Sentences with phrase «sheet over a millennium»
Sustained warming greater than some threshold would lead to the near - complete loss of the Greenland ice sheet over a millennium or more, causing a global mean sea - level rise of up to 7 meters [23 feet](high confidence).
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That estimate was based in part on the fact that sea level is now rising 3.2 mm / yr (3.2 m / millennium)[57], an order of magnitude faster than the rate during the prior several thousand years, with rapid change of ice sheet mass balance over the past few decades [23] and Greenland and Antarctica now losing mass at accelerating rates [23]--[24].
In one projected event, large parts of the ice sheet melt and drain into the ocean over the next millennia, raising global sea levels by several tens of meters.
It is certainly possible and may be likely for the polar ice sheets to disappear, causing sea level rise (SLR) of 22 + / - 10 metres over coming millennia.
Thus even there, a new equilibrium is reached in a few decades (for extra CO2 over current land occupation) to millennia (for ice sheet retraction and plant spread).
Clouds modulate Earth's energy budget over millennia and more — second only to runaway ice sheet feedbacks leading to glacials every 100,000 odd years.
The growth and decay of continental ice sheets represents a slow feedback operating over millennia; if one is concerned with the more rapid response of the climate to CO2, ice sheets have to be accounted for as a major forcing.
In addition there are slow climate feedbacks, such as changes of ice sheet size, that occur mainly over centuries and millennia.
That estimate was based in part on the fact that sea level is now rising 3.2 mm / yr (3.2 m / millennium)[57], an order of magnitude faster than the rate during the prior several thousand years, with rapid change of ice sheet mass balance over the past few decades [23] and Greenland and Antarctica now losing mass at accelerating rates [23]--[24].
There is medium confidence that at least partial deglaciation of the Greenland ice sheet, and possibly the West Antarctic ice sheet, would occur over a period of time ranging from centuries to millennia for a global average temperature increase of 1 - 4 °C (relative to 1990 - 2000), causing a contribution to sea - level rise of 4 - 6 m or more.