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|Title:||The Two-Way Nested Global Chemistry Transport Model TM5|
|Authors:||KROL M.; HOUWELING Sander; BREGMAN B.; VAN DEN BROEK M.; SEGERS A.; PETERS Wouter; DENTENER FRANCISCUS; BERGAMASCHI PETER|
|Citation:||ATMOSPHERIC CHEMISTRY AND PHYSICS vol. 5 p. 417-432|
|Publisher:||European Geosciences Union|
|Type:||Articles in periodicals and books|
|Abstract:||This paper describes the global chemistry Transport Model, version 5 (TM5) which allows two-way nested zooming. The model is used for global studies which require high resolution regionally but can work on a coarser resolution globally. The zoom algorithm introduces refinement in both space and time in some predefined regions. Boundary conditions of the zoom region are provided by a coarser parent grid and the results of the zoom area are communicated back to the parent. A case study using 222Rn measurements that were taken during the MINOS campaign reveals the advantages of local zooming. As a next step, it is investigated to what extent simulated concentrations over Europe are influenced by using an additional zoom domain over North America. An artificial ozone-like tracer is introduced with a lifetime of twenty days and simplified non-linear chemistry. The concentration differences at Mace Head (Ireland) are generally smaller than 10%, much smaller than the effects of the resolution enhancement over Europe. Thus, coarsening of resolution at some distance of a sampling station seems allowed. However, it is also noted that the budgets of the tracers change considerably due to resolution dependencies of, for instance, vertical transport. Due to the two-way nested algorithm, TM5 offers a consistent tool to study the effects of grid refinement on global atmospheric chemistry issues like intercontinental transport of air pollution.|
|JRC Directorate:||Sustainable Resources|
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