Christmas is coming, and Santa’s secret summer swimming pool has frozen over once again. However the same can’t be said for the Chukchi Sea! More on that in due course, but first let’s take a look at the PIOMAS volume graph at the end of November, courtesy of the wondrous Wipneus on the Arctic Sea Ice Forum:
2017 is currently third lowest, behind 2012 and 2016. Next let’s take a look at Wipneus’ PIOMAS Arctic sea ice thickness map:
followed by the University of Bremen’s SMOS Arctic sea ice thickness map:
Note the large area of pale blue open ocean still visible in the Chukchi Sea towards the top left of both maps.
For another perspective on Arctic sea ice thickness here’s the latest Cryosat-2 map, which currently is based on the month up to November 24th:
Finally, for the moment at least, here’s our very own Arctic Freezing Degree Days graph based on the DMI’s >80N data:
2017 is currently occupying the wide open space between the astonishingly low numbers last year and all previous years in DMI’s record. Here’s their graph for 2017 so far:
[Edit – December 10th]
Current Arctic sea ice area and extent derived from the University of Hamburg’s high resolution AMSR2 data:
Plus the latest update on the Chukchi Sea situation:
Before we got on to the more usual Arctic metrics let’s bear in mind that the beginning of May is the time when the ice on the mighty Mackenzie River begins to break up, ultimately sending a surge of (comparatively!) warm water rushing into the Beaufort Sea. The patches of open water visible in the Beaufort Sea off the Mackenzie Delta in early April refroze, but have recently opened up once again:
NASA Worldview “true-color” image of the Beaufort Sea on May 2nd 2017, derived from the MODIS sensor on the Terra satellite
Meanwhile Northern Hemisphere snow cover is falling fast, albeit still above last year’s levels:
Here’s the current view of the Liard River in northern Canada, with the Mackenzie River running bottom to top on the right hand side:
NASA Worldview “true-color” image of the Liard and Mackenzie Rivers on May 2nd 2017, derived from the MODIS sensor on the Terra satellite
The break-up of the Liard leads the Mackenzie, and taking a look at last year’s view of the same area it’s apparent that this year there’s somewhat more snow on the ground, and that this years Mackenzie break-up will therefore be a few days later than last year:
NASA Worldview “true-color” image of the Liard and Mackenzie Rivers on May 2nd 2016, derived from the MODIS sensor on the Aqua satellite
Whilst early melt in the Beaufort Sea is currently behind last year, the reverse is most certainly the case next door in the Chukchi Sea. The skies are rather cloudy there at the moment, but using the Suomi NPP day/night band to peer through the gloom reveals this:
NASA Worldview “day/night band” image of the Chukchi Sea on May 2nd 2017, derived from the VIIRS sensor on the Suomi satellite
Whilst sea coverage on the Pacific periphery has continued to fall, extent on the Atlantic side has not been following suit. Hence overall Arctic sea ice area is no longer lowest in the satellite record:
Finally, until the new PIOMAS numbers are released at least, here’s how DMI freezing degree days look at the moment:
[Edit – May 4th]
The April PIOMAS numbers have been published: Arctic sea ice volume is yet again by far the lowest on record:
[Edit – May 5th]
Greenland ice sheet surface melt has started early this year:
[Edit – May 12th]
The ice break-up of the Mackenzie River is now visible as increased flow at the junction with Arctic Red River just south of the delta:
Mackenzie River flow at Arctic Red River up to May 12th 2017
Meanwhile the sea ice in the Lincoln Sea north the Nares Strait is coming apart at the seams:
NASA Worldview “true-color” image of the Lincoln Sea on May 12th 2017, derived from the MODIS sensor on the Terra satellite
[Edit – May 17th]
May seems to be shaping up as month of two halves, both spatially and temporally. Here’s an overview of the current state of play:
On the Pacific side of the Arctic sea ice area has been declining rapidly courtesy of the expanding areas of open water visible in the Beaufort, Chukchi and East Siberian Seas. It’s currently tracking below other recent years:
However over on the Atlantic side area has been flatlining, and is currently above other recent years:
Ice mass balance buoy 2017A is now located near the boundary between the Beaufort and Chukchi Seas and as the melting season in that vicinity rapidly approaches it reveals that thermodynamic thickening has thus far achieved a mere 119 cm:
Arctic wide sea ice area has recently started to decline at an increasing rate:
During the second half of the month it will be interesting to see whether the forecast high temperatures produce significant melt ponding. If so it’s conceivable that 2017 area could drop below 2016 again by the beginning of June. There already signs of surface melt at places as far apart as Franklin Bay, Chaunskaya Bay and even the Great Bear Lake!
Watch this space!
References
Muhammad, P., Duguay, C., and Kang, K.-K.: Monitoring ice break-up on the Mackenzie River using MODIS data, The Cryosphere, 10, 569-584, doi:10.5194/tc-10-569-2016, 2016.
Rood S. B., Kaluthota S., Philipsen L. J., Rood N. J., and Zanewich K. P. (2017) Increasing discharge from the Mackenzie River system to the Arctic Ocean, Hydrol. Process., 31, 150–160. doi: 10.1002/hyp.10986.
Kwok, R., L. Toudal Pedersen, P. Gudmandsen, and S. S. Pang (2010), Large sea ice outflow into the Nares Strait in 2007, Geophys. Res. Lett., 37, L03502, doi:10.1029/2009GL041872.
It looks like a storm is brewing in the Arctic. The long range weather forecasts for the Arctic have been remarkably unreliable recently, but this one is for a mere three days from now. WaveWatch III suggests there will be some significant waves in the Chukchi and Beaufort Seas this coming weekend, travelling in the direction of the ice edge:
WaveWatch III wave height forecast for July 17thWaveWatch III wave period forecast for July 17thWaveWatch III wind forecast for July 17th
Another day has dawned, and the Environment Canada synoptic chart shows that the low pressure system currently over the Arctic has reached a central pressure of 990 hPa:
The latest ECMWF SLP forecast for tomorrow is firming up:
A modest swell is now visible from USCGC Healy’s “AloftCon” webcam:
whilst the WaveWatch III forecast for tomorrow has dropped off to a significant wave height of around 2 metres with an average period of 7 seconds:
Meanwhile an image from the VIIRS instrument on the Suomi NPP satellite reveals the current storm in all its glory, together with confirmation that the “Big Block” multi-year ice floe north of Barrow has split asunder overnight:
[Edit July 17th 2016]
Sunday morning has now arrived. The storm in the Arctic looks to have bottomed out at 986 hPa central pressure. Here’s the Environment Canada synoptic chart for 00:00 this morning:
This is how the resultant swell looked from USCGC Healy at 06:00:
[Edit July 18th 2016]
Here’s what the Beaufort and Chukchi Sea north of Barrow look like this morning through the clouds:
NASA Worldview “true-color” image of the Beaufort Sea on July 18th 2016, derived from the MODIS sensor on the Terra satellite
The remains of the now not so “Big Block” can just be made out in the bottom left. For a cloud free image here’s the latest AMSR2 passive microwave imagery of the area from the University of Hamburg:
The USCGC Healy and the remnants of the swell are in amongst the ice:
[Edit July 20th 2016]
As the remnants of the storm head off across the Canadian Arctic Archipelago here is what it has left in its wake in the Central Arctic Basin:
NASA Worldview “false-color” image of the Central Arctic Basin on July 19th 2016, derived from the MODIS sensor on the Aqua satelliteUniversity of Hamburg AMSR2 concentration visualisation of the Central Arctic on July 19th 2016
[Edit July 21st 2016]
The storm has dispersed the remaining ice in the Beaufort Sea over the last few days:
However across the Arctic as a whole sea ice area continues its downward trend:
June has arrived, and according to the Great White Con Arctic sea ice calendar that means the summer surface melting season has started. Once July arrives bottom melt should have started in earnest too, but for now let’s stick to the surface. Here’s the Climate Reanalyzer map of Arctic surface air temperatures at 06:00 UTC this morning:
Green areas are above 0 degrees Celsius, and bear in mind that the melting point of sea ice is at around -1.8 degrees Celsius. The red areas near the East Siberian Sea coast are 25-30 degrees Celsius. Given those sort of temperatures you might well think that some snow and/or ice in that area would be melting, and you would be correct! Here is the Japan Aerospace Exploration Agency’s current map of Arctic surface melting:
The assorted shades of blue/grey show the areas where surface melting is already underway. Whilst this melting is taking place you may possibly read in some quarters of the cryodenialosphere that “There is almost no melting going on in the Arctic“. The authors of such nonsense evidently don’t know their proverbial Arctic arse from their elbow.
Here’s how today’s surface melting in the East Siberian Sea looks from space:
NASA Worldview “false-color” image of the East Siberian Sea on June 4th 2016, derived from the MODIS sensor on the Terra satellite
Meanwhile over on the other side of the Arctic, here’s yesterday’s surface melting on “Amundsen’s Route” through the Northwest Passage:
NASA Worldview “false-color” image of the Northwest Passage on June 3rd 2016, derived from the MODIS sensor on the Aqua satellite
By way of further illustration of the fact that Arctic sea ice is and has been melting, here is a graph of the current area of sea ice in the all important central area of the Arctic Basin, courtesy of “Wipneus” at Arctische Pinguin:
The areas included are the Central Arctic Basin, plus the Beaufort, Chukchi, East Siberian and Laptev Seas. The above zero temperatures are forecast to spread across the Central Arctic Basin early next week, whereupon it will be very interesting to discover what happens to the snow around the single ice mass balance buoy currently transmitting near real time data. Here is the current temperature profile for the sea ice underneath IMB buoy 2015F:
The current conditions there are summarised this morning as:
Pos: 82.00 N, 147.45 W
Air Temp: -3.74 C
Air Pres: 1007.42 mb
Snow depth: 21 cm
Ice thickness: 202 cm
Normally by now there would also be a number of webcams beaming back pictures from across the sea ice in the Arctic Basin. However according to NOAA:
Due to funding constraints, it was not possible to deploy new Web Cams in Spring 2016, but deployments in Spring 2017 are planned.
Three of the camera carrying O-Buoys also seem to have failed over the winter, which leaves us with only O-Buoy 14 to reveal the forthcoming melt to us:
O-Buoy 14 image from June 2nd 2016
O-Buoy 14 is currently colocated with Ice Tethered Profiler 89, the yellow object in the foreground, at 77.49° N, 153.92° W, to the north of the Beaufort Sea. ITP 89 measures the temperature and salinity of the water beneath the sea ice and revealed this the last time it managed to take a measurement, a month or so ago:
If you examine the extreme right hand edge of the charts carefully you will no doubt note that the water underneath the ice has recently become both warmer and saltier.
Watch this space!
[Edit – June 5th 2016]
The latest JAXA/ADS map shows that the area of sea ice undergoing surface melting has increased since yesterday, particularly over the Chukchi Sea:
The recent clouds over the Beaufort Sea cleared yesterday. Here’s a close up view of the open water between the big floes from the Suomi satellite:
According to the US National Snow and Ice Data Center, the Beaufort Gyre is:
A clockwise circulation (looking from above the North Pole) in the Beaufort Sea, north of Alaska. This circulation results from an average high-pressure system that spawns winds over the region.
Such a high pressure system has been in place over the Arctic Ocean for a few days now, and the effect of the clockwise circulation on the sea ice in the Beaufort Sea is already evident in these recent satellite images:
NASA Worldview “true-color” image of the Beaufort Sea on April 9th 2016, derived from the MODIS sensor on the Terra satelliteNASA Worldview “false-color” image of the Beaufort Sea on April 12th 2016, derived from the MODIS sensor on the Terra satellite
as well as in this animation of sea ice movement since February:
The high pressure is forecast to continue for several more days. Here’s the GFS forecast for April 20th, courtesy of MeteoCiel:
Northern Hemisphere surface pressure forecast for April 20th 2016
which shows a large system with a central pressure of 1040 hPa still sitting over the Northern Beaufort Sea. Next here’s an animation from the US Navy which forecasts ice thickness until April 19th:
April 13th 2016 ACNFS Beaufort Sea thickness forecast until April 19th
Note in particular the large area of open water forecast to be produced in the Chukchi sea off Barrow, Alaska by the end of the period. The continuing clockwise winds have already started reducing the area of sea ice in the Beaufort Sea at an unusually early date:
Amongst other things we’ll be keeping a close eye on the ice area in the Chukchi Sea over the next few days. The sun is already starting to bathe that area of our planet with its rays, and open ocean soaks up that heat much more readily than bright white ice.
[Edit – 16/04/2016]
Here’s an animation of the effect on sea ice of the Beaufort Gyre in overdrive from Neven at the Arctic Sea Ice Blog:
Notice how towards the end of the animation another huge part of the ice pack, north of the Canadian Arctic Archipelago is pulled into the Gyre. This is mostly multi-year ice.
Arctic sea ice extent has been anomalously low this winter. The greatest anomalies are in the European sector, specifically in the Barents Sea. To what extent are the anomalies associated with warm temperatures?
Which she answered as follows:
So, what might be causing this particular anomaly? Some possibilities are:
Gobal warming (January 2016 was warmest Jan on record, according to the surface temperature analyses
Multidecadal oscillations (e.g. stadium wave) predicts ice recovery to be occurring in the same region (European Arctic) where we see the sea ice decline).
Seasonal weather circulation patterns – this has been a year with with unusual weather patterns, with both low temperature and high temperature records being set.
As regular readers will already be aware we have been blogging about anomalously warm temperatures in the Arctic all year and so felt well qualified to contribute to the “debate”. What a job that turned out to be! Early on in the proceedings the anticipated pronouncement was made by one of Judith’s “denizens”. A link to a ludicrously inaccurate article on Watts Up With That accompanied by the following words of wisdom:
Other measures are high.
Which of course they aren’t! Instead of stating the bleedin’ obvious Professor Curry replied:
I spotted this, no idea what to make of it.
You would think she and her denizens would therefore have been pleased when I attempted to explain to her what to make of it, but you would have been mistaken. The icing on the ad hominem cake was the aforementioned Anthony Watts driving by to accuse me of all sorts of nefarious activities without providing a single shred of evidence and then running for the hills when invited to actually prove his ludicrous allegations.
Since the denizens of “Climate Etc.” aren’t particularly interested let’s take stock here instead shall we? After every Arctic area and extent metric under the sun sitting at “lowest *ever” levels for weeks a recent increase in coverage on the Pacific side of the Arctic has changed that. The most up to date example of that is the JAXA/ADS extent, which currently looks like this:
The latest reading is the merest whisker above 2015’s record low maximum. However in other respects things are most certainly not comparable with 2015. See for example this concentration comparison from Andrew Slater of the NSIDC:
Much more ice on the Pacific periphery where it will all have disappeared by September, as opposed to much less ice on the Atlantic side, even well to the north of 80 degrees latitude where the sun still does not shine. Here’s a video revealing how the sea ice North of the Pacific Ocean has been reacting to the sequence of hurricane force storms that have been passing through the area over the past couple of months:
Now let’s take a look at “near real time” Arctic sea ice thickness as measured by the CryoSat 2 satellite:
Notice the absence of any thick ice in the Beaufort and Chukchi Seas, an obvious difference from last year? Notice too the large area of thick ice that looks as though it’s heading towards the Fram strait exit from the Central Arctic. Here’s another video, this time of sea ice movement over on the Atlantic side of the Arctic Ocean:
Those dark areas between Svalbard and the North Pole are suddenly starting to look as though they represent reality rather than a mere “artifact”, although perhaps they are merely transient evidence of yet another Arctic “heat wave”?
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