The gray - shaded region shows two standard deviations from the average daily sea ice extent. (sciencenewsforstudents.org)
With coordinated experiments with six atmospheric general circulation models, forced by observed daily sea - ice concentration and sea surface temperatures. (sciencedaily.com)
This graph shows daily sea ice difference from average in units of the standard deviation (based on 1981 - 2010 variation from the average) for this period. (nsidc.org)