Guest Post by Willis Eschenbach
Over at Roy Spencer’s excellent web site, Dr. Roy has a post up showing a sea surface temperature (SST) anomaly calculated from AMSR-E, TMI, and WindSat. Here’s his post of the results:
Regarding these results, Dr. Roy says:
The anomalies are computed relative to only 2003-2006 because those years were relatively free of El Nino and La Nina activity, which if included would cause temperature anomaly artifacts in other years. Thus, these anomalies cannot be directly compared to, say, the Reynolds anomalies which extend back to the early 1980s.
So I figured I’d give him a hand by using the same 2003-2006 monthly anomaly baseline for the Reynolds Optimal Interpolation (OI) sea surface temperature, so we could have a longer dataset, and to see how his results compare to the Reynolds OI data.
I started by datapointing Dr. Roy’s data. I digitized it, and entered it into Excel.
Then I downloaded the Reynolds SST data (actual, not anomalies) from KNMI for the same area of the planet, 60°N to 60°S. Finally, I figured the monthly averages for the 2003-2006 period, and subtracted them from the Reynolds actual data to give the anomalies. Figure 2 shows the results:
Not much to say, except that Dr. Roy’s results agree pretty well with the Reynolds OI data, and that there’s been no significant increase or decrease in SST in the last 15 years or so …
All data and calculations are here as an Excel spreadsheet.
My best regards to everyone,