# Encountered Issues in Preparing MPAS-CMAQ Input Files

**URL:** https://forum.cmascenter.org/t/encountered-issues-in-preparing-mpas-cmaq-input-files/5657
**Category:** MPAS-CMAQ
**Created:** [March 10, 2025, 1:59pm UTC](https://forum.cmascenter.org/t/encountered-issues-in-preparing-mpas-cmaq-input-files/5657 "2025-03-10T13:59:28Z")
**Posts on this page:** 3
**Page:** 1

<div class="post-metadata">

### Author: ![penguin](https://avatars.discourse-cdn.com/v4/letter/p/e480ec/32.png) [@penguin](https://forum.cmascenter.org/u/penguin)
#### Post date: [March 10, 2025, 1:59pm UTC](https://forum.cmascenter.org/t/encountered-issues-in-preparing-mpas-cmaq-input-files/5657/1 "2025-03-10T13:59:28Z")

</div>

Hello!

I am currently trying to run the MPAS-CMAQ model, and recently, I attempted to create the soil nudging file mentioned in the test file. I understand that this file supports the PX LSM. In WRF, the OBSGRID is typically used to generate this file, but I couldn’t find a similar feature in the MPAS documentation. Also, when I used the `ncdump -h` command to examine the `x1.40962.soilndg.2017.nc` file from the test file, I found that it is generated by MPAS’s `init_atmosphere`, and this version of MPAS appears to be modified by USEPA but not publicly available. So, how can I generate this file? Should I use WRF’s OBSGRID to create the file and then interpolate it to MPAS, or can I use the standard `init_atmosphere` to generate it?

 ![图片](https://canada1.discourse-cdn.com/flex027/uploads/cmas/original/2X/4/47aacefdf2635ab3a382290ef73c4cf23f265af9.png)  
I am looking forward to your response.

Sincerely,  
Pan.

---

<div class="post-metadata">

### Author: ![lizadams](https://avatars.discourse-cdn.com/v4/letter/l/49beb7/32.png) [@lizadams](https://forum.cmascenter.org/u/lizadams)
#### Post date: [March 30, 2025, 7:39pm UTC](https://forum.cmascenter.org/t/encountered-issues-in-preparing-mpas-cmaq-input-files/5657/2 "2025-03-30T19:39:57Z")

</div>

Currently, we are unable to provide support for the generation of input files for MPAS-CMAQ. EPA’s release of the current version of MPAS-CMAQ allows our community to learn how to use and run MPAS-CMAQ using the provided benchmark.

---

<div class="post-metadata">

### Author: ![penguin](https://avatars.discourse-cdn.com/v4/letter/p/e480ec/32.png) [@penguin](https://forum.cmascenter.org/u/penguin)
#### Post date: [March 31, 2025, 2:05am UTC](https://forum.cmascenter.org/t/encountered-issues-in-preparing-mpas-cmaq-input-files/5657/3 "2025-03-31T02:05:21Z")

</div>

Hello,

Thank you for your response!

Wish you all the best.