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***Changed embargo time***Rising sea levels could be 'cancelled out' by increased snowfall
May 17, 2005A paper published today in Science shows that the largest ice sheet in the world, the East Antarctic Ice Sheet, is growing due to increased snow fall. This growth partly mitigates the sea level rise caused by melting glaciers in other areas, especially Greenland.
The study, conducted by scientists from the Desert Research Institute and Universities of Missouri and Arizona in the USA, and Dr Edward Hanna at the University of Sheffield in the UK, used satellite measurements to assess the thickness of ice over an eleven year period, from 1992-2003. At the same time, they also used weather forecast models and ice core data to study trends in snowfall during the same period.
"This thickening correlated very well with the snowfall modelling, showing that the increased snowfall is causing the ice sheet to grow in mass. We estimate that the ice sheet is holding an extra 45 billion tonnes of water each year, the equivalent of a sea level drop of 0.12mm a year.
"At the same time, the thinning of the Greenland ice sheet is contributing to a sea level rise of 0.2mm a year. This is being offset to some extent by the sea level drop caused by the thickening of the East Antarctic Ice Sheet.
"Global warming may mean a moister atmosphere and therefore a wetter climate that increases snowfall on the East Antarctic Ice Sheet. However, natural climate variations cannot be ruled out without having more years of data.
"Although the thickening of the East Antarctic Ice Sheet is lessening the effects of the sea level rise caused by other melting ice sheets, it's important to remember that this effect doesn't completely balance out rising sea levels, which will still have a significant impact on the planet."
Sheffield, University of
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