Secondary aersosl concentration reach to infinity

Ravi Prakash Maurya ce23d031

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Jan 27, 2025, 12:50:23 AM1/27/25

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Dear All,

I am currently working on WRF-3.9.1. I am trying to simulate the Indian Himalayan region. I am running with following emissions datasets:

- Meteorological Forcing Data: ERA5 .
- Anthropogenic Emissions: EDGAR .
- Biogenic Emissions: MEGAN .
- Fire Emissions: FINN .
- Chemical Boundary Conditions: WACCM/CAM-Chem.

I am using chem_opt=202.

After the first time the chemistry module is called the secondary aerosol concentration reaches to infinity. I am attaching my namelist for perusal.

I would be very thankful if anyone could help on on this. Please let me know if I need to provide any additional information on this.

Kind regards,

Ravi

namelist.input

Gabriele Pfister

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Jan 27, 2025, 1:19:39 PM1/27/25

to ce23...@smail.iitm.ac.in, wrf-chem

Hi,

I only took a brief look through your nameslist and there are various settings you would want to revise.

E.g, you use phot_opt=1 but we strongly suggest using the latest TUV version (option 4). See our website for more information (https://www2.acom.ucar.edu/wrf-chem).

I also suggest going through your input files and making sure you have no negative emissions or other strange values in them.

A first helpful check is also to run without any chemistry and make sure that your met-only setup runs fine.

Gabi

--

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

Atmospheric Chemistry Observations & Modeling (ACOM) Lab

NSF National Center for Atmospheric Research (NCAR)

Email: pfi...@ucar.edu

Work Phone: +1 303 497 2915

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