Antarctica

The PIG is flying

by Gareth August 18, 2009

The Pine Island Glacier in West Antarctica is thinning four times faster than 10 years ago, a new study(*) of satellite measurements shows. Since 1994, the central portion of the glacier has thinned by as much as 90 metres, and the ice surface is currently lowering by 16 metres a year. At this rate of [...]

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Thin ice #2

by Gareth July 8, 2009

New analysis of Icesat data by a NASA team headed by Ron Kwok shows that from 2004 to 2008 Arctic winter sea ice “thinned dramatically”. Icesat measures the “freeboard” of the sea ice, the amount above water level. The graph below shows the extent of the decline, which is most marked in multi-year ice (ice [...]

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Southern freeze

by Gareth June 12, 2009

While we’re on the subject of ice, Australia’s Antarctic Climate & Ecosystem Cooperative Research Centre today launched two new publications: Polar ice sheets and climate change: global impacts [PDF], and Changes to Antarctic sea ice: impacts [PDF]. Described as “position analyses”, the papers provide an excellent overview of the current state of our understanding of [...]

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Quirk, strangeness, not much charm

by Gareth May 6, 2009

Another day, another angry diatribe from Air Con author Ian Wishart — longer and more intemperate that his last, but I’m getting used to the style. It seems he believes that attack is the best form of defence, which is great if you’ve got the ammunition (like the Crusaders backs of recent seasons, if not [...]

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Cracking up

by Gareth April 22, 2009

With the “pin” to Charcot Island gone, big cracks that first formed in 2008 are are opening up in the Wilkins ice shelf, and a new break up is taking place close to Latady Island. The animation above uses ESA “webcam from space” images captured on April 18 and 21 (the latter has black corners). [...]

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An ice reminder

by Bryan Walker April 22, 2009

A brief reminder that Extreme Ice, which was previewed on Hot Topic a few days ago, shows at 9.30 tonight on Sky’s National Geographic channel and a couple more times in subsequent hours.

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A coral room

by Gareth April 18, 2009

Sea level rise is usually considered to be a relatively slow process, at least in human terms. Even a one metre rise over the next century (well within the bounds of possibility) is “only” one cm a year. It seems like a small number, even if when those small numbers start accumulating they bring big [...]

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Extreme Ice

by Bryan Walker April 15, 2009

“It’s a strange, evil, gorgeous, horrible, fantastic place,” calls out photojournalist James Balog as he abseils a short way down into a deep hole in the Greenland ice opened up by surface meltwater rushing down perhaps to bedrock hundreds of metres somewhere below. It’s understandable Balog should have mixed feelings.  The view is stunning. But [...]

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Breakaway

by Gareth April 9, 2009

This somewhat crude(*), but effective animation of the two most recent ESA images of the Wilkins Ice Shelf break up shows clearly that with the “pin” gone, large areas of ice are beginning to move. The most recent image (April 8th) is the smaller, overlaid on one captured on April 5th. Focus on what was [...]

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Gone west

by Gareth April 8, 2009

NASA’s Earth Observatory has just published a pair of beautiful images of the Wilkins Ice Shelf showing the ice bridge before and after collapse. The image above, acquired on April 6th, shows the bergs created by the break up moving towards the west. With the bridge gone, the remnant ice from earlier break ups to [...]

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