Massively Parallel Global Climate Model for Paleoclimate Applications Page: 4 of 87
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EXECUTIVE SUMMARY
GENESIS Version 2.0 is a general circulation model developed at the National Center for
Atmospheric Research (NCAR) and is the principal code that is used by paleoclimatologists to
model climate at various times throughout Earth's history. The primary result of this LDRD
project has been the development of a distributed-memory parallel version of GENESIS, leading
to a significant performance enhancement on commodity-based, large-scale computing platforms
like the CPlant. The shared-memory directives of the original version were replaced by MPI
calls in the new version of GENESIS. This was accomplished by means of parallel
decomposition over latitude strip domains. The code achieved a parallel speedup of four times
that of the shared-memory parallel version at R 15 resolution. T106 resolution runs 20 times
faster than the NCAR serial version on 20 nodes of the CPlant. As part of the project, GENESIS
was used to model the climatic effects of an orbiting debris ring due to a large planetary impact
event.4
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Boslough, Mark B. E. Massively Parallel Global Climate Model for Paleoclimate Applications, report, June 1, 2002; Albuquerque, New Mexico. (https://digital.library.unt.edu/ark:/67531/metadc737974/m1/4/: accessed April 19, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.