Klimaatverandering 31

De Times bericht: 'Antarctic Air is Warming Faster Than Rest of World. New finding could have implications for sea level rises.
AIR temperatures above the entire frozen continent of Antarctica have risen three times faster than the rest of the world during the past 30 years. While it is well established that temperatures are increasing rapidly in the Antarctic Peninsula, the land tongue that protrudes towards South America, the trend has been harder to confirm over the continent as a whole. Now analysis of weather balloon data by scientists at the British Antarctic Survey (BAS) has shown that not only are the lower reaches of the Antarctic atmosphere warming, but that they are doing so at the fastest rate observed anywhere on Earth.
Temperatures in the troposphere — the lowest 8km (5 miles) of the atmosphere — have increased by between 0.5C and 0.7 C (0.9F and 1.3F) per decade over the past 30 years. This signature of climate change is three times stronger than the average observed around the world, suggesting that global warming is having an uneven impact and that it could be greater for Antarctica. It is already known that temperatures in the Arctic are rising steeply, but with the exception of the Antarctic peninsula, the data for the southern ice-cap are more mixed. Although the Antarctic peninsula has warmed by more than 2.5C during the past 50 years, most surface measurements suggest that there have been no pronounced temperature changes elsewhere on the continent, while some have indicated a small cooling effect. The new research, led by John Turner, of the BAS, shows that the air above the surface of Antarctica is definitely warming, in ways that are not predicted by climate models and that cannot yet be explained. The results are published today in the journal Science.
“The rapid surface warming of the Antarctic Peninsula and the enhanced global warming signal over the whole continent shows the complexity of climate change,” Dr Turner said.
“Greenhouses gases could be having a bigger impact in Antarctica than across the rest of the world and we don’t understand why.' Lees verder:
http://www.timesonline.co.uk/article/0,,3-2111772,00.html Of: http://www.commondreams.org/headlines06/0331-05.htm