Key concepts (Glossary)

Here is a list of concepts for WRF-GC that may be useful for using and developing WRF-GC.


The Weather Research and Forecasting Model, a mesoscale weather model. It provides the meteorology and framework for WRF-GC to work.


Atmospheric chemistry model that WRF-GC uses for chemistry. Not an acronym 1. Website

WRF-GC Model

An online, two-way coupling of WRF and GEOS-Chem into one model, using the WRF-GC Coupler. The two models do not run separately - WRF-GC runs through WRF and the coupler will run GEOS-Chem chemistry at the appropriate time steps. Running WRF-GC is very similar to running WRF-Chem.


The Harmonized Emissions Component, an on-line emissions component that WRF-GC uses for emissions. WRF-GC uses a modified version of HEMCO for coupling to WRF-GC and is described by Lin et al., 2021 2.


The WRF Pre-Processor, a tool to prepare the grid and input meteorological fields (initial and boundary conditions) for the WRF model.


A tool for inserting chemical initial and boundary conditions into WRF-Chem or WRF-GC’s input files. We document the usage in Chemical Initial/Boundary Conditions (IC/BC).



Cited from the GEOS-Chem narrative description: The name “GEOS-Chem” was coined in 2001 and is first referred to in Bey et al. [2001]. It is not an acronym - there is nothing to spell out. GEOS stands for Goddard Earth Observing System and Chem stands for Chemistry but calling it the “Goddard Earth Observing System - Chemistry” model would be inappropriate because the GEOS Earth System Model can use other chemical modules besides GEOS-Chem, and GEOS-Chem can use other meteorological drivers besides GEOS.


Lin, H., Jacob, D. J., Lundgren, E. W., Sulprizio, M. P., Keller, C. A., Fritz, T. M., Eastham, S. D., Emmons, L. K., Campbell, P. C., Baker, B., Saylor, R. D., and Montuoro, R.: Harmonized Emissions Component (HEMCO) 3.0 as a versatile emissions component for atmospheric models: application in the GEOS-Chem, NASA GEOS, WRF-GC, CESM2, NOAA GEFS-Aerosol, and NOAA UFS models, Geosci. Model Dev., 14, 5487–5506,, 2021.