Help cam variables namelist - aerosols

[jyx]

I have the following questions：

• I found the list of atmospheric variables in the case I ran in the atm_in file, but I don't know where to look up the specific meaning of these variables, such as: bc_a1, bc_a4.
  
  • This is the original atm_in file: aer_drydep_list = 'bc_a1', 'bc_a4', 'dst_a1', 'dst_a2', 'dst_a3', 'ncl_a1', 'ncl_a2', 'ncl_a3', 'num_a1', 'num_a2', 'num_a3', 'num_a4', 'pom_a1', 'pom_a4', 'so4_a1', 'so4_a2', 'so4_a3', 'soa1_a1', 'soa1_a2', 'soa2_a1', 'soa2_a2', 'soa3_a1', 'soa3_a2', 'soa4_a1', 'soa4_a2', 'soa5_a1', 'soa5_a2'
• I found that the document also mentioned four models for aerosol calculation（'mam4_mode1:accum:='；mam4_mode2:aitken:=；'mam4_mode3:coarse:='，'mam4_mode4:primary_carbon:='）. I also want to know what its definition is, how it works, and how it is calculated.
• Finally: I am a researcher studying the optical properties of black carbon particles. I would like to do some experiments in CESM to improve the calculation of black carbon particles. I wonder if you have any suggestions so that I can fully and accurately understand how the calculation of aerosols (black carbon) is run in CAM, mainly involving AOD and AAOD related values.

I searched for relevant information on the official website. When I clicked on the namelist website mentioned in CAM, I found that it could not be opened.

Thank you very much for your review, looking forward to your reply！

 

[hplin]

Thanks for writing. This is regarding aerosol variables so I am moving it to the CAM-chem forum for further assistance.
You may also find this useful: Black Carbon concentration in CAM6

For the meaning of bc (black carbon), ncl (sea salt), ... please refer to the "Aerosols" section here. https://www2.acom.ucar.edu/sites/default/files/documents/Species_CESM2-WACCM.pdf

 

[rrbuchholz]

Hi Jyx,

Please take a look at our Chemistry modeling Wiki Page:

Home - CAM-Chem - wiki.ucar.edu

wiki.ucar.edu

On that page you will find a link to the Chemistry manuscript:​

Emmons et al, 2020: https://doi.org/10.1029/2019MS001882​

​

and the aerosol manuscript.​

Tilmes et al, 2019: https://doi.org/10.1029/2019MS001827​

The supplement of the chemistry manuscript includes a list of species with descriptions. FYI Haipeng linked the supplement doc in the above response.

Please look through the Wiki page and the User and Scientific Guides, and let us know if you have any other more specific questions about BC.

Welcome to the CAM documentation — camdoc documentation

Best
Rebecca

 

[jyx]

Hi Jyx,

Please take a look at our Chemistry modeling Wiki Page:

Home - CAM-Chem - wiki.ucar.edu

wiki.ucar.edu

On that page you will find a link to the Chemistry manuscript:​

Emmons et al, 2020: https://doi.org/10.1029/2019MS001882​

​

and the aerosol manuscript.​

Tilmes et al, 2019: https://doi.org/10.1029/2019MS001827​

The supplement of the chemistry manuscript includes a list of species with descriptions. FYI Haipeng linked the supplement doc in the above response.

Please look through the Wiki page and the User and Scientific Guides, and let us know if you have any other more specific questions about BC.

Welcome to the CAM documentation — camdoc documentation

Best
Rebecca

Thank you very much for your reply！
I have other questions:

• If I want to understand the changes in atmospheric black carbon particles under the background of fire, which case should I use?Is it FHIST or B1850 or do you have a better choice?Because the values of bc_a1 and bc_a4 calculated in the FCfireHIST case are all 0. I am very confused about this.
• How do I know which chemical model my cam component uses? I can't find this case, can you tell me where to look?