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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. Please note that this is not an announcement of the sea ice minimum extent for 2012. NSIDC will release numbers for the 2012 daily minimum extent when it occurs. A full analysis of the melt season will be published in early October, once monthly data are available for September. Overview of conditions. Arctic sea ice extent for August 26, 2012 (right) was 4.10 million square kilometers (1.58 million square miles), which was 70,000 square kilometers (27,000 square miles) below the September 18, 2007 daily extent of 4.17 million square kilometers (1.61 million square miles, left).
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The orange line shows the 1979 to 2000 median extent for that day. The black cross indicates the geographic North Pole. Credit: National Snow and Ice Data Center High-resolution images:, Arctic sea ice extent fell to 4.10 million square kilometers (1.58 million square miles) on August 26, 2012. This was 70,000 square kilometers (27,000 square miles) below the September 18, 2007 daily extent of 4.17 million square kilometers (1.61 million square miles).
Including this year, the six lowest ice extents in the satellite record have occurred in the last six years (2007 to 2012). Conditions in context. The graph above shows Arctic sea ice extent as of August 26, 2012, along with daily ice extent data for 2007, the previous record low year, and 1980, the record high year. 2012 is shown in blue, 2007 in green, and 1980 in orange.
The 1979 to 2000 average is in dark gray. The gray area around this average line shows the two standard deviation range of the data.
The 1981 to 2010 average is in sky blue. Credit: National Snow and Ice Data Center After tracking near 2007 levels through July, the extent declined rapidly in early August. Since then, the loss rate has slowed some, averaging about 75,000 square kilometers (29,000 square miles) per day—equivalent to the size of the state of South Carolina. However, this is still much faster than the normal rate at this time of year of about 40,000 square kilometers per day (15,000 square miles). Note that the date and extent of the 2007 minimum have changed since we originally posted in 2007; see our for more information. Posted in Tagged.
Arctic sea ice extent during the first two weeks of August continued to track below 2007 record low daily ice extents. As of August 13, ice extent was already among the four lowest summer minimum extents in the satellite record, with about five weeks still remaining in the melt season. Sea ice extent dropped rapidly between August 4 and August 8. While this drop coincided with an intense storm over the central Arctic Ocean, it is unclear if the storm prompted the rapid ice loss. Overall, weather patterns in the Arctic Ocean through the summer of 2012 have been a mixed bag, with no consistent pattern. Overview of conditions. Arctic sea ice extent for August 13, 2012 was 5.09 million square kilometers (1.97 million square miles), 483,000 square kilometers (186,000 square miles) below the same day in 2007.
The orange line shows the 1979 to 2000 median extent for that day. The black cross indicates the geographic North Pole.
Credit: National Snow and Ice Data Center Arctic sea ice extent on August 13 was 5.09 million square kilometers (1.97 million square miles). This is 2.69 million square kilometers (1.04 million square miles) below the 1979 to 2000 average extent for the date, and is 483,000 square kilometers (186,000 square miles) below the previous record low for the date, which occurred in 2007.
( Note: The sea ice extent originally published on August 14, 2012 was the actual one-day value for August 13. We normally report the five-day trailing mean, so to be consistent we have updated the post with these numbers instead of the one-day value. See the for more information about the five-day trailing mean.) Low extent for the Arctic as a whole is driven by extensive open water on the Atlantic side of the Arctic, the Beaufort Sea, and—due to rapid ice loss over the past two weeks—the East Siberian Sea. Ice is near its normal (1979 to 2000) extent only off the northeastern Greenland coast. Ice near the coast in eastern Siberia continues to block sections of the Northern Sea Route. The western entrance to the Northwest Passage via McClure Strait remains blocked.