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Ice sheet mass loss rate is documented in the IPCC AR5 paper “Summary for Policy Makers” under Section B Observed Changes/B3 Cyrosphere and is reproduced in part below; • The average rate of ice loss from the Greenland ice sheet has very likely substantially increased from 34 Gt per yr over the period 1992–2001 to 215 Gt per yr over the period 2002–2011. • The average rate of ice loss from the Antarctic ice sheet has likely increased from 30 Gt per yr over the period 1992–2001 to 147 Gt per yr over the period 2002–2011. In summary the average ice sheet mass loss globally has risen exponentially from 64 Gt per year in the 1990s decade to 362 Gt per year in the 2000s decade and calculates as a doubling time of about 5 years. Measurements from Earth-orbiting satellites including GRACE and the European Space Agency CryoSat-2, also show acceleration of ice mass loss. Using NASA data taken from their graph at also shows a doubling time of just over 5 years for Antarctica and Greenland combined. Using ice melt data Jim Hansen, former Director of NASA’s Goddard Institute of Space Studies, has calculated a 1 metre sea level rise (SLR) by 2045 for a 5 year ice melt doubling period, 2055 for a 7 year doubling period and 2067 for a 10 year doubling period. See‎ These predictions are much earlier than the IPCC AR5 BAU ‘extreme’ SLR prediction of 0.98m by 2100. For coastal planning policy makers it would be wise to continually monitor land ice melt acceleration rates as this will give more certainty to sea level rise predictions.
Toggle Commented Mar 19, 2014 on PIOMAS March 2014 at Arctic Sea Ice
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Mar 18, 2014