# About adjoint forcing file (CMAQv5.0-adjoint model)

**URL:** <https://forum.cmascenter.org/t/about-adjoint-forcing-file-cmaqv5-0-adjoint-model/2590>\
**Category:** CMAQ-Adjoint\
**Tags:** cmaq\
**Created:** [August 18, 2021, 4:41am UTC](https://forum.cmascenter.org/t/about-adjoint-forcing-file-cmaqv5-0-adjoint-model/2590 "2021-08-18T04:41:10Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![power9x9x9](https://avatars.discourse-cdn.com/v4/letter/p/b2d939/32.png) [@power9x9x9](https://forum.cmascenter.org/u/power9x9x9)\
**Post date:** [August 18, 2021, 4:41am UTC](https://forum.cmascenter.org/t/about-adjoint-forcing-file-cmaqv5-0-adjoint-model/2590/1 "2021-08-18T04:41:10Z")

</div>

Hello,  
I am researching on a study related to inverse modeling using cmaq adjoint model(v5.0, [https://gmd.copernicus.org/articles/13/2925/2020/gmd-13-2925-2020.pdf](https://gmd.copernicus.org/articles/13/2925/2020/gmd-13-2925-2020.pdf)).

So, I downloaded a source code at Zenodo website([[CMAQ 5.0 Adjoint | Zenodo](https://zenodo.org/record/3780216#.X6ucVsgzZjU)]).

I compiled the adjoint models code.

Then I tried to execute backward model, but it did not work because that is not exist about adjoint forcing file.

**Q) How can i define adjoint forcing file?**

Best regards,

Jeonghyeok Mun

---

<div class="post-metadata">

**Author:** ![Xin](https://avatars.discourse-cdn.com/v4/letter/x/bbce88/32.png) [@Xin](https://forum.cmascenter.org/u/Xin)\
**Post date:** [February 28, 2023, 9:14am UTC](https://forum.cmascenter.org/t/about-adjoint-forcing-file-cmaqv5-0-adjoint-model/2590/2 "2023-02-28T09:14:24Z")

</div>

Hello  
I have encountered the same problem. Do you know how to make forcing files now？  
Best regards  
Xin