GEOS-Chem in CESM
Contents
Overview
This page serves as a resource for using GEOS-Chem in the Community Earth System Model (CESM). It is meant to supplement not replace existing CESM documentation and therefore includes a guide to navigating CESM resources maintained by NCAR. The rest of the page focuses on aspects of the model specific to GEOS-Chem. It is written primarily to help offline GEOS-Chem users get started with CESM. CESM users interested in using GEOS-Chem chemistry may also find it useful but should additional checkout GEOS-Chem documentation detailed on the GEOS-Chem wiki main page.
Citable references
CESM Resources
Model documentation
The best way to successfully use GEOS-Chem chemistry in CESM is to become familiar with CESM documentation and guides maintained by NCAR. The CESM2 Quickstart Guide contains an overview of the model and instructions for downloading, building, and running CESM2. CESM2 is built upon a framework called Common Infrastructure for Modeling the Earth (CIME, pronounced "SEAM") which handles configuring, compiling, testing, and running the model. Offline GEOS-Chem users can think of CIME as run directory management and testing, containing the equivalent of what is found in the 'run' and 'test' directories within GEOS-Chem. Read through the CIME documentation to become familiar with the concepts of CIME and to get detailed instructions for creating run directories, configuring a run, building the source code, and running the model. Community Atmosphere Model (CAM) is the atmospheric component of CESM and includes both GEOS-Chem and HEMCO as subcomponents. The CAM6.3 documentation builds upon information in the CESM Quickstart Guide and the CIME documentation. Read through it to learn about the atmospheric component's configuration options, data inputs, and model outputs.
Model websites
NCAR maintains several websites with up-to-date information about CESM. The CAM website and CESM with Chemistry Wiki page are of particular interest to GEOS-Chem users.
Data visualization and analysis
See the NCAR Python Resources for Chemistry Modeling for jupyter notebook examples of visualizing and analyzing CESM output data. Examples for atmospheric chemistry modeling with CAM-Chem are also relevant for modeling with GEOS-Chem.
Getting help
CESM help requests are handled on a searchable forum maintained by NCAR. Consider registering for a free account if you plan to use CESM.
