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(Preparing GEOS-Chem shared data directories)
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==Preparing GEOS-Chem shared data directories==
 
==Preparing GEOS-Chem shared data directories==
  
The GEOS-Chem shared data directories contain many large files necessary for the WRF-GC. Please Set up the top-level root directory for GEOS-Chem shared data, which is called ExtData.
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The GEOS-Chem shared data directories contain many large files necessary for the WRF-GC. Please Set up the top-level root directory for GEOS-Chem shared data, which is called ExtData. Please create the '''/dir/to/data/ExtData''' and Setting your directories in the input.geos file:
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•      Root data directory : /dir/to/data/ExtData
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The ExtData directory structure cotains two subdirectories:
 
The ExtData directory structure cotains two subdirectories:
 +
  
 
- CHEM_INPUT: Non-emissions data for GEOS-Chem chemistry modules
 
- CHEM_INPUT: Non-emissions data for GEOS-Chem chemistry modules
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- HEMCO: Emissions inventories for the HEMCO emissions component
 
- HEMCO: Emissions inventories for the HEMCO emissions component
  
:
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==Emissions for WRF-GC==
 
==Emissions for WRF-GC==

Revision as of 20:07, 24 December 2018

Running WRF-GC is similar to WRF-Chem.


Contents

Running the WPS

Running the WRF Preprocessing System (WPS) is to prepare input to drive WRF. Please refer to the WRF User's Guide for more detail:

http://www2.mmm.ucar.edu/wrf/users/docs/user_guide_V3.9/users_guide_chap3.html


- Step 1: Define model domains with geogrid

In the "geogrid" namelist record, the projection of the simulation domain is defined. Only two possible map projections and parameters are supported in WRF-GC:
• Mercator /'mercator' (truelat1)
• Unrotated regular latitude-longitude /'lat-lon' (pole_lat, pole_lon, stand_lon)


- Step 2: Extracting meteorological data from GRIB files with ungrib

Downloading meteorological data for the real data case
http://www2.mmm.ucar.edu/wrf/users/download/free_data.html).


- Step 3: Horizontally interpolating meteorological data with metgrid


Preparing GEOS-Chem shared data directories

The GEOS-Chem shared data directories contain many large files necessary for the WRF-GC. Please Set up the top-level root directory for GEOS-Chem shared data, which is called ExtData. Please create the /dir/to/data/ExtData and Setting your directories in the input.geos file:

• Root data directory : /dir/to/data/ExtData

The ExtData directory structure cotains two subdirectories:


- CHEM_INPUT: Non-emissions data for GEOS-Chem chemistry modules


- HEMCO: Emissions inventories for the HEMCO emissions component


Emissions for WRF-GC

Preparing emission files is not requied. WRF-GC uses Harvard-NASA Emissions Component (HEMCO) with on-line regridding. For information on obtaining HEMCO data directories, please refer to the GEOS-Chem wiki:

http://wiki.seas.harvard.edu/geoschem/index.php/HEMCO_data_directories
Note: The location of HEMCO data directory needs to be specified in "input.geos" and "HEMCO_Config.rc"

Preparing chemical boundary condition data using global GEOS-Chem outputs