not been able to break through 247 in 9 tries.

Indeed DMI 80N has not dropped below the green line (in winter) since December 2015. :o

I can't see any year other than 2016 that has the property of being always above average in DMI 80N (well, there is also 2017 so far..). However I don't have the knowledge to make my speculation worth much if I was to start predicting next winter!

Arctic sea ice / Re: What the Buoys are telling
« on: February 14, 2017, 06:54:57 PM »
A hearty "welcome back" to OBuoy 14, and thank you to everyone for their interesting posts in this thread. I followed 14's journey through the melt season and was sad when it finally turned off.

Well done to the buoy for making it through, and to whoever was involved in constructing these buoys.  :)

Science / Re: Scientists scramble to safeguard data ahead of 'scrubbers'
« on: December 16, 2016, 05:13:51 PM »
Hopefully on-topic enough - certainly a good counter to the (justifiably, IMO) rather doom-laden original post:

Jerry Brown strikes defiant tone: ‘California will launch its own damn satellite’

Gov. Jerry Brown, rallying a room of scientists Wednesday with his most heated rhetoric yet on the topic, suggested California would defy the federal government should President-elect Donald Trump impede the state’s efforts to thwart climate change.
He said if the federal government “starts messing with” the state’s renowned science facilities, such as Lawrence Livermore National Laboratory, “I am the president of the Board of Regents. I am going to say, ‘Keep your hands off. That laboratory is going to pursue good science.’ ”

The speech is available on YouTube here (and is firey stuff):

[Thanks to Neven and all who contribute here for such an enlightening forum  :)]

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