"It's dramatic. It's disturbing," University of Delaware professor Andreas Muenchow, tells The Associated Press. "We have data for 150 years and we see changes that we have not seen before. ... It's one of the manifestations that Greenland is changing very fast."
A view of the glacier taken midday Monday. Inside the square: the area that was starting to break off.
NASA Earth Observatory
"Many of Greenland's southern glaciers have been melting at an unusually rapid pace. The Petermann break brings large ice loss much farther north than in the past, said Ted Scambos, lead scientist at the National Snow and Ice Data Center in Boulder, Colo.
"If it continues, and more of the Petermann is lost, the melting would push up sea levels, he said. The ice lost so far was already floating, so the breaks don't add to global sea levels."
The iceberg that broke off in 2010 "headed north, then west and last year started landing in Newfoundland," AP says.
The Artic Sea Ice Blog has posted video taken in June 2011 of some of that iceberg's chunks.