As part of the efforts in the CMDV project, interfaces to integrate the MOAB unstructured mesh library with the TempestRemap remapping tool have been undertaken. Detailed information on the algorithmic and implementation aspects of this effort have been written in a manuscript submitted to Geoscientific Model Development [1]. This work has led to the development of a new offline remapping tool called mbtempest, which exposes the functionality to compute the supermesh or intersection mesh between two unstructured source and target component grids, in addition to using this supermesh for computing the remapping weights to project solutions between the grids. This functionality is part of the critical worflow with E3SM, where the generated remapping weights in the offline step are consumed by MCT at runtime to seamlessly transfer solution data between components (atm↔ocn, atm↔lnd, etc).
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Cori: Updated sources of TempestRemap and MOAB have been pre-installed along with all required dependencies on some of the standard machines. The MOAB installation is available on Cori within the E3SM project space: `/project/projectdirs/acme/software/moab` and the corresponding TempestRemap installation is at /project/projectdirs/acme/software/tempestremap. The workflow for generating the offline maps using these installed tools is described below.
Anvil: Soon..
Ex: mbtempest workflow for generating ne30 offline maps
In this section the workflow for generating offline maps for the ne30 case is shown. This can be used as a template to generate maps between ATM-OCN for any resolution combination of CS and ICOD meshes. First define the environment variables for MOAB_DIR based on the installation on your local folder or use a pre-installed version that is available on Cori at export MOAB_DIR=/project/projectdirs/acme/software/tempestremap.
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If steps (a)-(g) pass successfully, the MOAB libraries and tools, along with interfaces for TempestRemap will be installed in $INSTALL_PREFIX/moab directory. The offline remapping weight computation tool, mbtempest, will also be installed during this process and can then be used standalone to generate the weight files as needed.
References
1 Mahadevan, V. S., Grindeanu, I., Jacob, R., and Sarich, J.: Improving climate model coupling through a complete mesh representation: a case study with E3SM (v1) and MOAB (v5.x), Geosci. Model Dev. Discuss., https://doi.org/10.5194/gmd-2018-280, in review, 2018.