Abstract
AbstractTransport of the short‐lived (half‐life 3.83 days) isotope 222Rn, which is emitted from unfrozen soils, is used to compare transport in several versions of the UK Meteorological Office Lagrangian chemistry‐transport model and in the Unified Model, the UK Meteorological Office general circulation model. The same 222Rn experiment is repeated for all the model versions, illustrating the impact on global transport of various model improvements: adding boundary‐layer schemes, including sub‐grid scale convection, increasing model spatial resolution, and increasing the temporal resolution of the meteorological fields used for driving the off‐line model. Results from all model versions are compared with a limited observational data set, and also with results from the same 222Rn simulations carried out with several global atmospheric transport models as part of the World Climate Research Program in December 1993 (Jacob et al. 1997). Versions of the Lagrangian chemistry‐transport model that include sub‐grid scale convection, transport 222Rn in a manner that is similar to the Unified Model and most general circulation models, supporting the simple and computationally inexpensive Lagrangian approach taken.
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