########################## GEOS-Chem High Performance ########################## .. raw:: html

The `GEOS--Chem model `_ is a global 3-D model of atmospheric composition driven by assimilated meteorological observations from the Goddard Earth Observing System (GEOS) of the `NASA Global Modeling and Assimilation Office `_. It is applied by `research groups around the world `_ to a wide range of atmospheric composition problems. * `GEOS-Chem Overview `_ * `Narrative description of GEOS-Chem `_ This site provides instructions for GEOS-Chem High Performance, GEOS-Chem's multi-node variant. We provide two different instruction sets for downloading and compiling GCHP: from a clone of the source code, or using the Spack package manager. Cloning and building from source code ensures you will have direct access to the latest available versions of GCHP, provides additional compile-time options, and allows you to make your own modifications to GCHP's source code. Spack automates downloading and additional parts of the compiling process while providing you with some standard togglable compile-time options. Our `Quick Start Guide `__ and the `downloading `__, `compiling `__, and `creating a run directory `__ sections of the User Guide give instructions specifically for using a clone of the source code. Our dedicated `Spack guide `__ describes how to install GCHP and create a run directory with Spack, as well as how to use Spack to install GCHP's dependencies if needed. .. toctree:: :maxdepth: 1 :caption: Getting Started getting-started/quick-start.rst getting-started/requirements.rst getting-started/key-references.rst .. toctree:: :maxdepth: 2 :caption: User Guide user-guide/downloading.rst user-guide/compiling.rst user-guide/rundir-init.rst user-guide/getting-input-data.rst user-guide/running.rst user-guide/configuration-files.rst user-guide/rundir-config.rst user-guide/output_files.rst user-guide/plotting-output.rst user-guide/debugging.rst .. toctree:: :caption: GEOS-Chem Simulations :maxdepth: 1 supplement/gchp-simulations.rst geos-chem-shared-docs/simulations/carbon.rst geos-chem-shared-docs/simulations/fullchem.rst geos-chem-shared-docs/simulations/tago3.rst geos-chem-shared-docs/simulations/transport-tracers.rst .. toctree:: :maxdepth: 1 :caption: Supplemental Science Guides geos-chem-shared-docs/supplemental-guides/science-guides.rst geos-chem-shared-docs/supplemental-guides/apm-guide.rst geos-chem-shared-docs/supplemental-guides/ate-guide.rst geos-chem-shared-docs/supplemental-guides/aerosols-guide.rst geos-chem-shared-docs/supplemental-guides/cloud-conv-guide.rst geos-chem-shared-docs/supplemental-guides/drydep-guide.rst geos-chem-shared-docs/supplemental-guides/pm25-pm10-guide.rst geos-chem-shared-docs/supplemental-guides/pbl-mixing-guide.rst geos-chem-shared-docs/supplemental-guides/photolysis-guide.rst geos-chem-shared-docs/supplemental-guides/phys-consts-guide.rst geos-chem-shared-docs/supplemental-guides/rrtmg-guide.rst .. toctree:: :caption: Supplemental Technical Guides :maxdepth: 1 supplement/technical-guides.rst supplement/horizontal-grids.rst supplement/vertical-grids.rst supplement/run-gchp-on-cloud.rst geos-chem-shared-docs/supplemental-guides/load-libraries-guide.rst geos-chem-shared-docs/supplemental-guides/spack-guide.rst supplement/caching-input-data.rst supplement/containers.rst supplement/stretched-grid.rst supplement/satellite-overpass.rst geos-chem-shared-docs/doc/gcid-portal-overview.rst geos-chem-shared-docs/supplemental-guides/bashdatacatalog.rst geos-chem-shared-docs/supplemental-guides/history-diag-guide.rst geos-chem-shared-docs/supplemental-guides/netcdf-guide.rst geos-chem-shared-docs/supplemental-guides/coards-guide.rst geos-chem-shared-docs/supplemental-guides/customize-guide.rst geos-chem-shared-docs/supplemental-guides/error-guide.rst geos-chem-shared-docs/supplemental-guides/debug-guide.rst geos-chem-shared-docs/supplemental-guides/species-guide.rst geos-chem-shared-docs/supplemental-guides/using-kpp-with-gc.rst geos-chem-shared-docs/supplemental-guides/using-kpp-standalone.rst geos-chem-shared-docs/supplemental-guides/related-docs.rst .. toctree:: :maxdepth: 1 :caption: Help & Reference reference/versioning.rst reference/known-bugs.rst reference/CONTRIBUTING.md reference/SUPPORT.md geos-chem-shared-docs/editing_these_docs.rst reference/git-submodules.rst reference/glossary.rst reference/uploading_to_spack.rst