Ozone simulation is zero

[Brillant]

I'm using WRFV4.5.1 for simulation, tried CBMZ, MOZART and SAPRC99 chemistry schemes but the ozone at night is all zero, I've made many attempts but none of them work, can anyone help me? The picture is the ozone simulation I ran and you can see that the ozone values are all zero from 11z to 23z each day.

[Gabriele Pfister]

Hi

not knowing what region you are simulating and what the timeseries is taken from (a single grid cell in an urban area, regional average,...) it is not possible to see whether something is wrong or not. Assuming your near-zero values (or are they exactly zero?) are at nighttime, it might be worthwhile checking the NOx values. Possible you have very strong titration happening? And also check what your boundary layer does at night. 

One other thing to check is to include emissions in your output files to ensure they are all read in. 

Gabi

On Tue, Jan 2, 2024 at 5:49 AM Brillant <l1150...@gmail.com> wrote:

I'm using WRFV4.5.1 for simulation, tried CBMZ, MOZART and SAPRC99 chemistry schemes but the ozone at night is all zero, I've made many attempts but none of them work, can anyone help me? The picture is the ozone simulation I ran and you can see that the ozone values are all zero from 11z to 23z each day.

--

================================
Gabriele Pfister

Atmospheric Chemistry Observations & Modeling (ACOM) Lab

NSF National Center for Atmospheric Research (NCAR)

Email: pfi...@ucar.edu

Temporary Home Office Phone: +1 303 241 1329

Work Phone: +1 303 497 2915

Web: https://staff.ucar.edu/users/pfister

[Brillant]

Thank you, I found the reason, it was that I forgot to divide the NOx by the molecular mass in the code that handles the anthro emissions, resulting in a high NOx value. After modifying it, everything is already working fine.

[Naser Mohammadzadeh]

Hi Brillant

I want to run WRF-chem with your chem_opt=198 option. Can you please tell me how you got anthropogenic emissions? Did you use the EDGAR-HTAP emission provided by NCAR (https://www.acom.ucar.edu/wrf-chem/download.shtml).

I would be glad if you could help me.

Thank you

Naser