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Additionally, the line in the chart shows the sum of the daily anomalies for the season in question. This year, we've been much warmer than the 1980-2010 median temperatures, so most of the daily anomalies have been negative. Add all those negative daily anomalies (not as cold this year as is typical), and you have the line that is headed off the graph.
Toggle Commented Apr 5, 2016 on Winter analysis addendum at Arctic Sea Ice
Greg, My understanding of it is as follows: If the temp is -10C for the day (average?), that would add 10 FDD to the season total. If, over the 1980-2010 period, the median temperature for that day is -8C, that day would have a +2FDD anomaly in the chart above. I'd welcome corrections.
Toggle Commented Apr 5, 2016 on Winter analysis addendum at Arctic Sea Ice
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Apr 5, 2016