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How to modify the emission inventory? #2520
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Thanks for writing @ChenBHXMU. You shouldn't have to modify the source file to change emissions. WIth HEMCO you can define a scale factor of 0.5 that can be applied to emission entries. Please see our documentation at hemco.readthedocs.io for more information: |
Dear @yantosca Thank you for your help. I have read the contents. The HEMCO file contains many types of emissions. The information provided by this URL offers emission data from GFED. However, I still don't know how to modify the scale of anthropogenic emissions, such as the scale of anthropogenic NOx or NH3 emissions. Thank you! Best regards |
@ChenBHXMU: Try something like this: ###############################################################################
### BEGIN SECTION BASE EMISSIONS
###############################################################################
# ExtNr Name sourceFile sourceVar sourceTime C/R/E SrcDim SrcUnit Species ScalIDs Cat Hier
MY_EMISSION_NH3 /path/to/netcdf/file NH3 1980-2024/1-12/1/0 C xy kg/m2/s NH3 500 1 1
### END SECTION BASE EMISSIONS ###
###############################################################################
### BEGIN SECTION SCALE FACTORS
###############################################################################
# ScalID Name srcFile srcVar srcTime CRE Dim Unit Oper
500 ONE_HALF 0.5 - - - 1 1
### END SECTION SCALE FACTORS ### You can adapt this to your |
Dear @yantosca Thank you for your help! But I have other question. This scaleID corresponds to multiple locations and different values (e.g., 0.748/0.898); how should I handle this? Best regards |
Thanks @ChenBHXMU. As explained in the ReadTheDocs, a scale factor with 24 values is interpreted as hourly, and a scale factor with 31 values is interpereted as daily. We would recommend reading the documentation thoroughly if you haven't yet already. |
Thank you for your patience. |
Your name
Baihua Chen
Your affiliation
Xiamen University
Please provide a clear and concise description of your question or discussion topic.
Dear @yantosca
I hope this letter finds you well.
I have modified the file ExtData/HEMCO/NH3/v2019-08/NH3_geos.2x25.nc, reducing its concentration by half. The model covers the time period from July to November 2019. However, when I compared the files in the output, the concentration in SpeciesConcVV_NH3 did not change compared to the output concentration under the normal emission inventory. I am not sure where I made a mistake.
Best regards
Baihua Chen
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