Arctic lost part of its perennial sea ice in 2005: NASA

Global warming may already be having an effect on the Arctic which in 2005 only replaced a little of the thick sea ice it loses and usually replenishes annually, a NASA study said Tuesday.

Scientists from the US space agency used satellite images to analyze six annual cycles of Artic sea ice from 2000 to 2006.  Sea ice is essential to maintaining and stabilizing the Arctic’s ice cover during its warmer summer months.

But “recent studies indicate Arctic perennial ice is declining seven to 10 percent each decade,” said Ron Kwok from NASA’s Jet Propulsion Laboratory in Pasadena, California.

“Our study gives the first reliable estimates of how perennial ice replenishment varies each year at the end of the summer.  The amount of first-year ice that survives the summer directly influences how thick the ice cover will be at the start of the next melt season.”

More info:  AFP news article

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