By Dr. Roy Spencer
…or, OMG! HAS UAH BEEN BOUGHT OFF BY GREENPEACE!?
Over the last ten years or so there has been a growing inconsistency between the UAH and Remote Sensing Systems versions of the global average lower tropospheric temperature anomalies. Since I sometimes get the question why there is this discrepancy, I decided it was time to address it.
If we look at the entire 30+ year record, we see that the UAH and RSS temperature variations look very similar, with a correlation coefficient of 0.963 and linear trends which are both about +0.14 deg. C per decade:
(In the above plot I have re-computed the RSS anomalies so they are relative to the 1981-2010 average annual cycle we use; this does not affect the trends…just makes it more of an apples-to-apples comparison).
But if we examine a time series of the DIFFERENCE between the two temperature records, we see some rather interesting structure:
Also, based on a conversation with Roy at ICCC and minor change in naming conventions, I am pleased to announce that Dr. Roy Spencer’s UAH Lower Atmosphere Temperature Chart is now available on WUWT’s Global Climatic History Page and Atmosphere Page.
If you really like to keep an eye on Atmospheric Temperatures it is recommended that you visit the University of Alabama at Huntsville’s Discover AMSU Temperature Page, which offers daily atmospheric temperatures from a range of heights based upon the Aqua satellite.