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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export HDF5_USE_FILE_LOCKING=FALSE |
Anvil: Soon..Chrysalis: Soon..
prepare environment for intel18 compiler:
source /lcrc/soft/climate/moab/anvil/intel18/anvil_env.sh
MOAB_DIR=/lcrc/soft/climate/moab/anvil/intel18
TEMPESTREMAP_DIR=/lcrc/soft/climate/tempestremap/anvil/intel18
Chrysalis:
prepare environment for intel compiler:
source /lcrc/soft/climate/moab/chrysalis/intel/chrys_intel.env
MOAB_DIR=/lcrc/soft/climate/moab/chrysalis/intel
TEMPESTREMAP_DIR=/lcrc/soft/climate/tempestremap/chrysalis/intel
Note: the serial executables need to be launched with mpiexec -np 1, if on login node.
(otherwise you may get an error like :
mbpart -h
Abort(1091087) on node 0 (rank 0 in comm 0): Fatal error in PMPI_Init: Other MPI error, error stack:
MPIR_Init_thread(136):
MPID_Init(950).......:
MPIR_pmi_init(168)...: PMI2_Job_GetId returned 14 )
Best practice is to use an interactive session on a compute node.
srun -N 1 -t 10 --pty bashCompy:
After several iterations to get the dependency stack correct with respect to compatible parallel HDF5 and NetCDF installations by sysadmins on Compy, the other required dependencies were installed successfully and verified/tested to run without issues. Now mbtempest tool is accessible from $MOAB_DIR (see below).
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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.