AQD - Model type Submitted None Data Dictionary Vocabularies Eionet Data Dictionary eulerian Atmospheric numerical model. Eulerian models define specific reference points in a gridded system that monitors atmospheric properties, including temperature, pressure, chemical concentration of tracers, over time. Being the representative of the Eulerian model, the Unified Model divides the world up into fixed grid cells which allows for modelling the interactive chemistry within the atmosphere, regarded as a three - dimensional single fluid, and applying well - developed convection parameterisation scheme to represent convective motions. Valid Data Dictionary Vocabularies Eionet Data Dictionary AQD - Model type gaussian plume Gaussian plume. Valid Data Dictionary Vocabularies Eionet Data Dictionary AQD - Model type lagrangian Atmospheric numerical model. Lagrangian models take the perspective of a finite element or so - called ‘air parcel’. Over time both the position and properties of this air parcel are calculated according to the mean wind field data. The path along which air parcel travels is called its trajectory. It can be expressed as a differential equation. Advanced equation for the trajectory contains two components: mean winds and random turbulence. Valid Data Dictionary Vocabularies Eionet Data Dictionary AQD - Model type