The lack of sea ice in October in recent years at Barrow is having a major impact on the climate. Here is a plot of the mean October temperature in Barrow since 1920. Two things to note. First, the running mean is now higher than it has been in the past 85 years. Second, there is very little variation: the bottom brown line is the 5 year running standard deviation, which has collapsed. This is completely attributable to the moderating influence of the water.
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