"The Arctic used to be dominated by multi-year ice, or ice that stayed around for several years," said Meier said.
"Now it's becoming more of a seasonal ice cover and large areas are now prone to melting out in summer," said Serreze.
"These figures are not the result of some freak of nature but the effects of man-made global warming caused by our reliance on dirty fossil fuels," said John Sauven, the Greenpeace U.K. director.
"These preliminary figures provide irrefutable evidence that greenhouse gas emissions leading to global warming are damaging one of the planet's critical environments, one that helps maintain the stability of the global climate for every citizen of the world," said Sauven.
Arctic sea ice follows an annual cycle of melting through the warm summer months and refreezing in the winter. It has shown a dramatic overall decline over the past 30 years.
"Record-breaking ice minimums are becoming the new normal," says Clive Tesar, of WWF's global Arctic program. "We're breaking records on a regular basis as the sea ice continues its decline."
According to many scientists, the sea ice plays a critical role in regulating climate, acting as a giant mirror that reflects much of the sun's energy, helping to cool the Earth.
The formation of the sea ice produces dense saltwater, which sinks, helping drive the deep ocean currents. Without the ice, many scientists fear this balance could be upset, potentially causing major climatic changes.
Intellpuke: You can read this article by Guardian Environment Editor John Vidal in context here: www.guardian.co.uk/environment/2012/aug/27/arctic-sea-ice-shrinks-lowest-extent