Pangolin v1.0, a conservative 2-D advection model towards large-scale parallel calculation

• Main Authors: A. Praga, D. Cariolle, L. Giraud
• Format: Article
• Language: English
• Published: Copernicus Publications 2015-02-01
• Series: Geoscientific Model Development
• Online Access: http://www.geosci-model-dev.net/8/205/2015/gmd-8-205-2015.pdf

To exploit the possibilities of parallel computers, we designed a large-scale bidimensional atmospheric advection model named Pangolin. As the basis for a future chemistry-transport model, a finite-volume approach for advection was chosen to ensure mass preservation and to ease parallelization. To overcome the pole restriction on time steps for a regular latitude–longitude grid, Pangolin uses a quasi-area-preserving reduced latitude–longitude grid. The features of the regular grid are exploited to reduce the memory footprint and enable effective parallel performances. In addition, a custom domain decomposition algorithm is presented. To assess the validity of the advection scheme, its results are compared with state-of-the-art models on algebraic test cases. Finally, parallel performances are shown in terms of strong scaling and confirm the efficient scalability up to a few hundred cores.