# Wet deposition scheme: CMAQ 5.0.2 vs CMAQ 5.3.2

**URL:** <https://forum.cmascenter.org/t/wet-deposition-scheme-cmaq-5-0-2-vs-cmaq-5-3-2/3141>\
**Category:** CMAQ\
**Created:** [March 24, 2022, 2:21pm UTC](https://forum.cmascenter.org/t/wet-deposition-scheme-cmaq-5-0-2-vs-cmaq-5-3-2/3141 "2022-03-24T14:21:42Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![lwu127](https://avatars.discourse-cdn.com/v4/letter/l/ea666f/32.png) [@lwu127](https://forum.cmascenter.org/u/lwu127)\
**Post date:** [March 24, 2022, 2:21pm UTC](https://forum.cmascenter.org/t/wet-deposition-scheme-cmaq-5-0-2-vs-cmaq-5-3-2/3141/1 "2022-03-24T14:21:42Z")

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Hi everyone,

I wonder if anyone know the wet deposition calculation difference between CMAQ-5.0 and CMAQ-5.3. I did a same simulation using same input files using CMAQ5.3.2 and compared that with 5.0.2 and found large difference in wet deposition of a PM species(100000\*APHGJ).  
The following results is at one site of a day. The left is 5.0.2 and the right is 5.3.2. 5.0.2’s wet deposition is much larger than 5.3.2.  
By the way, i run the benchmark before and my wet deposition simulation is very close to the standard output. Part of my run script is also shown below.

Any related thoughts are appreciated!!!

 ![Picture1](https://canada1.discourse-cdn.com/flex027/uploads/cmas/original/2X/9/93c2e59134f4eaeba73276bc6fe9c9fab9afa7af.jpeg)  
 ![2022-03-24 (7)](https://canada1.discourse-cdn.com/flex027/uploads/cmas/original/2X/2/2c9b3b512e767e553d71cbe4ba534e779cb79614.png)  
Thanks!  
Lin

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**Author:** ![lizadams](https://avatars.discourse-cdn.com/v4/letter/l/49beb7/32.png) [@lizadams](https://forum.cmascenter.org/u/lizadams)\
**Post date:** [June 7, 2022, 3:46pm UTC](https://forum.cmascenter.org/t/wet-deposition-scheme-cmaq-5-0-2-vs-cmaq-5-3-2/3141/2 "2022-06-07T15:46:47Z")

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Were you able to identify why CMAQ has different wet deposition values for a PM species or do you still need assistance?