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# Global attributes
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Some CTM need that the emissions NetCDF follows their own conventions.
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HERMESv3_GR can provide outputs for MONARCH, CMAQ and WRF-Chem CTM but only CMAQ and WRF-Chem needs that global attributes file to accomplish their conventions
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## CMAQ global attributes
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Choosing CMAQ in the _output_model_ parameter of the [domain selection section of the configuration file](../user_guide/user_guide_section_domain) the output provided by HERMESv3_GR will follow the [IOAPIv3.1 conventions](https://www.cmascenter.org/ioapi/documentation/all_versions/html/).
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The majority of the global attributes needed are automatically set, but VGLVLS have to appear in the global attributes files; if not that value will be filled using the default configuration:
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```text
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VGLVLS = 1., 0.
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```
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## WRF-Chem global attributes
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Choosing WRF_CHEM in the _output_model_ parameter of the [domain selection section of the configuration file](../user_guide/user_guide_section_domain) the output provided by HERMESv3_GR will follow the WRF-Chem conventions.
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Some of the global attributes needed are automatically set. The following parameters of the global attributes files are the default options if them are not in that file:
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```text
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attribute,value
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BOTTOM-TOP_GRID_DIMENSION,45
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GRIDTYPE,C
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DIFF_OPT,1
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KM_OPT,4
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DAMP_OPT,3
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DAMPCOEF,0.2
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KHDIF,0.
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KVDIF,0.
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MP_PHYSICS,6
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RA_LW_PHYSICS,4
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RA_SW_PHYSICS,4
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SF_SFCLAY_PHYSICS,2
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SF_SURFACE_PHYSICS,2
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BL_PBL_PHYSICS,8
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CU_PHYSICS,0
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SF_LAKE_PHYSICS,0
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SURFACE_INPUT_SOURCE,1
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SST_UPDATE,0
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GRID_FDDA,0
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GFDDA_INTERVAL_M,0
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GFDDA_END_H,0
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GRID_SFDDA,0
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SGFDDA_INTERVAL_M,0
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SGFDDA_END_H,0
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BOTTOM-TOP_PATCH_START_UNSTAG,1
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BOTTOM-TOP_PATCH_END_UNSTAG,44
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BOTTOM-TOP_PATCH_START_STAG,1
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BOTTOM-TOP_PATCH_END_STAG,45
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GRID_ID,1
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PARENT_ID,0
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I_PARENT_START,1
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J_PARENT_START,1
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PARENT_GRID_RATIO,1
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DT,18.
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MMINLU,MODIFIED_IGBP_MODIS_NOAH
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NUM_LAND_CAT,41
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ISWATER,17
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ISLAKE,-1
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ISICE,15
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ISURBAN,13
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ISOILWATER,14
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```
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[Go to home wiki page](home) |
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\ No newline at end of file |