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Global environmental challenges

January 23rd, 2009

Cracking views of Antarctic icebergs

Posted by: Alister Doyle

As a view out of your home it’s hard to match — a constantly changing vista of icebergs just outside the British Antarctic Survey’s Rothera research station.

Every day the winds and tides on the Antarctic Peninsula shift them around — some break up  abruptly with a loud splash while many simply slowly grind into ice cubes against the shore and disappear. I’ve tried to take a picture every day from the main balcony here (there’s a metal mast on the right hand side of each photo).

Walking along the shore here you can hear a bubbling as air in the ice melts out into the water. The old ice is the clearest — good for putting in cold drinks. Some form gravity-defying shapes such as arches or big holes — one in the bay a few days ago looked like a giant catamaran.

Icebergs cracking off glaciers in the distance can sound like an artillery shell exploding and big lumps falling into the sea send a wave across the bay. Seals lie on the beach, some of them snoring or nonchalantly scratching themselves — completely unbothered by the people passing by.

 

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August 25th, 2008

A view from the North - Alaska’s melting glaciers

Posted by: Chris Baltimore

exitsign1.jpg Welcome to the front lines of global warming in the United States - the Harding Ice Field in Alaska, the biggest icefield in the United States.
   At the Exit Glacier north of Seward - the only glacier in the Kenai Fjords National Park reachable by foot - the giant cerulean blue ice sheet gives every sign of staying put.
   But one only has to glance at the many signs along the roadway and footpath to the glacier’s edge to mark its retreat  - it hit its peak size in 1815 and has been receding ever since. Signs along a footpath leading to the base of the glacier show just how far it has retreated.
   The glacier lost about 10 feet from its front face over the summer of 2008.
   Since the 1980s, land-based glaciers and ice caps like this one in Alaska have contributed the most to sea level rise than any other source within their category, which includes other land-based glaciers like Tanzania’s Mount Kilimanjaro and the Chacaltaya Glacier near La Paz, Bolivia, said Brenda Ekwurzel, a climate expert with the Union of Concerned Scientists.ailikcrash11.jpg
   Unlike the ice cover around the North Pole or giant floating ice sheets, land-based ice contributes directly to sea-level rises.
   According to a 2007 report by the U.N.’s Intergovernmental Panel on Climate Change, glaciers and ice caps have the potential to raise global sea levels by between .15 meters and .37 meters.
   That pales in comparison to the giant ice sheets in Greenland and Antarctica, which could raise sea levels by 63.9 meters if they fully melted.
   At the Aialik Glacier in the Harding Icefield - reachable by boat or plane, the living nature of the ice was more evident.
   On a visit to the glacier via tourboat on Aug. 15 on a trip hosted by the Knight Center for Environmental Journalism, several chunks of ice broke apart and crashed into Aialik Bay.
   glacier7.jpgThroughout the visit, the ice cracked and groaned, with a sound like thunder claps that punctuated the still air.

June 23rd, 2008

Skating on thin ice

Posted by: Alister Doyle

We hear a lot of grim news about how sea ice has been melting more than usual in recent summers in the Arctic, how glaciers from the Himalayas to the Andes are melting or how winter sports such as ice hockey in Canada may be under threat from global warming.

So here’s a bit of light relief (assuming it’s not for real):