The increase was due almost completely to increased ice loss rates in southern Greenland (Velicogna and Wahr 2006a). (nsidc.org)
On average the daily ice loss rate for the Arctic as a whole during August was -54,000 square million square kilometers per day, or about average. (searcharcticscience.org)
But as to your conclusion, you state: «The sea ice loss rate seems to be very sensitive to model resolution and has improved in CMIP5 — implicating aspects of the model structure as the main source of the problem.» (realclimate.org)