Arctic Sea-Ice Maximum

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“Arctic sea ice extent for February 2019 averaged 14.40 million square kilometers (5.56 million square miles). This was 900,000 square kilometers (347,000 square miles) below the 1981 to 2010 long-term average extent, and 450,000 square kilometers (174,000 square miles) above the record low for the month set in February 2018. For the Arctic as a whole, February 2019 tied with 2015 for the seventh lowest average February extent in the 1979 to 2019 satellite record.

“The daily average ice growth rate of 19,400 square kilometers (7,500 square miles) was near the long term average of 20,200 square kilometers (7,800 square miles). Ice growth during February primarily occurred in the Barents Sea and in the Sea of Okhotsk. Some ice growth was also observed in the Labrador Sea. Recent years have seen reduced ice coverage in the northern Barents Sea related to “Atlantification”—a greater influence of warm waters brought in from the Atlantic (see previous post). Sea ice extent toward the end of February 2019, however, was much closer to average in this region. By sharp contrast, sea ice extent drastically retreated in the Bering Sea in February and continues to as of this post.”


 

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“Arctic temperatures at the 925 hPa level (approximately 2500 feet above the surface) were from 4 to 10 degrees Celsius (7 to 18 degrees Fahrenheit) above the 1981 to 2010 average for a region extending from the Bering Sea, through the Beaufort Sea, and into the Canadian Arctic Archipelago (Figure above).

“This is consistent with a pattern for the month of low pressure at sea level centered over the western Bering Sea, and high pressure centered over northwestern Canada (Figure 4b). Low pressure dominated both the central Arctic Ocean and the northern North Atlantic. As such, it comes as no surprise that the Arctic Oscillation index was positive overall for the month.”

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