(NASA) -- The Arctic winter wonderland, known for its icy waterways and white snowy scenery, is experiencing record low sea ice in the last two years. In a new NASA study, scientists have used satellite observations to observe unusually warm wintertime temperatures in the region and a resulting decline in the length of the Arctic ice season.
 Image above:: Summer ice is not the only Arctic ice that has retreated in recent years. In 2005 and 2006, the winter ice maximum was about 6% smaller than the average amount over the past 26 years. This retreat is larger than the long-term 1.5 to 2% decrease in winter ice per decade. This visualization shows the winter sea ice cover during its annual maximum extent from 1979 to 2006, with the edge of the yellow area representing the farthest south reached by the winter ice cover since 1979. Click on image to view animation. Credit: NASA The maximum amount of sea ice in the Arctic winter has fallen by six percent over each of the last two winters, as compared to a loss of merely 1.5 percent per decade on average annually since the earliest satellite monitoring in 1979. This is happening as summer sea ice continues its retreat at an average of 10 percent per decade.  Image left: In this image, the whole of the sea surface is made of forming sea ice. Credit: NASA"This amount of Arctic sea ice reduction the past two consecutive winters has not taken place before during the 27 years satellite data has been available," said Joey Comiso, a research scientist at NASA's Goddard Space Flight Center, Greenbelt, Md. "In the past, sea ice reduction in winter was significantly lower per decade compared to summer sea ice retreat. What's remarkable is that we've witnessed sea ice reduction at six percent per year over just the last two winters, most likely a result of warming due to greenhouse gases." Comiso used a computer simulation and satellite data to carry out the study, to be published in Geophysical Research Letters this month. Computer simulations of the climate warming effect of greenhouse gases had predicted that winter sea ice would decline faster than summer sea ice. Satellite data has shown otherwise until two years ago, when record low winter ice cover and warmer temperatures have prevailed. Sea ice cover in the Northern Hemisphere spans nearly 10 million square miles in the winter. Satellite sensors are the only means to observe such a large region effectively. Comiso confirmed the accuracy of satellite sea ice data by comparing it with high-resolution satellite information and data gathered from sensitive instruments aboard aircraft. Surface temperature data from satellite sensors are checked against measurements from meteorological stations in the region. Adding to the plight of winter sea ice, previous research has shown a trend in which the melt period lasts about 2 weeks longer per year annually due to summer sea ice decline. According to Comiso, if the winter ice retreat continues, the effect could be very profound, especially for marine animals. "The seasonal ice regions in the Arctic are among the most biologically productive regions in the world," he said. "For example, sea ice provides melt-water in spring that floats because of low density. This melt-water layer is considered by biologists as the ideal layer for phytoplankton growth because it does not sink, and there is plenty of sunlight reaching it to enable photosynthesis. Plankton are at the bottom of the food web. If their concentration goes down, animals at all tropics level would be deprived of a basic source of food." "A continued reduction of the Arctic winter ice cover would be a clear indicator of the warming effect of increasing greenhouse gases in the atmosphere. It would at least confirm our current understanding of the physics of the Arctic climate system that has been incorporated in our models," said Comiso.var fstr = ''; if(hasFlash(5)) { fstr+=' '; } else { fstr+='This image requires Macromedia Flash to view. Please install the latest version of Flash Player and try again.'; } with(document) { open('text/html'); write(fstr); close(); | |
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