We seem to be going in circles. No one argues that the SST of in the Sargasso was warmer than than it is now. What Keigwin put it down to is a shift in the currents. Different currents - different temperatures. I did go through this before with WOSG.
If you want to argue that a warming in the world caused a change in the NAO which caused a warmer current to move then fine. But that is not what Soon says or that you have argued.
Wake me if you find something good.
I am making steady progress. You are the one repeating yourself. There wasn't a 0.4 C warming since 1980, there is a 0.1 to 0.15 degree bias in that estimate. The increase since 1980 is a deviation comparable to many other decades in the past and doesn't show up in some of the proxy measurements (e.g. briffa-1998).
The answers I have gotten so far are:
* there were decades in the MWP (and even in the LIA) warmer than the 80's and 90's.
* There was an increase in temperature during the 1900's as a whole, but mostly concentrated before 1950.
* There was variability between periods throughout history that match the variability in this century.
* The Mann 98 deliberately smoothed out historical data to hide that variability.
* That paper did not smooth the 1980's and 1990's and used surface measurements with bias in place of proxies.
* I can conclude, so far, that hockey stick is an artifact.
* But I can't make the MWP warmth conclusion yet globally, I need to look at more data.