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confusion about CO2 simulation using wrf-ghg

Cheng He

New member
Hello, professors.
I am a user of the WRF-CHEM model. I have a question to consult you about using the chemistry option (chem_opt=16) to simulate CO2 transport process. When I add emission at a specific grid point,the model results show some grids concentration decrease irregularly, and this negative growth gradually spreads outwards from around the grid where emissions increase. Whether is it wrong? and I can not explain the phenomenon. So I want to ask for your help.

Looking forward to your reply,thank you very much!