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Towards convection-resolving, global atmospheric simulations with the Model for Prediction Across Scales (MPAS) v3.1: an extreme scaling experiment

Heinzeller, Dominikus; Duda, Michael G.; Kunstmann, Harald

Abstract:
The Model for Prediction Across Scales (MPAS) is a novel set of Earth system simulation components and consists of an atmospheric model, an ocean model and a land-ice model. Its distinct features are the use of unstructured Voronoi meshes and C-grid discretisation to address shortcomings of global models on regular grids and the use of limited area models nested in a forcing data set, with respect to parallel scalability, numerical accuracy and physical consistency. This concept allows one to include the feedback of regional land use information on weather and climate at local and global scales in a consistent way, which is impossible to achieve with traditional limited area modelling approaches. Here, we present an in-depth evaluation of MPAS with regards to technical aspects of performing model runs and scalability for three medium-size meshes on four different high-performance computing (HPC) sites with different architectures and compilers.We uncover model limitations and identify new aspects for the model optimisation that are introduced by the use of unstructured Voronoi meshes.We further demonstrate the model performance of MPAS in terms of ist capability to reproduce the dynamics of the West African monsoon (WAM) and its associated precipitation in a pilot study. ... mehr

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Volltext §
DOI: 10.5445/IR/1000055965
Originalveröffentlichung
DOI: 10.5194/gmd-9-77-2016
Scopus
Zitationen: 17
Web of Science
Zitationen: 15
Cover der Publikation
Zugehörige Institution(en) am KIT Fakultät für Physik (PHYSIK)
Institut für Meteorologie und Klimaforschung - Atmosphärische Umweltforschung (IMK-IFU)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2016
Sprache Englisch
Identifikator ISSN: 1991-959X, 1991-9603
urn:nbn:de:swb:90-559653
KITopen-ID: 1000055965
HGF-Programm 12.02.03 (POF III, LK 01) Regional Climate-and Water Cycle Variab.
Erschienen in Geoscientific model development
Verlag Copernicus Publications
Band 9
Heft 1
Seiten 77-110
Nachgewiesen in Scopus
Web of Science
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