The Biggest Story You Aren’t Seeing on the News. Sea Ice in Free Fall.

August 27, 2012

Hurricane Isaac vs the Republicans is rising on the charts – but its really a footnote compared to the big story. How long before the major media turn cameras on the jaw-dropping drama that’s had scientists transfixed for the last 3 weeks?

Arctic Sea Ice Blog:

I apologize for having provided so little analysis lately, but things are moving so fast that analysis can’t keep up. Now I know what an IPCC regional model for the Arctic must feel like. 😉

Basically, I’m at a loss for words, and not just because my jaw has dropped and won’t go back up as long as I’m looking at the graphs. I’m also at a loss – and I have already said it a couple of times this year – because I just don’t know what to expect any longer. I had a very steep learning curve in the past two years. We all did. But it feels as if everything I’ve learned has become obsolete. As if you’ve learned to play the guitar a bit in two years’ time, and then all of a sudden have to play a xylophone. Will trend lines go even lower, or will the remaining ice pack with its edges so close to the North Pole start to freeze up?


UPDATE 27 AUGUST: Sunday’s data confirms that the previous sea-ice extent minimum of 24 September 2007 was broken last Friday, 24 August 2012. What is also stunning are sea-ice daily extent figures averaging ice loss of more than 100,000 square kilometres per day for the last four days. This suggest melt is accelerating very late in the melt season in a pattern that has never before been observed. The Arctic this year is heading into new territory and it looks like 2012 may in retrospect be seen as the year when a new melt regime took hold.
The ice extent is about to drop below 4 million square kilometres for the first time in the satellite record, and the Arctic has shed almost half a million square kilometres of sea-ice in last five days! With three weeks of the melt season still to go, it’s not hard to see extent dropping another half a million square kilometres (or more!) to 3.5 million square kilometres. (In previous big melt years of 2007 and 2011, around half a million square kilometres was lost after 26 August.)
This is starting to make the second graph (below) looking reasonable, and those scientists and models which have been suggesting an sea-ice-free summer Arctic within a decade to be on the money.

Climate change impacts are frequently happening more quickly and at lower levels of global warming than scientists expected, even a decade or two ago. And this week the Arctic has provided a dramatic and deeply disturbing example.
According to IARC/JAXA satellite data at Arctic Sea-ice Monitor from the Japan Aerospace Exploration Agency, the sea-ice extent of 24 August 2012 of 4,209,219 square kilometres broke the previous record in the satellite era of 4,254,531 square kilometres set on 24 August 2007. Back then the were scientific gasps that the sea ice was melting “100 years ahead of schedule”.

What is astounding is that the record has been broken with three to four weeks of the melt season to go, and that the rate of melting this month is unprecedented in the modern record. Check the chart above (click to enlarge), with the red line mapping 2012 sea-ice extent. The slope of the line is much steeper than in previous years for August.
Looking at the data, the daily rate of sea-ice loss for 1-24 August has been 99,029 square kilometres per day in 2012, compared to:

  • 2007   62,976 square kilometres per day
  • 2008   72,785 square kilometres per day
  • 2009   53,859 square kilometres per day
  • 2010   55,109 square kilometres per day
  • 2011   63,342 square kilometres per day
  • 2012   99,029 square kilometres per day

And last three days have been 119,219, 128,281 and 122,188 square kilometres per day (they use 2-day running average, so last figure subject to revision).
It is remarkable that rate of loss is so much greater than previous years this late in the melt season, and at present shows no sign of easing.
The ice is now much thinner on average than in the past, as the extent of multi-year icedeclines sharply. Thin ice is easily smashed up by storms and rough seas, and that’s what’s happened this year. In early August, a huge, long-lived Arctic ocean storm decimated the sea ice area which was melting out at a record rate, before the high waves and winds shattered the Siberian side of the ice cap.  But there have been subsequent, less well-reported, cyclonic storms churning up the ice, which may explain why the melt rate has not eased off in the last 10 days.
What the minimum extent will be this year is anybody’s guess. It depends on weather conditions over the next three weeks, and how much ice is now just above the threshold (of 15 per cent sea-ice in a given area) and is currently counted as sea-ice, but likely to be below the threshold by the third week of September.
Even if the ice loss over the next 3-4 weeks was similar in magnitude to previous recent years, the season low could be around 3.5 million square kilometres. Maybe a good bit more, perhaps somewhat less. We will have to wait and see.
The next chart, amended, from NSIDC shows the 2007 fourth IPCC report projections for Arctic sea ice (blue line) and projections for RCP4.5 (representative concentration pathways) (red line) being used for the forthcoming fifth IPCC report in 2014. Actual observations are in black, and I have taken the liberty of sketching in grey what it will look like if the 2012 figure is around 3.5 million square kilometres.

While you may not yet get why the disappearance of arctic ice is a big deal for you, wherever you live, this video from last spring does a nice job of explaining our best emergent understanding of the consequences of open water in the arctic.

15 Responses to “The Biggest Story You Aren’t Seeing on the News. Sea Ice in Free Fall.”

  1. The ice has been thinning, there was a big storm, the trend is clear but wow. Every day for the last week or so I have been expecting that line (IJIS extent) to start flattening out. But it is still so steep.

    I have no idea what to expect. Although I think we can stop calling 2007 an extreme outlier now. Is an extent of 3 million sq Km possible? A week ago I would have said not.

    Another story not getting much press is the Bayou Corne sinkhole. Yes there have been sinkholes before, but within about a kilometer of nearly a million barrels of butane stored in a salt dome and with Isaac due hit the area in a few days. It is not the dome that the butane is in that is suspect, but it looks like someone put something they should not have in the suspect dome,

    • jasonpettitt Says:

      Indeed. Thinning is the real story. Extent is the Arctic Ocean’s last hurrah. There’s nothing but the vagaries of weather between now and a future ice free Arctic.

      The graphs have not been updated just yet, but (future corrections aside – which could go either way) it looks like today is the day NSIDC smashes past 2007. It’s not even September yet, and there’s no sign of the melt starting to slow down.

  2. The Arctic was likely free of Ice 5000 years ago. So what’s the big deal? We’re heading back to good old days!…or probably not….

    • jasonpettitt Says:

      I know you jest, but semi-seriously there was probably some low ice conditions in the early Holocene (9000 years ago when people still lived in caves) – but it’s not clear that even then the Arctic was ice free – it’s possible that there was so much ice before the Holocene Climactic Optimum that the melt might not have got much past Greenland.

      But more importantly – the Holocene Climate Optimum was orbital in nature. We are currently suborbital. Which ever way it’s comparing apples with oranges.

  3. Peter Mizla Says:

    The arctic was not ice free 5,000 years ago- it was not as warm in 3000BCE as today- even at the warmest part of the Holocene (up to 2000ad)- 10,000 years ago the arctic was not ice free. We are now at the warmest part of the Holocene.

    the last time the arctic was ice fee for most of they summer was likely in the Pliocene- 3.75 million years ago. Going back even further- it was ice free 9 months out of the year in the Miocene, 15 million years ago.

  4. Peter Mizla Says:

    This extreme decline this year puts in motion the probability of the arctic sea ice being gone (80% or more) before 2020. Obviously the American Public remains totally uniformed what this means to them and their future. This is serious business- but Americans and their vaunted ‘exceptionalism’ feel no danger.

  5. “The Biggest Story You Aren’t Seeing on the News. Sea Ice in Free Fall.”

    Awe come on, be fair, a Lion may have been spotted in the English countryside…. a far more important story!

    “Lion hunt in Essex is serious, say police

    Police deploy helicopters with heat-seeking equipment, armed officers and zoo staff with tranquilliser guns in search for lion”

    Sea ice being lost at 99,029 square kilometres per day…… or a Lion in Essex!

    • jasonpettitt Says:

      As an Essex boy, I can tell you that the Lion in Essex is actually pretty exciting. Not least because, given that it’s St Osyth, you can’t rule out that it’s an extra-terrestrial shape-shifting being visiting from Tau Ceti.

  6. I was just saying that its likely that there are “some” in the blogoshpere that wont be convinced 😉

    The Viking Card will be used.

    ..even when the melting right now upthere is happening in front of their face – or under their feet.

  7. junkdrawer88 Says:

    In the land of 24 hr summer sun, large portions of the Arctic Ocean are now Ice-free for months at a time. Those same portions, instead of reflecting sunlight back to space, are now heating up to 14C (57F).

    Add to that, open waters are increasing the number and severity of storms over the Arctic which, in turn, are stirring up the warm saline layers.

    Oh, and did I mention that methane is now leaking from the Arctic? Might be the dreaded methane clathrates, might be anaerobic bacteria – no one is sure.

    So we have exponentials feeding exponentials feeding exponentials. And we’re surprised by runaway melting. Really?

    • Actually, ‘dismay’ is probably more appropriate than ‘surprise’.

      Sometimes predicting catastrophe has a grim, “I told you so” sort of satisfaction. Sometimes. It is usually accompanied by a “Why don’t you listen to me?!?!” attitude.

      In this case, there is no satisfaction.

      It’s just grim.

      Larry Oliver
      a/k/a @tweetingdonal

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