Thursday, August 30, 2012
Reduction in Variance - It's the Current Trend
Since I have stated that the variance of the data sets is decreasing but noise makes it hard to prove, the chart above is the plot of all Plain Vanilla UAH regions land and ocean , 131 month standard deviations of the detrended data sets. The chart is busy but neat looking. You can see not only that the standard deviation is lower at the end, reduction in variance, but where the majority of the reduction is happening. The dip plateau feature of the tropical data sets is pretty unusual looking.
The top light blue curve is the Northern Polar oceans. After this years sea ice melt, the change in that data set will be interesting.