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Dear John, please accept todays' first English lesson: It's called cleavage, if your are referring to that pretty young woman in the video. It's called a crevasse, if you are on a glacier. On Arctic sea ice, we call it leads. Leads may lead anywhere, but they hardly help getting rid of multi-year ice at this time of year.
AbbottisGone, it "Melted From the Bottom, now it's gone!" See also: As you will see in the video (around 0:20 ), there is plenty of snow up there, so it must be darn cold. Hence, it can only be bottom melt at this time of the year...
That would be something like this: Remaining Arctic Sea Ice (by the end of summer) Average........Cubic Km (x 1,000) 1980s...........15 1990s...........13 2000s............9 2010-2015......5 201?............<1 Source: PIOMAS – University of Washington
Toggle Commented Sep 21, 2015 on Minimum and MYI at Arctic Sea Ice
Sorry, forgot to include the 1000. Remaining Arctic Sea Ice (by the end of summer) Average........Cubic Km (x 1,000) 1980s...........15 1990s...........13 2000s............9 2010-2014......5 2015.............? ????...............0 Source: PIOMAS – University of Washington
Toggle Commented Sep 21, 2015 on Minimum and MYI at Arctic Sea Ice
EDSV, Appreciate your attempt at simplifying the messages. Still a bit to go though, when it comes length. I would do it like this: Remaining Arctic Sea Ice (by the end of summer) Average Cubic Km 1980s...........15 1990s...........13 2000s............9 2010-2014......5 2015.............? ????...............0 Source: PIOMAS – University of Washington Cheers P
Toggle Commented Sep 21, 2015 on Minimum and MYI at Arctic Sea Ice
Susan & D, sitting in Paris under a considerable column of "precipitable water" is one thing. Looking at the 300 knots jetstream at 250 hPa ( see,55.35,1068 ) makes you wonder what is more important these days. During last nights twisters and rainstorms, three people were killed in France.
Toggle Commented Sep 17, 2015 on PIOMAS September 2015 at Arctic Sea Ice
John, "hilarious" may not be the right word here. I would rather call it a tragedy, that by the time these ice-breakers will come afloat, the ice may have gone, and they will be better suited for ploughing through the dead bodies in the Mediterranean - see ...
Neven, we are never too old to learn. Here is a quick and dirty translation (no attempt at rhyming): A small low in Beaufort got all attention this year, ’cause strong winds blew swells towards the coast. On their way, they broke remaining floes, as if they were just fragile cakes. Now Barrow is battered, and I’m anxious/excited.
Toggle Commented Aug 28, 2015 on Arm's race (and a storm) at Arctic Sea Ice
Neven, thanks! Again you have done a splendid job summarizing this precarious situation. This morning on the train to work, I couldn't help write a little poem about it (in Danish unfortunately): Et lille lavtryk Beaufort fik al opmærksomhed i år fordi der blæst’ en vældig vind og dønninger på kysten ind. På vejen knak de sidste flager som var de sprøde kager. Nu Banker Barrow blot i brændingen, Mens jeg tydeligt mærker spændingen.
Toggle Commented Aug 28, 2015 on Arm's race (and a storm) at Arctic Sea Ice
Espen, at the moment I see 183 more or less meaningless contributions to that thread in Ingeniøren. I am as disappointed as you are, that this story has not been picked up by any news media in our country. On the other hand, when I see how the Washington Post treated this story, I came to think of a new term: journalistic reticence.
Toggle Commented Aug 23, 2015 on Jakobshavn record retreat at Arctic Sea Ice
Hi Espen, because Neven says that this blog is for news and the forum is for discussion. Details of Substage 5e some 125 thousand years ago on a remote tropical island can hardly be called news these days... Cheers P
Toggle Commented Aug 23, 2015 on Jakobshavn record retreat at Arctic Sea Ice
Marcel, I just got through the Hansen et al. draft, and I am pretty sure they did not consider the ice fall mechanism. During my reading of the manuscript, I discovered that you had overlooked the contribution from one retrograde glacier basin in Antarctica. Apparently the Cook glacier may over time contribute about half of the SLR of the Totten glacier (possibly 0.5 m in your numbers). Hansen et al. also reminded me that continental droughts may soon contribute a few decimeters to the overall SLR picture, which brings the overall total closer to 13 m. However, when I started to dig into the underlying references, they suddenly opened up a can of worms. On several lines of evidence, I do not concur with the authors. When it comes to the “chevron ridges and wave run-up deposits on Bahamas” (Hearty et al. (1998), I respectfully have to disagree. The interpretation of these morphological units is utter nonsense. Nowhere are these aeolian parabolic features made by waves, and the (apparently wave washed) 2000 t boulders are not even described in the paper. This thread is however not the right place for a discussion like that, so I will eventually have to move the discussion to this thread:,1327.0.html in due course.
Toggle Commented Aug 23, 2015 on Jakobshavn record retreat at Arctic Sea Ice
Tor, You are absolutely right. The white "spots" in the lakes are remnants of last year's lake ice. So, it is not the lake bed you are seeing, but the signature of a perennial lake on the ice sheet surface indicating either a large depression or a slow glacier under neath.
Toggle Commented Aug 22, 2015 on Lakes on a glacier at Arctic Sea Ice
Even Danish media have now picked up this story: see: About 15 cm down, there is a link to this thread. Lookout for the keyword "Jakobshavn" and please ignore the discussion (mainly in Danish).
Toggle Commented Aug 21, 2015 on Jakobshavn record retreat at Arctic Sea Ice
Chris Mooning I think you are kidding… James Balog’s 2009 TED-talk video here: shows around minute 16:00 some time lapse footage of the ice fall in the background. I recall having seen even more dramatic and more recent time lapse photos of the ice fall on the northern shore of the Southern Branch. If someone could just point me to such footage off the beaten track, that would extremely helpful.
Toggle Commented Aug 21, 2015 on Jakobshavn record retreat at Arctic Sea Ice
Marcel_g Sorry to have confused you with a well-known fracking formation in the US underground. Again, I largely concur with your reflections on the Rignot et al. papers over the years. I have myself been over that same exercise of adding numbers from snow cover sublimation, sea ice melt, shelf-ice disintegration, ice-stream calving, mountain glaciers melting, permafrost thawing etc. It is a lot of fun doing the maths, but not really applicable in a public context. Maybe Rignot et al. tried to see the disintegration as a 2-dimensional problem. In reality – as shown by the recent disintegration of the Southern Branch of the Jakobshavn Isbræ – there are actually 4 dimensions to the problem: 1) Retreat of the calving front due to warmer oceans 2) Lowering of the ice-stream surface due to this retreat 3) Ice fall from surrounding plateaux due to less buttressing 4) Global sea level rise over time due to 1-3 above. Please remember that there is always a grounding line available somewhere under the ice-sheet. I still reckon, that since both Dansgaard-Oescher- and Heinrich events happened in the Northern Hemisphere concurrently, we have to combine all our knowledge about catastrophic palaeo-events with the most recent observations from the most likely source of natural variability. Disregarding for a moment your timing estimates, I came up with following cumulative SLR: GrIS............4.5 m GrIs Add........2.0 m WAIS------------4.2 m Totten..........1.0 m Mountain Gl. ..0.3 m Ocean warm....0.3 m Total.........-.12.3 m It's not that far off my initial estimate of 14 m. What the heck, I consider this a rounding error of no practical importance on the time scales we consider here.
Toggle Commented Aug 21, 2015 on Jakobshavn record retreat at Arctic Sea Ice
Marcellus, wellcome to the blog. I trust you are one of those "true glaciologists" advertised for. I generally concur with your reasoning. My main point was that Greenland melt would have to come first in order to lift up the WAIS. I must admit, that I have not yet finished reading the Hansen et al. draft, so I honestly don't know, whether they have included this ice-fall mechanism or not. Nevertheless, it is good to have you onboard. Please provide reflections and observations at your convenience. Cheers P
Toggle Commented Aug 20, 2015 on Jakobshavn record retreat at Arctic Sea Ice
Kris, Previous footage from the Jakobshavn calving front retreat were quite scary. In the old days, the ice stream carried Inland Ice from the centre of Greenland (now colloquially called the “Southern Branch”) towards the coast, which helped to keep the ice level high near the coast. After the initial retreat of the ice front some years ago, it was quite obvious that a new “Ice-Fall” developed on the northern shore of the newly developed “Southern Ice-fjord”. It is ridiculous to discuss the detailed forth and back of the current calving front of the Southern ice-stream on a daily, weekly or even monthly basis. Fact is that year to year changes since the incursion of Atlantic warm salty waters across the sill at the entrance of the Jakobshavn Ice-fjord has gone only one way: DOWN. Looking ahead some few years, we may foresee a retreat of the calving front Eastwards some 40 km from the current setting. This will open up 2x40 km’s of ice-falls on the northern and southern side of the Southern Branch. I am fully aware that Ice-streams have one kind of flow properties. However, Ice-falls are a completely different kettle-of-fish. Ice-falls may actually be compared with solid precipitation, since examples show that ice falls do not need physical connection to carry on moving massive amounts of glacier ice downhill from a plateau to a fjord. Getting the new landscape details correct is essential. Getting the true glaciologist onboard is even more important. My bet is that the Greenland Ice-sheet will provide the first 7m of sea level rise through the ice-fall mechanism. Later on , we should expect to see the West Antarctic contribute another 7m of sea level rise due to essentially the same Ice-fall mechanism.
Toggle Commented Aug 19, 2015 on Jakobshavn record retreat at Arctic Sea Ice
More wood on the fire: New Japanese study is out (abstract only): Using a high resolution (60 km grid) global model, observed SSTs and a robust SST ensemble for the future under an A1B scenario, they find that enhanced advection of moisture to the Arctic is going to increase even further. It says in the abstract, that: “The increases in PAVE, SDII, and R5d can be partly attributed to an increase in water vapor associated with increasing temperatures, and to an increase in the horizontal transport of water vapor from low to high latitudes associated with transient eddies.” As is clear by now, the early autumns (Aug-Oct) in the Arctic will be warmer and warmer and if the tropics at the same time get colder and colder due to more intense tropical cyclones, we may soon see the equable climate conditions unfold.
Toggle Commented Aug 16, 2015 on A wetter and warmer Arctic at Arctic Sea Ice
Neven, Please avoid the "Like"-button. This is not a vote forum or a beauty contest. It is a deadly serious matter for the whole world. Having Cincinattus around for a short while was thought-provoking, which is good in my mind. Please avoid the scape-goat'ism, which has been sticking out it's grim face in this thread for a while. It is really bad taste to continue ridiculing a guy, whos has been "banned for life" on this site.
Toggle Commented Aug 6, 2015 on PIOMAS August 2015 at Arctic Sea Ice
Well spoken Sam On the other hand, this move may give the World a new and strong focal point to oppose. One should have thought that Shell had learned something from the Brent Spar affair... Cheers P
Toggle Commented May 14, 2015 on Bill McKibben nails it at Arctic Sea Ice apparently a source of many delusions...
Toggle Commented Apr 3, 2015 on The Ns are calling the maximum at Arctic Sea Ice
Cincinnatus & navegante Inspired by your negative reactions and your harsh references to the “Arkham Asylum for the Criminally Insane”, I decided to follow your leads and look at both the Eocene Epoch and the concept of “Living Fossils”. What I found was this: Living fossils are quite unique in this world. Several definitions appear, but I liked this one in particular: “A living fossil is an organism that has retained the same form over millions of years, has few or no living relatives, and represents a sole surviving lineage from an epoch long past. Many living fossils alive today have bizarre, eccentric traits that make them seem more like aliens than anything from this world. They have often survived several mass extinctions, and many scientists consider them to be a rare glimpse at how life on Earth was long ago. “ A few examples are: From Botany: Japanese Umbrella Pine ( see ) and it’s Eocene amber producing relative: Chinese water fir – also known as Dawn redwood (see is particularly fond of wet environments Gingko Biloba ( , which is a living fossil favoring disturbed river side environments Various forms of laurels (see ) often found in moist locations in isolated stands (also known as Laurel forests From zoology: The Okapi (see ) is a rare species living in the tropical rainforests in the Democratic Republic of Congo The Platypus (see ) is a SE Australian minority species living in just three watershed in the riverbanks The Quensland Lungfish ( see ) is yet another species surviving drought and flooding in its own special way Critters and below: Finally, Stromatolites are found in coastal marine environments in NW Australia ( see ). Apparently this particular subspecies has survived on earth for about 3.5 billion years building solid calcium carbonate structures during times of trouble. New species also appear from time to time: Birdie Namkheng (see,416.msg8891.html#msg8891 ) So, in order to sum up: All these living fossils seem to have survived both the Eocene and the Eemian. They nearly all favor moist climates and they seem to prefer nocturnal activities. They also seem well fitted to exploit all the new opportunities of a near-future equable climate. I was just wondering, whether there would be any similarities between contributors to the ASIB and those “Living Fossils”. Apparently we have all survived in small pockets of existence, we become active during the night, we are generally very old, and – despite spreading our seeds worldwide – our ofsspring seldom takes our civilization to a higher level. May I propose to change the name of the ASIB to: “Asylum of the Living Fossils”
Toggle Commented Apr 3, 2015 on The Ns are calling the maximum at Arctic Sea Ice
Gents & ladies Some have asked about the Barents retreat this year. Is it part of the new pattern? It may be, and I will try to explain why. Oct-Apr The Bering Sea remains open due to a hot North Pacific Nov-Feb Nares and Fram straits remain open – shifting loads of the remaining multi-year sea ice southwards Dec-Mar Extra-tropical cyclones feed on the temperature contrast between ice and Gulf Stream waters in the NW Atlantic and cyclones move persistently towards the Barents Sea - transporting warm and moist air towards the eastern Arctic hemisphere Jan-Mar Snow accumulates in the Arctic – 500-1000 km3 more than in previous years Feb-Apr Arctic sea ice maximum extent fluctuates around a new winter minimum despite total darkness in the Arctic Ocean Mar-May Sublimation of snow catches on despite sub-zero (degC) temperatures all over the Arctic land and ocean areas Apr-Jun Snow starts to melt from the south - eats away the protective snow cover - and forms melt ponds on the flat, young Arctic sea ice May-Jun Early season persistent Arctic cyclones breaks up the fragile Arctic sea ice and stirs the temperature stratification in peripheral seas Jun-Aug Peak insolation melts isolated ice floes and heat up waters in the Central Arctic Ocean, as well as thawing permafrost over the continents Jul-Sep Tropical cyclones delivers dry and warm air high in the atmosphere, which adds to the melting of the Greenland Ice sheet Aug-Oct The temperature contrast between the Arctic and the Tropics is so low that only one (extended) Hadley Cell can exist Sep-Nov Late season persistent Arctic cyclones detoriates remaining ice floes and breaks up late season halocline in the Central Arctic Ocean Oct-Apr Marginal seas may see some sporadic sea ice formation, but the Central Arctic will remain open It may take more than one year to get through this shift to a new seasonal cycle, but open it will be…
Toggle Commented Mar 30, 2015 on The Ns are calling the maximum at Arctic Sea Ice
We have now passed the minimum and some important players have passed a sharp corner. Today, it was announced that the World's largest toy producer has decided to end commercial activities with Shell -mainly after a public (6 million people signed up!) manifestation. Read the full story here: