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Warming oceans threaten Antarctic glaciers
March 16, 2007Scientists have identified four Antarctic glaciers that pose a threat to future sea levels using satellite observations
Scientists have identified four Antarctic glaciers that pose a threat to future sea levels using satellite observations, according to a study published in the journal Science.
However, despite recent attention that has focused on the importance of the Greenland ice sheet, the research shows that its glaciers are changing too erratically to establish a trend with confidence. In contrast, four major glaciers in East and West Antarctica were shown to be retreating in unison, raising concerns that global sea level could rapidly rise if the oceans continue to warm.
Dr. Andrew Shepherd, at the University of Edinburgh's School of GeoSciences, said: "Our assessment confirms that just one type of glacier in Antarctica is retreating today - those that are seated in deep submarine basins and flow directly into the oceans. These glaciers are vulnerable to small changes in ocean temperature, such as those that have occurred over the 20th century, and those predicted for the 21st century. A rise of less than 0.5 °C could have triggered the present imbalance."
Professor Duncan Wingham, at University College London, insists that the success of the research lies in the satellite instrumentation from which it is derived: "The extreme precision with which we can now make measurements of the Earth's surface allows us to see the increasingly subtle changes within the ice sheets that will govern their future sea level contribution."
University of Edinburgh
First evidence of under-ice volcanic eruption in Antarctica
The first evidence of a volcanic eruption from beneath Antarctica's most rapidly changing ice sheet is reported this week in the journal Nature Geosciences. The volcano on the West Antarctic Ice Sheet erupted 2000 years ago (325BC) and remains active.
Glaciers not on simple, upward trend of melting
Two of Greenland's largest glaciers shrank dramatically and dumped twice as much ice into the sea during a period of less than a year between 2004 and 2005. And then, less than two years later, they returned to near their previous rates of discharge.
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A Twin Otter Flies over Calley Glacier on the Antarctic Peninsula Framed Art Poster Print by Gordon Wiltsie, 18x22 by Art.com Art.com is the world's largest retailer of art prints, posters, photographs, and framed artwork. With our huge selection of over 400,000 prints, you'll easily find the perfect piece for your home, office, or classroom. Our art is printed on quality paper. When you order framed artwork, the piece is built by our team of in-house professionals. Visit our Amazon store today at www.amazon.com/artdotcom to find Special Offers and search for products based on 'Artist Name' and 'Subject Categories' such as Movie, Music, Vintage, TV, Children, Travel, Kitchen, Museum Art, Animals, Floral, Motivational, and Sports. Art.com is dedicated to providing you with high quality products and service by offering you 100% satisfaction guaranteed. We ship internationally to over 80 countries. Decorate your... |
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![Application of ^2^5^2Cf-PDMS to characterize airborne particles deposited in an Antarctic glacier [An article from: Science of the Total Environment, The]](http://ecx.images-amazon.com/images/I/51C6TCVNX8L._SL160_.jpg) |
Application of ^2^5^2Cf-PDMS to characterize airborne particles deposited in an Antarctic glacier [An article from: Science of the Total Environment, The] by K. Dias da Cunha (Author), H. Evangelista (Author), K. Dalia (Author), Simoes (Author) This digital document is a journal article from Science of the Total Environment, The, published by Elsevier in 2004. The article is delivered in HTML format and is available in your Amazon.com Media Library immediately after purchase. You can view it with any web browser. Description: The aim of this study is to apply the ^2^5^2Cf-PDMS (plasma desorption mass spectrometry) technique to characterize particles deposited in ice samples. This technique allows identification of molecular ions, even large molecules, desorbed from the sample surface, in contrast with PIXE (particle induced X-ray emission) or EDS (energy dispersive spectrometry). Two shallow snow cores obtained from different glacial drainage basins on King George Island ice cap, South Shetland Islands (Antarctica),... |
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