Is there any comparison of temps that only
include comparable data over that time period?
I mean, we have temp sensors in many more places now than compared to back then. If we only sample the data from the same areas that were recorded back then, what does it show?
It was actually stated by NASA a while back that the sudden increases in global temperature measurements were due to the inclusion of the polar regions, since the rest of the planet has been relatively stable, and central Antarctica has yet to warm, I'm guessing the results would be nill warming. They don't have surface records going back to the last period when ice sheets were in retreat. Yes, this happened earlier in the century too, look into arctic temperatures in the 30's a 40's. They weren't quite as high as current temps, just the mid 90's. As far as I know, the Russians are the only ones that were checking sea ice extent at the time, so actual retreat is a partial record. There is however a definite 20 year period of substantially warmer than average arctic water temperatures, which would lead to loss and a resulting significant shift in surface temperatures above the affected areas.
And if 2010 is the new warmest year on record?
Is this the warmest year on record according to analysis of methods for determining historical temperature, warmest year on record going by a static set of monitoring stations spanning back x years of time, or warmest year on record according to all the new places we weren't checking earlier?
If 2010 were actually the warmest year on record, that would be something. I am, by preponderance of evidence, convinced of no such thing regarding the recent record setting temperatures. The evidence has been listed previously by multiple posters.
There is an upward trend, make of it what you will.
I would like to know two things. One, is the station properly maintained and not a victim of urban sprawl, and two, was the paint switched from whitewash to latex, if so when. From what I've read on the paint switch, it can be as much as two degrees depending on the amount of clear weather the place recieves. If it's in the middle of a parking lot as well, you're in one hell of a deep freeze right now.