In the new study, the researchers searched for such events recorded in sea surface temperature data recorded as far back as 1900 and in satellite data since 1982. (sciencenews.org)
Also lots of discussion about the surface temperature data records. (judithcurry.com)
Kalnay and Cai developed a more precise measurement by comparing one set of long - term temperature data recorded from satellite and weather balloons, which detect the effects of warming from greenhouse gases, with another set recorded at ground level by 1,982 weather stations across the continent. (discovermagazine.com)