Need Help Running WRF-Chem

[Akhtar Memon]

Dear Gabriele,

I want to study the source apportionment of PM2.5. I am currently using EDGAR for Anthro emissions, MEGAN for bio and FINN for fire. I am using MOZCART-MOSAIC (8bins) for IC/BC (for the purpose I am using mozbc) using CESM data . Results are underestimated with ground observations. I am attaching files. Kindly suggest.

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Regards

Akhtar Ali Memon

Cell # : +923322788727

[Gabriele Pfister]

Hello Akhtar

unfortunately we cannot help you with the scientific analysis of your simulations and only can try to help if you experience technical issues when using any of our developed schemes or tools. 

Only taking a quick look at your namelist, it seems you are running for multiple weeks but are not using any grid or analysis nudging. This means that your meteorology will likely drift and not represent the true conditions. I suggest carefully evaluating the meteorological performance of your runs and consider using one of the nudging techniques or reinitializing the meteorology at regular intervals. 

Best of luck

Gabi

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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

[Akhtar Memon]

Dear Gabi,

What do you suggest how long the simulation can I run to avoid nudging or reinitializing met? Is it ok to run DJF season of 2022-23 in parts (you would suggest)?

Sent from my iPhone

On 02-Oct-2025, at 6:52 PM, Gabriele Pfister <pfi...@ucar.edu> wrote:



[Gabriele Pfister]

Hi 

this is really a question that is best directed to the WRF/MPAS Forum. But basically it depends on how quickly your WRF run deviates from, e.g. a reanalysis and this depends on the region and time period you are modeling. That can happen within a few days or less. 

Gabi