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from the did-they-expect-to-find-handwarmers? dept.
OSLO (Reuters) - Natural swings in the Arctic climate have caused up to half the precipitous losses of sea ice around the North Pole in recent decades, with the rest driven by man-made global warming, scientists said on Monday.
The study indicates that an ice-free Arctic Ocean, often feared to be just years away, in one of the starkest signs of man-made global warming, could be delayed if nature swings back to a cooler mode.
Natural variations in the Arctic climate "may be responsible for about 30–50 percent of the overall decline in September sea ice since 1979," the U.S.-based team of scientists wrote in the journal Nature Climate Change.
Sea ice has shrunk steadily and hit a record low in September 2012 -- late summer in the Arctic -- in satellite records dating back to 1979.
(Score: 0) by Anonymous Coward on Wednesday March 15 2017, @10:06AM (1 child)
it must be dominated by feedbacks since the temperature is the same as on earth when adjusted for pressure and insolation.
I think you don't understand what feedbacks mean since you just said the completely OPPOSITE.
(Score: 0) by Anonymous Coward on Wednesday March 15 2017, @03:36PM
No, for planets with sufficiently complex atmospheres there are apparently two important factors:
1) Amount of incoming energy,
2) Mass of the overlying atmosphere (as measured via pressure).
All other factors (clouds, rain, greenhouse gas, rotation of planet, winds, etc) feedback on each other to maintain an equilibrium.