WACCM6-MAM4 - difference between dst_a1 versus dst_c1, pom_c1 versus pom_a1, etc.

[nstant]

Hello!

I am looking for clarification between the different modes in MAM4.

I have the outputs of dst_c1 and dst_a1. What is the difference between c1 and a1?

I understand that a1, a2, a3, a4 --> Accumulation, Aitken, Coarse, Primary carbon.

Also if you can point me to any publications that verify this information, that would be very much appreciated.

Thank you

Sincerely,

Noah Stanton

 

[mmills]

dst_c1 is the mass mixing ratio of dust in the accumulation mode that is in cloud water. The long names for the variables are listed in the MASTER FIELD LIST that is printed out to the atm.log file every time the model is run, e.g.:

4942 dst_c1                           kg/kg              88 A  dst_c1 in cloud water

5032 pom_c1                           kg/kg              88 A  pom_c1 in cloud water

 

[mmills]

Here is the reference paper for MAM4:

Liu, X. et al. (2016), Description and evaluation of a new four-mode version of the Modal Aerosol Module (MAM4) within version 5.3 of the Community Atmosphere Model. Geoscientific Model Development Discussions 9, 505–522, doi:10.5194/gmd-9-505-2016.

https://gmd.copernicus.org/articles/9/505/2016/

 

[nstant]

Thank you for the information!

 

[nstant]

dst_c1 is the mass mixing ratio of dust in the accumulation mode that is in cloud water. The long names for the variables are listed in the MASTER FIELD LIST that is printed out to the atm.log file every time the model is run, e.g.:

4942 dst_c1                           kg/kg              88 A  dst_c1 in cloud water

5032 pom_c1                           kg/kg              88 A  pom_c1 in cloud water

Just one more clarification about c1 versus a1 for aerosols in general.

Would a1 include the contribution from c1, or are c1 and a1 quantities separate?

So let's say I'd like to find the sum of all accumulation mode dust aerosols:

Would I sum (dst_a1 + dst_c1) or just use dst_a1?

Thanks!

 

[mmills]

My understanding is that you would sum up dst_a1 and dst_c1.