NSIDC Sea Ice Update: Largest June Ice Loss in Satellite Record

July 6, 2012

National Snow and Ice Data Center:

Arctic sea ice extent declined quickly in June, setting record daily lows for a brief period in the middle of the month. Strong ice loss in the Kara, Bering, and Beaufort seas, and Hudson and Baffin bays, led the overall retreat. Northern Hemisphere snow extent was unusually low in May and June, continuing a pattern of rapid spring snow melt seen in the past six years.

Overview of conditions
Arctic sea ice extent for June 2012 averaged 10.97 million square kilometers (4.24 million square miles). This was 1.18 million square kilometers (456,000 square miles) below the 1979 to 2000 average extent. The last three Junes (2010-2012) are the three lowest in the satellite record. June 2012 ice extent was 140,000 square kilometers (54,000 square miles) above the 2010 record low. Ice losses were notable in the Kara Sea, and in the Beaufort Sea, where a large polynya has formed. Retreat of ice in the Hudson and Baffin bays also contributed to the low June 2012 extent. The only area of the Arctic where sea ice extent is currently above average is along the eastern Greenland coast.

The ice extent recorded for 30 June 2012 of 9.59 million square kilometers (3.70 million square miles) would not normally be expected until July 21, based on 1979-2000 averages. This puts extent decline three weeks ahead of schedule.

Conditions in context
In June, the Arctic lost a total of 2.86 million square kilometers (1.10 million square miles) of ice. This is the largest June ice loss in the satellite record. Similar to May, the month was characterized by a period of especially rapid ice loss (discussed in the mid-month entry, June 19th) followed by a period of slower loss. Warm conditions prevailed over most of the Arctic; temperatures at the 925 hPa level (about 3000 feet above the ocean surface) were typically 1 to 4 degrees Celsius (1.8 to 7.2 degrees Fahrenheit) above the 1981 to 2010 average, and as much as 7 to 9 degrees Celsius (12.6 to 16.2 degrees Fahrenheit) above average over northern Eurasia and near southern Baffin Bay. Weather patterns over the Arctic Ocean varied substantially through the month.

June 2012 compared to recent years
Arctic sea ice extent for June 2012 was well below average for the month compared to the satellite record from 1979 to 2000. It was the second lowest in the satellite record, behind 2010. Through 2012, the linear rate of decline for June Arctic ice extent over the satellite record is 3.7% per decade.

A report from the field
Dr. Chris Polashenski of the Cold Regions Research Lab (CRREL) recently returned from making sea ice measurements on landfast ice a few kilometers offshore near Barrow, Alaska as part of the National Science Foundation and NASA funded Seasonal Ice Zone Observing Network (SIZONET) project. He and his fellow researchers made some interesting observations. Prior to the onset of melt, the ice was thicker than observed in recent years – around 1.8 meters (5.9 feet) as compared to typical conditions of around 1.4 meters (4.6 feet). Despite this thick ice at the beginning of the season, melt proceeded relatively rapidly. Melt ponds began forming on June 4—a typical timing for recent years, but high temperatures, sunny afternoons, and foggy nights combined to speed the melt of ice thereafter.

Figure 4. These photographs show sea ice on the fast ice near Barrow, Alaska. (a) Chris Polashenski stands in a melt pond with instrumentation, (b) honeycombed sample of rotten ice taken from the bottom of a melt pond, (c) sea ice rubble field after winds pushed the weakened sea ice onto the shore.
Credit: National Snow and Ice Data Center, courtesy Chris Polanshenski of CRREL as part of the SIZONET project.
High-resolution image

On June 17-18, a confluence of weather conditions, including a daytime high of 19 degrees Celsius (66 degrees Fahrenheit), overnight condensing fog, and bright sun in the afternoon combined to produce exceptional surface melt of just under 11 centimeters (4.3 inches) in a 24-hour period, according to preliminary lidar data. By June 18, ice conditions had deteriorated significantly and with strong winds forecast out of the west, safety dictated it was time to get off the ice. Collisions of the pack with the weakened shore fast ice on June 21-23 resulted in substantial deformation and a series of ice pushes onto the beach, an amazing process to watch from the safety of land.

Such field observations may only be representative of the local area. However, they provide context for basin-wide observations and a better understanding of local processes.

Below: In my 2010 Arctic Ice review, I featured a video clip from Dr. David Barber of the University of Manitoba, who gave the clearest description of his observations of the “rotten ice” that, in his observations characterized a significant of portion of the once-robust Beaufort Sea ice.

5 Responses to “NSIDC Sea Ice Update: Largest June Ice Loss in Satellite Record”

  1. rayduray Says:

    Neven’s Arctic Sea Ice Blog has more on PIOMAS ice volume. In brief, we are in record setting territory for low volume as well as low extent of arctic sea ice. Good thing we’ve got another pole, eh?

    http://neven1.typepad.com/blog/2012/07/piomas-july-2012.html


    • Ray, Thanks, I guess 🙂 The numbers in the PIOMAS report are indeed shocking.

      Meanwhile, WUWT readers are voting on the sea ice extent. Give his readers credit for their unwavering tenacious fight against established scientific theory and evidence…..

      “Why is everbody getting bent out of shape over summer sea ice extent? It does not matter what happens to the sea ice during summer. After the sun falls below the horizon in the fall, freeze-up occurs quite rapidly. By Dec when the ice is about 3 ft thick, the ice road trucking season can start and the nat gas and oil drilling operations can get underway.”

      “You realize if you win, you are endorsing the IPCC methodology of scientific consensus means accuracy.”

      http://bit.ly/M0ikPi

  2. mrsircharles Says:

    Well. “Steven Goddard” will make a “recovery out of that… probably in December…

  3. pjssjr Says:

    At WUWT they are voting on the minimum ice cover for 2012. Since democracy is good for every thing, it must also serve for climate modeling…

  4. otter17 Says:

    With ice that is getting continually thinner, it seems a heavy-loss year such as 2007 is more likely.


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