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Arctic ice meltdown continues with significantly reduced winter ice cover
September 14, 2006As far as temperatures drop in the Arctic winter - on average to -34°C (-29°F) - a new study shows that in the last two years sea ice is shrinking on the surface of Arctic waters to record low levels. Using satellite data, scientists have observed unusually warm wintertime temperatures in the region and a resulting decline in the length of the Arctic ice season.
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 ten percent per decade.
"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 from the Defense Meteorological Space Program's Special Scanning Microwave Radiometer and the National Oceanic and Atmospheric Administration's Advanced Very High Resolution Radiometer since 1979 for his 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 ten 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 two weeks longer per year annually due to summer sea ice decline. This means that the onset of freeze-up is happening later in the fall season. As a result, the ice cover in winter never gets as extensive as it would have been if the freeze-up had begun earlier. More than that, the ice reflects the sun's radiation much more efficiently than the ocean's surface. As a result, as the ice cover declines, the ocean's surface warms, causing in turn, further decline of the ice.
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. "Some of the richest fisheries are found in the region, in part because of sea ice. 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."
In addition to climate warming, other factors can contribute to the observed retreat of winter sea ice. Hard blowing winds can compact ice, causing it to contract, making it thicker, but covering a smaller area. Wind direction may blow ice toward warmer waters, causing it to melt. Other processes can also affect sea ice, by way of warmer oceans to the south spinning up cyclones that will introduce warmer temperatures than normal that melt ice.
"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.
NASA/Goddard Space Flight Center
Comiso used a computer simulation and satellite data from the Defense Meteorological Space Program's Special Scanning Microwave Radiometer and the National Oceanic and Atmospheric Administration's Advanced Very High Resolution Radiometer since 1979 for his 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 ten 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 two weeks longer per year annually due to summer sea ice decline. This means that the onset of freeze-up is happening later in the fall season. As a result, the ice cover in winter never gets as extensive as it would have been if the freeze-up had begun earlier. More than that, the ice reflects the sun's radiation much more efficiently than the ocean's surface. As a result, as the ice cover declines, the ocean's surface warms, causing in turn, further decline of the ice.
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. "Some of the richest fisheries are found in the region, in part because of sea ice. 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."
In addition to climate warming, other factors can contribute to the observed retreat of winter sea ice. Hard blowing winds can compact ice, causing it to contract, making it thicker, but covering a smaller area. Wind direction may blow ice toward warmer waters, causing it to melt. Other processes can also affect sea ice, by way of warmer oceans to the south spinning up cyclones that will introduce warmer temperatures than normal that melt ice.
"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.
NASA/Goddard Space Flight Center
Arctic Ice News and Current Arctic Ice Events RSSFor toy-like NASA robots in Arctic, ice research is child's play
Several snowmobiles navigated speedily over arctic ice and snow in Alaska's outback in late June. This scene might seem ordinary except that the recently unveiled snowmobiles are unmanned, autonomous, toy-size robots called SnoMotes - the first prototype network of their kind envisioned to rove treacherous areas of the Arctic and Antarctic capturing more accurate measurements that will help scientists better understand what is causing the well-documented melting of ice in those regions.
How will the Arctic sea ice cover develop this summer?
The ice cover in the Arctic Ocean at the end of summer 2008 will lie, with almost 100 per cent probability, below that of the year 2005 - the year with the second lowest sea ice extent ever measured.
CU-Boulder researchers forecast 3-in-5 chance of record low Arctic sea ice in 2008
New University of Colorado at Boulder calculations indicate the record low minimum extent of sea ice across the Arctic last September has a three-in-five chance of being shattered again in 2008 because of continued warming temperatures and a preponderance of younger, thinner ice.
Arctic Ice More Vulnerable to Sunny Weather, New Study Shows
The shrinking expanse of Arctic sea ice is increasingly vulnerable to summer sunshine, new research concludes.
Researchers say Arctic sea ice still at risk despite cold winter
Using the latest satellite observations, NASA researchers and others report that the Arctic is still on "thin ice" when it comes to the condition of sea ice cover in the region. A colder-than-average winter in some regions of the Arctic this year has yielded an increase in the area of new sea ice, while the older sea ice that lasts for several years has continued to decline.
UNH-NOAA ocean mapping expedition yields new insights into arctic depths
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Older Arctic sea ice replaced by young, thin ice, says CU-Boulder study
A new study by University of Colorado at Boulder researchers indicates older, multi-year sea ice in the Arctic is giving way to younger, thinner ice, making it more susceptible to record summer sea-ice lows like the one that occurred in 2007.
Icy calculations on a hot topic
University of Utah mathematicians have arrived at a new understanding of how salt-saturated ocean water flows through sea ice - a discovery that promises to improve forecasts of how global warming will affect polar icepacks.
Explorers to Use New Robotic Vehicles to Hunt for Life and Hydrothermal Vents on Arctic Seafloor
Scientists and engineers from the Woods Hole Oceanographic Institution (WHOI) have just completed a successful test of new robotic vehicles designed for use beneath the ice of the Arctic Ocean.
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