What Happens At the Poles: Lowest Arctic Sea Ice on Record

Photo: Polar Bear
No longer just for polar bear, melting Arctic sea ice has implications for us all. Photo: Wikimedia Commons

 

This year has seen the Arctic sea ice sheet melt further, and faster, than has ever been seen before in human history – a whopping 760,000 square kilometers less than ever recorded (which is 3.29 million square kilometers below the average minimum). Though images of polar bears and walrus stranded on melting ice-cubes pop up, and we morn the ever-increasing loss of their habitat; what happens at the poles will not stay at the poles. The affect of the Arctic sea ice diminishing will not just remain in the far north, we can (and should) expect more and more extreme weather as a result of this year’s ice loss.

 

Photo: Arctic Sea Ice 2012
Arctic sea ice extent for September 16, 2012 was 3.41 million square kilometers (1.32 million square miles). The orange line shows the 1979 to 2000 median extent for that day. The black cross indicates the geographic North Pole. From the National Sea Ice Data Center.

 

As the Arctic Ocean becomes more and more exposed with the loss of its ice-white blanket in the summer, more and more water will be evaporated into the atmosphere, creating increased humidity and stormy weather as it’s precipitated out. The ice cover in the north also reflects sunlight and heat, cooling the upper atmosphere and cooling the planet’s overall climate. In addition, as permafrost areas warm and melt, methane, a greenhouse gas usually trapped under a layer of ice, is released. As more methane is released into the atmosphere, the atmosphere will get warmer – creating a feedback loop that will warm the Arctic even faster than before.

 

The graph above shows Arctic sea ice extent as of September 17, 2012, along with daily ice extent data for 2007 and 2005, the previous record low years. 2012 is shown in blue and 2007 in green. The gray area around the average line shows the two standard deviation ranges of the data. From the National Sea Ice Data Center.

 

Warmer, wetter and stormier summers are likely in our future, but conversely winters may be colder than past years. The open Arctic Ocean could cause heat advection to be faster, changing the annual high and low pressures and weakening the input of warm air from the south through the winter months. More water in the atmosphere and a cooler winter climate could equal more snow and ice storms in the Northern Hemisphere, creating drastic extremes in annual temperatures.

Though there is no way to predict the exact weather patterns that will happen on a year by year basis, but we do know the trend is not looking good.  Hotter and colder, wetter and drier — what was once classed as “extreme” will become the norm everywhere around the globe. With more than a touch of sadness, it is with almost certainty I will see an open Arctic Ocean within my lifetime.

It’s more than time for us all to start paying attention to what is happening in the Polar Oceans.

 

Arctic Sea and Ice News, National Snow and Ice Data Center

Ice-Free Arctic Sea May be Years, Not Decades, Away” Richard Kerr, 28th Sept 2012, Science News

 

Changing Planet

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Dr. Rhian Waller is a professor of Marine Sciences at the Darling Marine Center (University of Maine, USA) and specializes in the ecology of deep-sea and cold-water organisms, particularly corals. Rhian has led or participated in over 40 international research and exploration cruises and expeditions to some of the most remote parts of the planet, and has published over 30 scientific papers and book chapters in her 9 year career. She is passionate about educating the next generation of scientists, and conserving our little known deep-sea and polar ecosystems to be studied and enjoyed in the future.