EXTREME MELTING OF GREENLAND CAN SELF-AMPLIFY

The Greenland icesheet can experience extreme melting even when temperatures do not hit record highs, according to a new analysis by Dr. Marco Tedesco, assistant professor in the Department of Earth and Atmospheric Sciences at The City College of New York. His findings suggest that glaciers can undergo a self-amplifying cycle of melting and warming that would be hard to stop.

'We are finding that even if you don't have record-breaking highs, as long as warm temperatures persist you can get record-breaking melting because of positive feedback mechanisms,' said Professor Tedesco, who directs CCNY's Cryospheric Processes Laboratory and also serves on CUNY Graduate Centre doctoral faculty.

Full report on ScienceDaily.

STILL A BIG OZONE HOLE OVER SOUTH POLE

The Antarctic ozone hole, which yawns wide every Southern Hemisphere spring, reached its annual peak on September 12, stretching 26.03 million square kilometres (10.05 million square miles), the ninth largest on record. Above the South Pole, the ozone hole reached its deepest point of the season on October 9 when total ozone readings dropped to 102 Dobson units, tied for the 10th lowest in the 26-year record, reports ScienceDaily.

NEW STUDY GAZUMPS CLIMATE-CHANGE SCEPTICS

Global warming is real says a major study released on October the 20th. Despite issues raised by climate-change sCeptics, the Berkeley Earth Surface Temperature study found reliable evidence of a rise in the average global land temperature of approximately 1°C since the mid-1950s, reports ScienceDaily.

Click here for more data from the Berkley Earth study.

SEA WILL RISE FOR 500 YEARS?

Researchers from the Niels Bohr Institute are part of a team that has calculated the long-term outlook for rising sea-levels in relation to the emission of greenhouse gases and pollution of the atmosphere using climate models, reports ScienceDaily.

In the pessimistic scenario, emissions keep increasing, and the sea rises 1.1 metres by the year 2100 and 5.5 metres by 2500.

Even in the most optimistic scenario, which requires extremely dramatic climate-change goals, major technological advances and strong international co-operation to stop emitting greenhouse gases and polluting the atmosphere, the sea would rise 60cm by 2100 and 1.8 metres by 2500.

The two more realistic scenarios, based on stablising emissions and pollution, show a sea-level rise of about 75cm by the year 2100 and 2 metres by 2500.

RECORD OZONE LOSS OVER THE ARTIC

The loss of ozone over the Arctic this year was so severe that for the first time it could be called an 'ozone hole' like the Antarctic one. The study, published in Nature, is reported on the the BBC's website.

About 20km above the ground 80% of the ozone was lost.

This is the report in ScienceDaily.