[4] He summarised the knowledge of the science at the time, the anthropogenic attribution of the carbon dioxide greenhouse gas, distribution and exponential rise, findings which still hold today.
Bushby he devised the well-known 'baroclinic' model for numerical forecasting, using electronic computation, which is rightly regarded as a landmark in this difficult subject.
His work on the characteristics of fronts is one of the few successful attempts to deal quantitatively with the dynamics (as distinct from the kinematices) of these important phenomena.
He has done markedly original work on dynamical similarity in meteorology and his recent numerical calculations of air flow over mountains are believed to be the first realistic computations of their kind.
In addition, he has contributed much to the detailed analysis of the salient features of large-scale atmospheric disturbances, including studies of the rainfall of depressions, the behaviour of the tropopause, and the cloud systems associated with fronts.