Nevertheless, if structural uncertainties in observations and models are fully accounted for, a partial resolution of the long - standing «differential warming» problem has now been achieved. (realclimate.org)
Model forecasts are verified against model control simulations (perfect model experiments), thus overcoming to some extent issues of uncertainties in the observations and / or model parameterizations. (pacificclimate.org)
However, the ability to interpret some changes, particularly for non-temperature variables, is limited by uncertainties in the observations, physical understanding of the climate system, climate models and external forcing estimates. (ipcc.ch)