A paper published today in Geophysical Research Letters finds that even under the most exaggerated "strongest" forcing scenario simulated by climate models, the Arctic "becomes summer ice-free by the end of the 21st century and year-round ice-free by the end of the 23rd century." Leaving aside that climate models offer little more than simulating a random walk, many alarmist climate scientists have had no shame from incorrectly predicting a year-round ice-free Arctic many times in the past or within the next two years.
Implications of Arctic sea ice changes for North Atlantic deep convection and the meridional overturning circulation in CCSM4-CMIP5 simulations
M. M. Holland
Abstract: Using CCSM4 climate simulations for 1850–2300 with four different future forcing scenarios, we show that the maximum strength of the Atlantic meridional overturning circulation (MOC) decreases proportionally to the applied CO2 forcing. This weakening of the overturning is caused by a reduction or shut down of North Atlantic (NA) deep convection due to a surface freshening. In the Labrador Sea, the surface freshening is caused by strongly increased liquid freshwater exports from the Arctic, which are largely due to the decrease in the Arctic sea ice cover. In the strongest forcing scenario (RCP8.5), the Arctic becomes summer ice-free by the end of the 21st century and year-round ice-free by the end of the 23rd century. As a result of the associated freshening, all NA deep convection ceases by 2145, which leads to a 72% (18 Sv) decrease of the MOC strength by the end of the simulation in 2300.