Title: The Two-Way Nested Global Chemistry Transport Model TM5
Authors: KROL M.HOUWELING SanderBREGMAN B.VAN DEN BROEK M.SEGERS A.PETERS WouterDENTENER FRANCISCUSBERGAMASCHI PETER
Citation: ATMOSPHERIC CHEMISTRY AND PHYSICS vol. 5 p. 417-432
Publisher: European Geosciences Union
Publication Year: 2005
JRC Publication N°: JRC32392
URI: http://publications.jrc.ec.europa.eu/repository/handle/JRC32392
Type: Articles in Journals
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 Institute:Institute for Environment and Sustainability

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