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THE MERCURY (So. Africa) Climate change taking a toll on glaciers By Richard Ingham Paris - Scientists have issued a fresh warning about the effect of climate change on Antarctica, saying that more than 200 coastal glaciers are in retreat because of higher temperatures. Of the 244 marine glaciers that drain inland ice on the Antarctic peninsula, a region previously identified as vulnerable to global warming, 87 percent have fallen back over the last half century, according to research by British experts. Using 2 000 aerial photos dating back to the late 1940s and 100 satellite pictures, experts from the British Antarctic Survey (BAS) compiled a record of glacier-ice shelves and tidewater glaciers along the peninsula - the tongue of land that juts 800km northwards out of continental Antarctica. 'Since then this pattern has reversed' Glacier-ice shelves are floating glaciers on the shoreline that are still connected to the land glaciers from which they flowed. Tidewater glaciers rest on rock and break off into the ocean when they reach the water's edge. Over the last half century, during which time regional temperatures have risen by around 2°C, these glacier fronts have reversed direction, the authors note in a study published on Friday in the US weekly journal Science. Until the mid-1950s, most of the glaciers advanced. For the next decade after that, they were roughly stable. Since then, though, most have been shrinking. In the past five years, the retreat has accelerated, and the pattern of retreat is widening. It started in the warmer northern tip of the peninsula and is heading progressively to the colder south as atmospheric temperatures rise. "Fifty years ago, 62 percent of the glaciers that flowed down from the mountains to the sea we looked at were slowly growing in length, but since then this pattern has reversed," said lead author Alison Cook. The average retreat of the 212 shrinking glaciers has been 600m over 50 years. But this does not take into account a dramatic acceleration in recent years, exposing numerous islands that were once ice-smothered. "... "... "... "... FOR FULL ARTICLE: http://www.iol.co.za/index.php?set_id=14&click_id=143&art_id=qw1114060140529B253 _________________________ Peter Anderson, President RECYCLEWORLDS CONSULTING 4513 Vernon Blvd. Suite 15 Madison, WI 53705-4964 Ph: (608) 231-1100 Fax: (608) 233-0011 Cell: (608) 698-1314 eMail: anderson@no.address web: www.recycleworlds.net |
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