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<h1 id="page-title" ng-non-bindable="">Overview</h1>
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<p align="justify">
GEOS-Chem enables simulations of atmospheric composition on
local to global scales. It can be used off-line as a 3-D
chemical transport model driven by assimilated meteorological
observations from the Goddard Earth Observing System (GEOS) of
the NASA <a href="http://gmao.gsfc.nasa.gov/"
target="_blank">Global Modeling Assimilation Office
(GMAO)</a>. It can also be used on-line as a chemical module
coupled to weather and climate models. GEOS-Chem is developed
and used by <a href="users.html">hundreds of research groups worldwide </a>as a
versatile tool for application to a wide range of atmospheric
composition problems. It is open-access and can be downloaded
through github. It is also fully supported for use on the
Amazon Web Services cloud.
</p>
<p align="justify">
The off-line version of GEOS-Chem allows immediate simulations
of atmospheric composition for any period from 1979 to present
using the continuous global archive of NASA GEOS data packaged
with GEOS-Chem. The operational GEOS-Forward Processing
product (<a href="https://wiki.seas.harvard.edu/geos-chem/index.php/GEOS-FP"
target="_blank">GEOS-FP</a>) for 2012-present has a horizontal
resolution of 0.25° latitude x 0.3125° longitude with 72
vertical levels. The
<a href="https://wiki.seas.harvard.edu/geos-chem/index.php/MERRA-2"
target="_blank">MERRA-2</a> reanalysis product for
1979-present has a horizontal resolution of 0.5° latitude x
0.625° longitude, again with 72 vertical levels. Off-line
simulations can be conducted with OpenMP shared-memory
parallelization (GEOS-Chem Classic, called GC-Classic) or with
MPI distributed-memory parallelization
(<a href="https://gchp.readthedocs.io" target="_blank">GEOS-Chem
high-performance, called GCHP</a>). GC-Classic operates on a
rectilinear grid and GCHP operates on a cubed-sphere grid. GEOS-Chem
simulations can be conducted globally at the native grid resolution or
at user-selected lower resolution. They can also be conducted
over user-selected regions with dynamic boundary conditions
(nested mode) or in stretched-grid mode with zoom over a
region of interest.
</p>
<p>
On-line applications of GEOS-Chem use the stand-alone
GEOS-Chem chemical module that performs chemistry, aerosol
microphysics, radiation, emissions, and deposition on 1-D
atmospheric columns for any grid specified at run time. In
on-line applications, chemical transport is performed by a
weather or climate model coupled to GEOS-Chem. The emission
component of GEOS-Chem
(<a href="https://hemco.readthedocs.io" target="_blank">HEMCO</a>)
can also be used independently of the rest of GEOS-Chem or as a
generalized data broker in the weather/climate model. GEOS-Chem has in
this manner been coupled with the NASA GEOS Earth System Model (ESM),
the WRF weather model, the Beijing Climate Center ESM, and the NCAR
CESM.
</p>
<p align="justify">
All
<a href="https://wiki.seas.harvard.edu/geos-chem/index.php/GEOS-Chem_versions"
target="_blank">versions of the GEOS-Chem
model </a>use the same standard code maintained by
the <a href="support-team.html" target="_blank">GEOS-Chem
Support Team</a>. Updated versions of this standard code are
released regularly. Detailed GEOS-Chem on-line documentation
is available including
a <a href="https://geos-chem.readthedocs.io/en/stable/geos-chem-shared-docs/supplemental-guides/related-docs.html"
target="_blank">User's Guide</a>. The code is fully modular
and highly parallelized. It is presently being used on several types
of
<a href="https://geos-chem.readthedocs.io/en/latest/getting-started/system-req-hard.html"
target="_blank">Linux-like computing platforms</a> running Ubuntu,
Fedora, Red Hat, Rocky Linux, Alma Linux, Amazon Linux, MacOS, and
similar operating systems. It supports Intel Fortran and the
open-source GNU Fortran compilers.
</p>
<p align="justify">
An adjoint of the GEOS-Chem model is maintained by the
GEOS-Chem community under the direction
of <a href="http://spot.colorado.edu/~henzed"
target="_blank">Adjoint Model Scientist Daven Henze</a> for
inverse modeling, data assimilation, and sensitivity studies. See the
<a href="https://wiki.seas.harvard.edu/geos-chem/index.php/GEOS-Chem_Adjoint"
target="_blank">GEOS-Chem Adjoint web site</a> for more details.
</p>
<p align="justify">
Several
<a href="https://wiki.seas.harvard.edu/geos-chem/index.php/Software_maintained_by_GEOS-Chem_community_members"
target="blank">software tools</a>
facilitate the processing of GEOS-Chem model outputs. This
includes <a href="https://gcpy.readthedocs.io"
target="_blank">GCPy</a>, a package of free and open-source Python
tools specifically designed for GEOS-Chem output analysis and
visualization.
</p>
<p align="justify">
GEOS-Chem is a freely accessible community model. It is owned
and supported by its <a href="users.html">user
community</a> under the purview
of <a href="working-groups.html">Working Groups</a>
and an international <a href="steering-committee.html">Steering Committee</a>. User participation,
responsibility, and feedback are essential. See
our <a href="welcome.html">welcome page for new
users</a>. The model is maintained as a robust
state-of-the-science facility by combining a nimble
grass-roots approach to code development with strong version
control. All development is done by users in support of their
own research needs and then shared with the community. General
management of GEOS-Chem is supported by the US NASA Earth
Science Division, the Canadian National Science and
Engineering Research Council, and the Nanjing University of
Information Sciences and Technology.
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