Lucia, Anthony, Roy Spencer and David Stockwell (my, there’s a growing list of analytical blogs) have already posted on March 2009 temperatures and trends. While I’m not first off the mark on this, I’ll be the first to post tropical trends – something that I do from time to time. (This requires a little bit of heavy lifting since I need to download the entire gridded data sets from NOAA, CRU and GISS to determine their tropical averages.) Maybe I’ll keep this script private from the others for a while :)
The plot below shows the following series with their trend (deg C/decade in brackets): UAH T2LT (0.014), RSS TLT (0.09), CRU (0.103), NOAA (0.117), GISS (0.132), HadAT 850 hPa radiosonde (-0.001) and the following two series not shown UAH T2 (-0.013) and RSS TMT (0.066). The satellite and radiosonde series are the tropical troposphere series where Santer says that there is no statistically significant difference between observations and models for either the UAH or RSS data sets (this being the subject of a submission by Ross and I to IJC – on which still no response.)
For comparison, the multimodel mean trends (deg C/decade) reported by Santer et al were surface (0.13), T2LT (0.215) and T2 (0.199).