Bias in the global mean temperature estimated from sampling a greenhouse warming pattern with the current surface observing network

It is important to know how well our observing network will be able to capture the global mean temperature rise associated with this pattern if it occurs. The authors consider if a sampling bias exists as a result of the spatial distribution of observations as they are now located (1950-1979) when detecting a pattern of temperature change that should be typical of a warming due to increasing atmospheric CO₂. The observations prove adequate to estimate the globally averaged temperature change associated with the pattern of CO₂ warming from a general circulation model with a bias whose absolute value is generally less than 2%. -from Authors