He would then have seen that the problem was caused by the manner in which the land based thermometer record had been adjusted throughout the 1980s and 1990s. (notrickszone.com)
While satellites clearly have some advantages over the surface thermometer record, such as better sampling, measuring temperature from a satellite is actually an incredibly difficult problem. (skepticalscience.com)
There was only one temperature swing of this size in the oldest thermometer record which dates back 350 years, and it was a down swing. (zfacts.com)