Hi all,
My coupled model version is WRFv4.5-CMAQv5.4. And I try to remove sea spray aerosol emission in my running case. I would like to ask which module in the coupled model is responsible for the calculation of the flux and mass of SSA emission?
When I multiplied the number flux and volume flux in SSEMIS.F by 0 and recompiled it according to the previous test using unidirectional CMAQ model, I found that it did not work and there were still emission values in CCTM_SSEMIS file, such as variable “CLJ” in ocean region. It seems that SSEMIS does not work in the coupled model, even though it has been compiled and generated .o and .mod files.
Finally I set the SSA emission to 0 by modifying the file CMAQ_Control_DESID_cb6r5m_ae7_aq.nml. Can this modification completely eliminate SSA emissions? Because I notice that the concentration of SSA at sea in the CCTM_ACONC file is close to 0, while the CCTM_SSEMIS file still has the value of SSA emission flux.
If you are using the cb6r5m mechanism, you probably want the halogen chemistry, which is also turned off using the environment variable given above.
In that case, I would go back to the approach you were using with DESID. You should be able to create a rule to be applied EVERYWHERE for the SEASPRAY emissions stream for ALL species and ALL phases/modes with a scale factor of 1.0, a UNIT basis, and an Op code of 0.0.
The ‘native’ emissions diagnostic files are not affected by scaling factors applied via DESID. In other words, the SSEMIS files are unchanged if you use DESID to scale emissions by 2, 10, or 0. To see the emissions going into the model from a given stream, you need to create a DESID diagnostic file. See the &Desid_DiagVars and &Desid_Diag namelists in the DESID control file.
Thanks for your tips, I changed scale factor to 0.0 and kept Op code ‘a’. From the final output ACONC file, the sea salt emissions were indeed removed.
