# How to modify scale factor of emission in CMAQ-5.4-DESIC?

**URL:** <https://forum.cmascenter.org/t/how-to-modify-scale-factor-of-emission-in-cmaq-5-4-desic/4197>\
**Category:** Run Time Errors and Issues\
**Tags:** cmaq, emissions\
**Created:** [June 28, 2023, 11:37am UTC](https://forum.cmascenter.org/t/how-to-modify-scale-factor-of-emission-in-cmaq-5-4-desic/4197 "2023-06-28T11:37:11Z")\
**Posts on this page:** 7\
**Page:** 1

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**Author:** ![Hhhhhaofan](https://avatars.discourse-cdn.com/v4/letter/h/74df32/32.png) [@Hhhhhaofan](https://forum.cmascenter.org/u/Hhhhhaofan)\
**Post date:** [June 28, 2023, 11:37am UTC](https://forum.cmascenter.org/t/how-to-modify-scale-factor-of-emission-in-cmaq-5-4-desic/4197/1 "2023-06-28T11:37:11Z")

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Hi, everyone,

I want to scale emissions from one stream by a common factor, and I added a rule to the last line of `BLD_CCTM_v54_intel_cb6r5_ae7_aq/CMAQ_Control_DESID_cb6r5_ae7_aq.nml`.

```auto
! Scalling all the species of fine particular. Add by Haofan Wang.
! Region | Stream Label |Emission | CMAQ- |Phase/|Scale |Basis |Op
! Label | |Surrogate| Species |Mode |Factor| |
'EVERYWHERE' , 'AR' ,'All' ,'All' ,'ALL' ,30. ,'UNIT','m',

```

The `Stream Label` in my CCTM script can be seen in following code.

```auto
   #> Gridded Emissions Files
   setenv N_EMIS_GR 5
   set EMISfile = ${GRID_NAME}_${YYYYMMDD}_CB06_agriculture.nc
   setenv GR_EMIS_001 ${EMISpath}/${EMISfile}
   setenv GR_EMIS_LAB_001 AG
   setenv GR_EM_SYM_DATE_001 F # To change default behaviour please see Users Guide for EMIS_SYM_DATE

   set EMISfile = ${GRID_NAME}_${YYYYMMDD}_CB06_power.nc
   setenv GR_EMIS_002 ${EMISpath}/${EMISfile}
   setenv GR_EMIS_LAB_002 PP
   setenv GR_EM_SYM_DATE_002 F # To change default behaviour please see Users Guide for EMIS_SYM_DATE

   set EMISfile = ${GRID_NAME}_${YYYYMMDD}_CB06_residential.nc
   setenv GR_EMIS_003 ${EMISpath}/${EMISfile}
   setenv GR_EMIS_LAB_003 AR
   setenv GR_EM_SYM_DATE_003 F # To change default behaviour please see Users Guide for EMIS_SYM_DATE

   set EMISfile = ${GRID_NAME}_${YYYYMMDD}_CB06_transportation.nc
   setenv GR_EMIS_004 ${EMISpath}/${EMISfile}
   setenv GR_EMIS_LAB_004 TR
   setenv GR_EM_SYM_DATE_004 F # To change default behaviour please see Users Guide for EMIS_SYM_DATE

   set EMISfile = ${GRID_NAME}_${YYYYMMDD}_CB06_industry.nc
   setenv GR_EMIS_005 ${EMISpath}/${EMISfile}
   setenv GR_EMIS_LAB_005 IN
   setenv GR_EM_SYM_DATE_005 F # To change default behaviour please see Users Guide for EMIS_SYM_DATE

```

However, the PM2.5 concentration have no changed, and I think it’s because the changes in `CMAQ_Control_DESID_cb6r5_ae7_aq.nml` are not working properly.

**Note: The emissions in the AR contain particulate matter and do not all have a value of zero.**

I look forward to hearing from you.

Best regards,  
Haofan

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<div class="post-metadata">

**Author:** ![Ben\_Murphy](https://avatars.discourse-cdn.com/v4/letter/b/74df32/32.png) [@Ben\_Murphy](https://forum.cmascenter.org/u/Ben_Murphy)\
**Post date:** [June 28, 2023, 8:10pm UTC](https://forum.cmascenter.org/t/how-to-modify-scale-factor-of-emission-in-cmaq-5-4-desic/4197/2 "2023-06-28T20:10:47Z")

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Hello Haofan,

If possible, please attach one of the log files that begin with CTM\_LOG\_. In these files is a record of what DESID interpreted from the information it was provided.

Thanks,  
Ben Murphy

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<div class="post-metadata">

**Author:** ![Hhhhhaofan](https://avatars.discourse-cdn.com/v4/letter/h/74df32/32.png) [@Hhhhhaofan](https://forum.cmascenter.org/u/Hhhhhaofan)\
**Post date:** [June 30, 2023, 4:49am UTC](https://forum.cmascenter.org/t/how-to-modify-scale-factor-of-emission-in-cmaq-5-4-desic/4197/3 "2023-06-30T04:49:18Z")

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Hello Ben,

Thanks for your respond.  
This attachment is one of my `CTM_LOG_` file.

[CTM\_LOG\_000.v54\_intel\_10km\_20100110.txt](https://forum.cmascenter.org/uploads/short-url/r8r7SZOwk1y8eDEcfP87pNF2GmU.txt) (443.6 KB)

Thanks,  
Haofan

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<div class="post-metadata">

**Author:** ![Ben\_Murphy](https://avatars.discourse-cdn.com/v4/letter/b/74df32/32.png) [@Ben\_Murphy](https://forum.cmascenter.org/u/Ben_Murphy)\
**Post date:** [June 30, 2023, 2:01pm UTC](https://forum.cmascenter.org/t/how-to-modify-scale-factor-of-emission-in-cmaq-5-4-desic/4197/4 "2023-06-30T14:01:15Z")

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Thanks Haofan,

If you search for “Sector Label: AR” and see the lines that follow, there is evidence that DESID interpreted your instruction correctly and applied it to the emissions.

One thing you can do is output the Emissions diagnostic files for your base case and perturbed case to confirm that the emissions changed. I suspect they have. Is it possible that emissions from AR are smaller in magnitude than from other sources and so a 30x change is difficult to notice?

Cheers,  
Ben

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<div class="post-metadata">

**Author:** ![Hhhhhaofan](https://avatars.discourse-cdn.com/v4/letter/h/74df32/32.png) [@Hhhhhaofan](https://forum.cmascenter.org/u/Hhhhhaofan)\
**Post date:** [August 10, 2023, 7:22am UTC](https://forum.cmascenter.org/t/how-to-modify-scale-factor-of-emission-in-cmaq-5-4-desic/4197/5 "2023-08-10T07:22:54Z")

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Hello Ben,

I apologise for the delay in replying.

I have checked my CCTM output. This concentration have changed after the DESIC.nml changed. However, there is no significant changes in the CCTM output due to the emissions from AR are much smaller than from other source.

Thank you very much!

Best regards,  
Haofan

---

<div class="post-metadata">

**Author:** ![Ben\_Murphy](https://avatars.discourse-cdn.com/v4/letter/b/74df32/32.png) [@Ben\_Murphy](https://forum.cmascenter.org/u/Ben_Murphy)\
**Post date:** [September 1, 2023, 8:51pm UTC](https://forum.cmascenter.org/t/how-to-modify-scale-factor-of-emission-in-cmaq-5-4-desic/4197/6 "2023-09-01T20:51:12Z")

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Thanks for your reply Haofan,

So do I understand correctly that this issue is resolved?

Best wishes,  
Ben

---

<div class="post-metadata">

**Author:** ![Hhhhhaofan](https://avatars.discourse-cdn.com/v4/letter/h/74df32/32.png) [@Hhhhhaofan](https://forum.cmascenter.org/u/Hhhhhaofan)\
**Post date:** [September 2, 2023, 8:00am UTC](https://forum.cmascenter.org/t/how-to-modify-scale-factor-of-emission-in-cmaq-5-4-desic/4197/7 "2023-09-02T08:00:55Z")

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Hi, Ben.

Thanks for your help. Yes, this issue have resolved.

Best regards,  
Haofan