Sea Ice Today
Analyses
Sea ice extent retreated fairly rapidly through the first two weeks of July as a high pressure cell moved into the central Arctic, bringing warmer temperatures over much of the Arctic Ocean.
Arctic sea ice continues to track below average but remains well above the levels seen last year. The relatively slow ice loss is a reflection of the prevailing temperature and wind patterns.
Arctic sea ice extent declined at a near-average rate through May, but overall it remained below average compared to the 1979 to 2000 average. The Arctic Oscillation (AO) varied through the month between modest positive and negative phases.
Arctic sea ice extent declined at an approximately average rate through April. While the Arctic Oscillation was in its negative phase for most of winter, in mid April it turned positive.
Arctic sea ice has passed its annual maximum extent and is beginning its seasonal decline through the spring and summer. While total extent was not at record low, it remained well below average through March.
On March 15, 2013, Arctic sea ice extent appears to have reached its annual maximum extent, marking the beginning of the sea ice melt season. This year’s maximum extent was the sixth lowest in the satellite record.
Arctic sea ice is nearing its winter maximum and will soon begin its seasonal decline.
Arctic sea ice extent for January 2013 was well below average, largely due to extensive open water in the Barents Sea and near Svalbard. The Arctic Oscillation also remained in a primarily negative phase.
Arctic sea ice extent for December 2012 remained far below average, driven by anomalously low ice conditions in the Kara, Barents, and Labrador seas.
For the Arctic as a whole, ice growth for November was faster than average. However, the Kara and Barents seas remained largely ice free, contributing to above-average air temperatures in these regions.
Autumn over the Arctic Ocean is a season of falling temperatures and rapid growth of sea ice.
The sun has set over the central Arctic Ocean and sea ice extent is now increasing.
On September 16, Arctic sea ice appeared to have reached its minimum extent for the year of 3.41 million square kilometers (1.32 million square miles).
On September 17, Arctic sea ice extent was 3.41 million square kilometers. Within the next couple of days, we expect to announce that the minimum extent has been reached for the year.
Arctic sea ice appears to have broken the 2007 record daily extent and is now the lowest in the satellite era. With two to three more weeks left in the melt season, sea ice continues to track below 2007 daily extents.
Arctic sea ice extent during the first two weeks of August continued to track below 2007 record low daily ice extents.
Arctic sea ice extent declined quickly in July, continuing the pattern seen in June. On August 1, ice extent was just below levels recorded for the same date in 2007, the year that saw the record minimum ice extent in September.