2016 Arctic sea ice wintertime extent hits another record low

2016 Arctic sea ice wintertime extent hits another record low
Arctic sea ice was at a record low wintertime maximum extent for the second straight year. At 5.607 million square miles, it is the lowest maximum extent in the satellite record, and 431,000 square miles below the 1981 to 2010 average maximum extent. Credit: NASA Goddard's Scientific Visualization Studio/C. Starr

Arctic sea ice appears to have reached a record low wintertime maximum extent for the second year in a row, according to scientists at the NASA-supported National Snow and Ice Data Center (NSIDC) and NASA.

Every year, the cap of frozen seawater floating on top of the Arctic Ocean and its neighboring seas melts during the spring and summer and grows back in the fall and winter months, reaching its maximum yearly extent between February and April. On March 24, Arctic sea ice extent peaked at 5.607 million square miles (14.52 million square kilometers), a new record low winter maximum extent in the satellite record that started in 1979. It is slightly smaller than the previous record low maximum extent of 5.612 million square miles (14.54 million square kilometers) that occurred last year. The 13 smallest maximum extents on the satellite record have happened in the last 13 years.

The new record low follows record high temperatures in December, January and February around the globe and in the Arctic. The atmospheric warmth probably contributed to this lowest maximum extent, with air temperatures up to 10 degrees Fahrenheit above average at the edges of the ice pack where sea ice is thin, said Walt Meier, a sea ice scientist at NASA's Goddard Space Flight Center in Greenbelt, Maryland.

This short animation shows the Arctic sea ice freeze cycle from the last summertime minimum extent to March 24, when it reached its wintertime maximum extent. Credit: NASA Goddard's Scientific Visualization Studio/C. Starr

The wind patterns in the Arctic during January and February were also unfavorable to ice growth because they brought warm air from the south and prevented expansion of the ice cover. But ultimately, what will likely play a bigger role in the future trend of Arctic maximum extents is warming ocean waters, Meier said.

"It is likely that we're going to keep seeing smaller wintertime maximums in the future because in addition to a warmer atmosphere, the ocean has also warmed up. That warmer ocean will not let the ice edge expand as far south as it used to," Meier said. "Although the maximum reach of the sea ice can vary a lot each year depending on winter weather conditions, we're seeing a significant downward trend, and that's ultimately related to the warming atmosphere and oceans." Since 1979, that trend has led to a loss of 620,000 square miles of winter sea ice cover, an area more than twice the size of Texas.

This year's record low sea ice maximum extent will not necessarily result in a subsequent record low summertime minimum extent, Meier said. Summer weather conditions have a larger impact than the extent of the winter maximum in the outcome of each year's melt season; warm temperatures and summer storms make the ice melt fast, while if a summer is cool, the melt slows down.

Arctic sea ice plays an important role in maintaining Earth's temperature—its bright white surface reflects solar energy that the ocean would otherwise absorb. But this effect is more relevant in the summer, when the sun is high in the sky in the Arctic, than in the winter, when the sun doesn't rise for months within the Arctic Circle. In the winter, the impact of missing sea ice is mostly felt in the atmosphere, said Jennifer Francis, a climate scientist at Rutgers University in New Brunswick, New Jersey.

"In places where sea ice has been lost, those areas of open water will put more heat into the atmosphere because the air is much colder than unfrozen sea water," Francis said. "As winter sea ice disappears, areas of unusually warm air temperatures in the Arctic will expand. These are also areas of increased evaporation, and the resulting water vapor will contribute to increased cloudiness, which in winter, further warms the surface."

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Mar 29, 2016
BartV: Interesting quote. Where did you get it from since it is not from the article? Or did you just make it up?

Mar 29, 2016
Duplicate again

Mar 29, 2016
Even if the article did include a line somewhat like that... imagine you have a weighted die. It prefers to roll 6s, say. After some set of rolls, there are 10% more 6s than other numbers, say. Now are any one of those 6s *caused* by the weight? Surely without the weight, you'd still occasionally roll a 6. Which of the rolls are the 10% additional "caused" by the weighting?

That's why the argument about 'cause' behind any specific phenomenon gets distorted. Scientists who are speaking properly about the conclusions they can draw know that they can't say any one event is *caused* by AGW. But the pattern of all the same kinds of events (record breaking temps year after year, record ice lows year after year, storm intensity and frequency, etc.) really do indicate a "weighted die"

Mar 29, 2016
And the Arctic Ice Death Spiral continues.

Mar 29, 2016
Don't you love some people's logic and predictions:

Since we exist in a world where this comment also exists - I'm going to go with no.

Nowhere in this article do they say anything that is not consistent with this being a result of global warming. The specifically say it's due to atmospheric warmth.

Once again, I am befuddled, confounded, amused and fascinated by the fact that climate change denial seems to stop people being able to read.

Apr 01, 2016
Duplicate again

Congratulations thermomoron. Twice, can be excused as a mistake, three times just confirms your stupidity.

Apr 09, 2016
And the Arctic Ice Death Spiral continues.

And here is the latest version showing a large drop since last year:

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