The results over time may vary as a function of a) the input data (which change due to corrections, increasing archived data, changes in homogeneity adjustments,
bias corrections etc. made by others — including the National Met Services), b) the method (all of which are documented in the various papers).
Not exact matches
In this case, there has been an identification of a host of small issues (and, in truth, there are always small issues in any complex field) that have involved the fidelity of the observations (the spatial coverage, the
corrections for known
biases), the fidelity of the models (issues with the forcings, examinations of the variability in ocean vertical transports
etc.), and the coherence of the model - data comparisons.
That means using meta - data, using
corrections of known
biases, comparing near - by stations, correcting for UHI
etc..
al. 2007 made no recommendations as to how an overall
bias correction should be made, but did point out the difficulties of normalizing SST, wind speed, temp, barometric pressure,
etc..
15, including the latest orbits, tide models, sea - state
bias models, water vapor
corrections,
etc..