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Tag: arctic
Ice-free arctic in Pliocene, last time CO2 levels above 400 ppm
2013-05-11 16:00:00| Climate Ark Climate Change & Global Warming Newsfeed
ClimateWire: Scientists trying to determine how the Earth might change as temperatures rise often look back in time to a period around 3.6 million years ago called the middle Pliocene, when concentrations of carbon dioxide ranged from about 380 to 450 parts per million. (Today they are nearing 400.) A study published yesterday in the journal Science analyzed the longest land-based sediment core ever taken in the Arctic and found that during this period, from 3.6 million to 2.2 million years ago, the area around...
Icy Arctic rising as economic, security hot spot
2013-05-11 16:00:00| Climate Ark Climate Change & Global Warming Newsfeed
Associated Press: The icy Arctic is emerging as a global economic hot spot -- and one that is becoming a security concern for the U.S. as world powers jockey to tap its vast energy resources and stake out unclaimed territories. Diplomats from eight Arctic nations, including Secretary of State John Kerry, will meet next week over how to protect the thawing region as its waterways increasingly open to commercial shipping traffic. U.S. officials estimate the Arctic holds 13 percent of the world's undiscovered oil...
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security
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Arctic drilling: Coast Guard monitoring, enforcement feel pinch of sequester
2013-05-11 16:00:00| Climate Ark Climate Change & Global Warming Newsfeed
EnergyWire: The Coast Guard is cutting back its Arctic operations this summer to meet the across-the-board federal budget cuts imposed by Congress under sequestration. Coast Guard officials are completing plans for a scaled-back Arctic monitoring and enforcement program, which might be based out of Kotzebue along Alaska's northwestern coast. Because of budget cuts, the Arctic Shield 2013 program is likely to be conducted during July and September only. Last year's operations, which ran through the four-month...
Tags: feel
coast
monitoring
guard
Ice Cores Reveal Green Arctic
2013-05-11 01:14:00| Climate Ark Climate Change & Global Warming Newsfeed
Scientific American: The Arctic wasn't always covered in ice. Samples of sediment layers beneath a frozen lake show this region used to be a lot warmerand may thaw out again in the future. The work is in the journal Science. El'gygytgyn, a Russian lake 100 kilometers north of the Arctic Circle, contains layers of sediment that date back to the lake's formation 3.6 million years ago. Analyses of sediment cores have revealed that back then summers reached about 15 to 16 degrees Celsius, a good 8 degrees warmer than modern...
Ice-free Arctic may be in our future
2013-05-09 21:54:00| Climate Ark Climate Change & Global Warming Newsfeed
ScienceDaily: Analyses of the longest continental sediment core ever collected in the Arctic, recently completed by an international team led by Julie Brigham-Grette of the University of Massachusetts Amherst, provide "absolutely new knowledge" of Arctic climate from 2.2 to 3.6 million years ago. "While existing geologic records from the Arctic contain important hints about this time period, what we are presenting is the most continuous archive of information about past climate change from the entire Arctic...
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future
arctic
icefree
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