The result now look much more like RSS. The big things that made this happen seem to be that
- UAH now uses a previously deprecated diurnal correction
- UAH has reduced sensitivity to land surface emission, making it a more purely tropospheric measure (and more different from surface)
Incidentally, Dr Spencer's announcement is very informative on how the UAH sausage is made.
I was curious to see what difference it made to the back trend plots, as available here with the trendback button. It shows the trend from the various years on the x-axis to present. UAH is now similar to RSS, though not as low, and the pause is back. And the distinction between surface and troposphere indices is very clear. Here is the plot: